Nuestros investigadores

Rafael Miranda Ferreiro

Departamento
Biología Ambiental
Facultad de Ciencias. Universidad de Navarra
Líneas de investigación
Freshwater Fishes, Hydrobiology, Limnology, Animal Ecology, Management and Conservation of Wildlife, Conservation Biology, Biological Invasions
Índice H
13, (WoS, 07/12/2018)
14, (Scopus, 07/12/2018)
18, (Google Scholar, 07/12/2018)

Publicaciones científicas más recientes (desde 2010)

Autores: D.; Rodeles, A. A.; et al.
Revista: WATER
ISSN 2073-4441  Vol. 11  Nº 3  2019  págs. 1 - 17
The signal crayfish Pacifastacus leniusculus Dana, 1852 is a successful invasive species in the Iberian Peninsula. This is of particular conservation concern, as fish fauna is highly endemic and also threatened within this ecoregion. The aim of this study was to analyze behavioral interactions and trophic overlap between signal crayfish and native fishes in Iberian rivers (northern Spain). Video cameras were used to record fish "dominance/evasion" after spatial encounters with crayfish. Diet composition and isotopic signatures (¿13C and ¿15N) were compared to evaluate the niche overlap. Fish were dominant in 25% of the encounters with juvenile crayfish, whereas this percentage was only 4% with adult crayfish. Observations showed a high fish "evasion" response for Pyrenean stone loach Barbatula quignardi (B¿cescu-Me¿ter, 1967) (>30%). Dietary results showed a high trophic overlap between signal crayfish with the pelagic Pyrenean minnow Phoxinus bigerri Kottelat, 2007 and the benthic loach. However, the isotopic niche overlap was low, with brown trout Salmo trutta L., 1758 showing the highest area (only 0.1 ¿2). Overall, our findings suggest that interferences may occur with native species for food (i.e., benthic invertebrates). Consequently, measures should be applied to control invasive crayfish in Iberian rivers.
Autores: Martín-Gómez, César; Zuazua-Ros, A.; Bermejo-Busto, J.; et al.
Revista: FRONTIERS OF ARCHITECTURAL RESEARCH
ISSN 2095-2635  Vol. 8  Nº 1  2019  págs. 17 - 31
The strategies for thermal regulation and environmental control found in nature are countless. In this article, a parallelism between animals and building energy systems is defined in order to identify and emphasize the immediate opportunities that biomimicry offers for future research. The motivation was the need to find alternative solutions to tackle problems mainly in the efficiency of heating, ventilation and cooling systems. Due to the wide range of possibilities offered by animals, this study is largely limited to the strategies that cold-blooded animals have developed through evolutionary adaptation to the environment. The method used for the analysis is based on a solution-based approach. Firstly, different animal thermoregulation strategies are defined (biological domain). Then the strategy is analyzed and classified into three categories. This classification is essential in order to formulate the parallelism with building systems (transfer phase). The final step is to identify the potential implementation (technological domain). This approach has been seen to be useful in creating new research opportunities based on biomimicry. In addition, suitable solutions arising from multidisciplinary team research are presented as promising answers to the challenges that building energy systems face nowadays.
Autores: Ariño, A.H.; Miranda, Rafael;
Revista: BIODIVERSITY INFORMATION SCIENCE AND STANDARDS
ISSN 2535¿0897  Vol. 3  Nº e37077  2019  págs. 1 - 3
Critical as they are for humans and nature, freshwater ecosystems are threatened-but the extent and depth of these threats are not well understood, especially if essential biodiversity data are lacking. Any policy aimed at protecting such ecosystems must first assess the threat factors and the potential harm, well before proposing conservation measures such as the creation and development of Protected Areas (PAs). These assessments must be done using a deep and sound knowledge of the actual and potential biodiversity variables. Freshwater ecosystems have been largely neglected in traditional PA design and management (Abell et al. 2007), be it for scarcity of biodiversity data, or for more perception-related reasons such as visibility and accessibility driving the allocation of conservation resources to more data-rich environments.
Autores: Galicia, David, (Autor de correspondencia); Baquero, Enrique; et al.
Revista: BIODIVERSITY INFORMATION SCIENCE AND STANDARDS
ISSN 2535-0897  Vol. 3  2019  págs. 1 - 2
In business, the "long-tail economy" refers to a market strategy where the gravity center shifts from a few high-demand products to many, varied products focused on small niches. Commercialization of individually low-demand products can be profitable as long as their production cost is low and, all taken together, they aggregate into a big chunk of the market. Similarly, in the "business" of biodiversity data acquisition, we can find several mainstream products that produce zillions of bits of information every year and account for most of the budget allocated to increase our primary data-based knowledge about Earth's biological diversity. These products play a crucial role in biodiversity research. However, along with these large global projects, there is a constellation of small-scale institutions that work locally, but whose contribution to our understanding of natural processes should not be dismissed. These information datasets can be collectively referred to as the "long-tail biodiversity data".
Autores: Latorre, D. ; Maso, G.; Hinckley, A.; et al.
Revista: MARINE AND FRESHWATER RESEARCH
ISSN 1323-1650  Vol. 69  Nº 8  2018  págs. 1326 - 1332
The native European freshwater cyprinid fish, common bleak Alburnus alburnus (Linnaeus, 1758), is an invasive non-native fish in the Iberian Peninsula, where it threatens the valuable endemic fish fauna. Despite the bleak's invasive status, there is a dearth of studies on the biological traits of non-native populations in Europe's Mediterranean region, and the present study aimed to compare bleak growth and reproductive traits across the principal rivers of Iberia with those from a native 'reference' bleak population in France. Non-native bleak from the River Tagus had the highest back-calculated total lengths (TLs), growth rate and body condition, but the lowest reproductive investment and smallest egg size of all studied populations. Whereas, these latter two traits were the highest in the River Ebro, where fecundity was the lowest for all Iberian rivers. The youngest age and the smallest TL at maturity were observed in the River Ebro. The River Segura had the lowest back-calculated TLs and growth rate, the highest fecundity and proportion of females, and the oldest age at maturity. Population traits of bleak in the River Saone (the native 'reference' population) were generally different from those in Iberian rivers, except for the River Ebro. This wide inter-population variability contributes to the species' successful establishment in novel habitats.
Autores: Miranda, Rafael;
Revista: ORNIS FENNICA
ISSN 0030-5685  Vol. 95  2018  págs. 00 - 00
During the check-rearing period, strategies of prey provisioning can have a decisive impact on several reproductive aspects. Adults can maximise their foraging effort by increasing the number of fish-prey brought to the nest per unit time and/or by catching more energetic prey, i.e. larger prey or prey with relatively higher caloric values. The Common Kingfisher (Alcedo atthis) is a fish-eating predator normally breeding in freshwater habitats. We collect data on fish-prey proportions found at nests (n=10) and determined the caloric content of such fish-prey (6 species overall) in rivers in northen Iberia. The proportion of each fish-prey species in the nest was not correlated with the proportion of lipids, proteins or carbihydrates, nor with its caloric content. Furthermore, the most energetic prey was nor the most coomonly consumed, illustrating the fact that the Common Kingfisher does not fish for the most energetic prey during the chick-rearing period.
Autores: Miranda, Rafael, (Autor de correspondencia); Tobes, Ibon; Gaspar, S.; et al.
Revista: ECOSCIENCE
ISSN 1195-6860  Vol. 25  Nº 1  2018  págs. 85 - 95
Knowledge of the fish assemblages of Andean mountain streams is restricted to accessible areas. This study is the first biological survey of the remote Suaza River in the Colombian Andes, at its source in the Cueva de los Guacharos National Park. Mechanistic insight into the ecological patterns and gradients of the river is provided, focusing on the spatial distribution of fish communities in relation to environmental variables and habitat characteristics. Electrofishing surveys and macroinvertebrate sampling were carried out, the river habitat was characterized, three environmental quality indices were applied, and potential water pollutant concentrations were measured. Twenty-seven fish species were recorded - two of them exotic (Poecilia reticulata and Xiphophorus hellerii) - as well as 45 macroinvertebrate families. Fish species richness was higher at lower altitudes with gentle slopes, where habitat temperature, size and heterogeneity were higher. Although macroinvertebrate diversity slightly increased downstream following a similar pattern as fish species richness, it declined at lower sites. Fish assemblages were distributed in three clusters corresponding to headwaters, middle sections and lower reaches of the river, showing correlations with environmental factors, suggesting habitat preferences. Although the headwaters of the Suaza River remains pristine inside the park, human influence is responsible for ecosystem alteration downstream.
Autores: Benejam, L., (Autor de correspondencia); Tobes, Ibon; Brucet, S.; et al.
Revista: ECOLOGICAL INDICATORS
ISSN 1470-160X  Vol. 90  2018  págs. 366 - 378
The estimation of biodiversity is complex in remote areas like Andean-Amazon piedmont where the lack of knowledge is noticeable and most species have not yet been identified. An alternative to the taxonomical approach to assess biodiversity and community structure is to study the body size structure of the community. The present study aimed to identify systematic changes of the size structure of fish communities along the altitudinalgradient of pristine Andean streams. At the same time, we assessed if size structure of fish communities could be an alternative or complementary approach to traditional taxonomic metrics of ecological assessment. This study was conducted along two rivers of eastern Andean piedmont: Hacha River and Alto Madre de Dios basin. Our analysis showed lower values of total size range, maximum length and number of size classes in the highest places and increasing in lower reaches of the rivers. Concerning abundance size spectra, we found flatter slopes (indicating higher relative abundance of large fish) and lower coefficient of determination (i.e. less linear size spectra) and intercept at y-axis on upstream reaches. On the other hand, fish abundance, species richness and species diversity increasing from upstream to downstream. These systematic changes on size-related variables were similar using both basins together or independently and may be used in future studies as management reference conditions when assessing the effect of perturbations ...
Autores: Miranda, Rafael;
Revista: AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
ISSN 1052-7613  Vol. 27  Nº 4  2017  págs. 898 - 899
Autores: Bermejo-Busto, J.; Martín-Gómez, César; Zuazua-Ros, A.; et al.
Revista: ENERGY AND BUILDINGS
ISSN 0378-7788  Vol. 134  2017  págs. 25 - 36
Finding new solutions for energy recovery in buildings is crucial to diminish the energy consumption. Some proposals may unveil innovative products to solve this challenge. However, reinventing and reformulating the configuration of available solutions might be another way to find an inventive answer to the energetic problem. The main aim of this article is to check if several cores connected in a cascade layout and installed in two different rooms can provide a better performance making use of energy from exhaust air. This study was inspired by the rete mirabile of tuna. This strategy proposed by nature has been translated into building services. Thanks to this reinterpretation, a new configuration of heat recovery ventilators (HRVs) has been simulated with CFD software. The results obtained show that up to 44.5% of energy could be saved with the new configuration making it a promising solution and a foreseeable application for energy recovery in buildings.
Autores: Angulo-Rodeles, A.; Galicia, David; Miranda, Rafael;
Revista: AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
ISSN 1052-7613  Vol. 27  Nº 4  2017  págs. 880 - 885
1. Many human activities in and on rivers cause the loss of freshwater biodiversity, especially fish, which now are one of the most endangered vertebrate groups. River fragmentation caused by the construction of dams is one of the main threats to fish species. In Spain, which has the highest number of dams per square kilometre in the world, more than half of all fish species are threatened by these constructions. The government has initiated the National Strategy for River Restoration, a plan to restore rivers and preserve their inhabitants, which includes the removal of dams. 2. An information search and query was conducted to determine if fish monitoring was performed before and after dam removal, and the result was negative. Therefore, an assessment of the effects of dam removal on fish communities at a large spatial scale was not possible. Instead, an analysis was carried out to measure the effects of dam removal on river connectivity using a geometric network. 3. The analysis of river connectivity improvement showed that 66% of removed dams had one or more dams less than 5km away. The removal of dams increased the connected river length by an average of 6.4km per dam removed, with the range varying between 1.04km and 9.48km, depending on the river basin. 4. These results show that, although monitoring programmes are strongly recommended after restoration actions, they are not usually performed. This is a wasted opportunity to gather large datasets to understand better the effects of human actions on fish communities and on rivers. 5. River connectivity results may reflect a demolition strategy based more on economic and social opportunism rather than on ecological considerations. It is strongly recommended that dam removal plans should be based on ecological selection methods to achieve greater river improvements with less investment.
Autores: Galicia, David; Baquero, Enrique; et al.
Revista: MARINE AND FRESHWATER RESEARCH
ISSN 1323-1650  Vol. 68  Nº 5  2017  págs. 900 - 908
The identification of habitat requirements of invasive species is essential to evaluate their spread and to assess the vulnerability of recipient ecosystems. We studied the distribution and abundance of the invasive signal crayfish (Pacifastacus leniusculus) in 43 sites in northern Spain and analysed the relationships with several abiotic and biotic parameters of the aquatic ecosystems. Our results indicated that the abundance of signal crayfish was positively associated with vegetation cover and negatively associated with boulders. Also, its abundance was positively correlated with water temperature, organic matter, cations (e.g. sodium), anions (e.g. sulfates) and abundance of some native fish species (Parachondrostoma miegii and Luciobarbus graellsii). We concluded that the habitat of signal crayfish is among salmonid stretches (headwaters) with cold waters and low proportion of organic debris, and among cyprinid stretches (low waters) with warmer waters which it inhabits with another invasive crayfish, the red swamp crayfish (Procambarus clarkii). Our analysis indicated that the presence of signal crayfish is limited in the uppermost stretches by lower water temperatures and a lower proportion of organic debris. The existence of a natural environmental limiting factor in upstream reaches facilitates the conservation of aquatic ecosystems and native fauna.
Autores: Copp , G. H.; Tarkan, A. S.; Masson, G.; et al.
Revista: REVIEWS IN FISH BIOLOGY AND FISHERIES
ISSN 0960-3166  Vol. 26  Nº 3  2016  págs. 441 - 469
North American black bullhead, Ameiurus melas, which were introduced to Europe in the nineteenth and twentieth centuries, have received relatively little study. With focus on growth and reproduction, this extensive review, which includes new European data, aims to inform the risk analysis process concerning this non-native species in Europe. Surprisingly, the new data for Europe were more comprehensive than for native populations, with data available mainly from Oklahoma, and North and South Dakota (USA). In terms of relative growth, juvenile A. melas were found to have a relatively uniform body shape regardless of the population's origin, whereas adults developed different phenotypes depending upon location. Overall growth trajectory was significantly faster for native than for non-native populations. Growth index values decreased significantly with increasing latitude in non-native but not native populations-the latter decreasing weakly with increasing altitude in the populations located at latitudes <40 degrees. Mean general condition (slope ' b'), mean sex ratio and mean egg diameter did not differ significantly between native and non-native populations. Absolute fecundity was slightly (but not significantly) higher in non-native than native populations. GSI data, which were very scarce for native populations, suggest gonad production may be slightly higher in native than in non-native populations. Precise data on age at maturity (AaM) are lacking for the native range, wh
Autores: Tobes, Ibon; S.; et al.
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 32  Nº 1  2016  págs. 229 - 239
This work studied the ecological integrity of river ecosystems inside the Ordesa-Viñamala Biosphere Reserve in the central Spanish Pyrenees. Despite its protected status, the reserve endures a considerable number of human stresses, thus the aim was to evaluate the conservation status of the two river basins inside the protected area: The Gállego River Basin, inside the transition zone of the protected area and which allows a wide range of human activities; and the Ara River Basin, inside the buffer zone where only sound ecological practices are authorised. The environmental status of river ecosystems was analysed by studying fish and macroinvertebrate communities, hydrochemical and habitat characteristics and by calculating environmental quality indices. From August to September 2011, a total of 14 sites were sampled. Fish sampling was conducted using electrofishing gear, and macroinvertebrate were sampled by applying the IBMWP and IASPT procedures. Results showed that, while the Ara River Basin maintains a solid ecological integrity, the Gállego River Basin endures important habitat alteration. Trout, the dominant and exclusive species in the Ara River, were absent and replaced by translocated native cyprinids in the Gállego River Basin. This colonisation was explained by the alteration of the stream ecosystems and their homogenisation. The study of macroinvertebrate communities and the diagnosis obtained with the environmental quality indices also enhanced the deficient ecological integrity of some sites in the Gállego River. The results suggest that the Biosphere Reserve is not providing adequate protection to streams inside its boundaries, leading to major degradation of their biological integrity.
Autores: Tobes, Ibon; S.; M.; et al.
Revista: INLAND WATERS
ISSN 2044-2041  Vol. 6  Nº 1  2016  págs. 89 - 104
This work provides insight into an Andean¿Amazonian river system by conducting a comprehensive study of the biodiversity and ecological processes in a poorly studied neotropical freshwater ecosystem. Hacha River in western Colombia harbours a rich and largely unknown biodiversity and is experiencing an increase in anthropogenic impacts from the city of Florencia. Changes in natural habitat characteristics and environmental quality were analysed and related to the distribution of fish and macroinvertebrates. Four environmental quality indices were applied, and concentrations of potential water pollutants were measured. All environmental quality indices used were reliable because they produced similar assessments of the ecological integrity of the study sites and were inversely related to the potential water pollutant concentrations. Fish and macroinvertebrate communities notably changed in response to differences in environmental quality, reinforcing the ecological integrity assessments. Nevertheless, natural gradients that influence fish and macroinvertebrate distributions showed an overlap with changes in environmental quality, thereby confounding the ability to discern the influence of natural and anthropogenic-induced alterations and to confirm an initial shift in fish assemblages due to anthropogenic impacts.
Autores: Zuazua-Ros, A., (Autor de correspondencia); Martín-Gómez, César; Bermejo-Busto, Javier; et al.
Revista: BUILDING SIMULATION
ISSN 1996-3599  Vol. 9  Nº 3  2016  págs. 343 - 357
This paper is comprehended in the study of the application of the biomimicry science in building services and energy management, taking as a reference the case of tuna. Tuna generates heat in the muscles, organs and tissues of the inner area of its body (dark muscles). This heat is distributed in the periphery in order to maintain constant body temperature. From this biological reality, researchers analyse the possibility of altering the heating demand of an office on the basis of the heat conservation strategy applied by tuna, merely modifying the working-spaces. For this purpose, an existing office building with high architectonical quality parameters has been chosen and different scenarios have been defined in order to perform the energy simulations. The case studies correspond to the variations in the floor layout and occupancy density distribution. Besides, they are studied in three European cities with different climate. The evaluation of results is mainly focused on the heating demand since tuna strategy comprises the heat management. It is shown that the arrangement of high thermal load locals affects the heating demand of the building, being more efficient the tuna distribution in order to lower the demand.
Autores: Tobes, Ibon; Miranda, Rafael; S.; et al.
Revista: ACTA ICHTHYOLOGICA ET PISCATORIA
ISSN 0137-1592  Vol. 46  Nº 2  2016  págs. 137 - 140
The knowledge of freshwater fishes in remote Andean mountains is scarce and restricted to changes of occurrence distribution along a specific gradient. The high number of endemic fish species requires further studies regarding their biology and their conservation status. The present study aims to estimate the length-weight, length-length, and length-girth relations for nine native freshwater fish species representing five families (Loricariidae, Characidae, Heptapteridae, Crenuchidae, and Parodontidae): Chaetostoma thomsoni Regan, 1904; Lasiancistrus caucanus Eigenmann, 1912; Rineloricaria jubata (Boulenger, 1902); Bryconamericus huilae Roman-Valencia, 2003; Gephyrocharax melanocheir Eigenmann, 1912; Pimelodella chagresi (Steindachner, 1876); Rhamdia guatemalensis (Quoy et Gaimard, 1824); Characidium fasciatum Reinhardt, 1867; Parodon suborbitalis Valenciennes, 1850. The fishes were collected in the Suaza River (Huila, Colombia). These are the first length-weight relations reported for all these species, mostly endemic to the Colombian Andes. The report also provides the new maximum size for four species.
Autores: Tobes, Ibon; Miranda, Rafael; et al.
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 32  Nº 6  2016  págs. 1256 - 1258
The present work provides the estimates of morphometric relationships for 22 native freshwater fish species (11 Characidae, five Loricariidae, two Heptapteridae, one Astroblepidae, one Crenuchidae, one Curimatidae and one Erythrinidae) collected in the Alto Madre de Dios River (Cuzco and Madre de Dios, Peru) in June 2012 using a mobile backpack electrofishing unit. These are the first length¿weight relationships reported for 24 species, mostly endemic to the Amazonian basin. Knowledge regarding these biometric relationships can be relevant in the management and conservation of the local fishes and fisheries.
Autores: A.; Galicia, David; Miranda, Rafael;
Revista: SCIENTIFIC DATA
ISSN 2052-4463  Vol. 3  2016  págs. UNSP 160091
The study of freshwater fish species biodiversity and community composition is essential for understanding river systems, the effects of human activities on rivers, and the changes these animals face. Conducting this type of research requires quantitative information on fish abundance, ideally with long-term series and fish body measurements. This Data Descriptor presents a collection of 12 datasets containing a total of 146,342 occurrence records of 41 freshwater fish species sampled in 233 localities of various Iberian river basins. The datasets also contain 148,749 measurement records (length and weight) for these fish. Data were collected in different sampling campaigns (from 1992 to 2015). Eleven datasets represent large projects conducted over several years, and another combines small sampling campaigns. The Iberian Peninsula contains high fish biodiversity, with numerous endemic species threatened by various menaces, such as water extraction and invasive species. These data may support the development of large biodiversity conservation studies.
Autores: Miranda, Rafael; et al.
Revista: INLAND WATERS
ISSN 2044-2041  Vol. 6  Nº 1  2016  págs. 54 - 64
Environmental conditions and host features that influence the abundance of an exotic branchiobdellidan were studied. One of the most widespread invasive crayfish species in Europe is the signal crayfish, Pacifastacus leniusculus (Dana, 1825). Along with this invasive crayfish, other alien species that live on the crayfish¿s body surface, such as bacteria, algae, fungi and invertebrates, were introduced. One of these symbiont species is a branchiobdellidan worm, Xironogiton victoriensis (Gelder and Hall, 1990). Because a previous study identified this exotic branchiobdellidan in 3 different and spatially separate populations of the red swamp crayfish, Procambarus clarkii (Girard, 1852), an investigation into the factors affecting its abundance was necessary. We sampled 1817 sites between 2005 and 2013 in the Ebro Basin (Spain), and the distributions of X. victoriensis and P. leniusculus were represented and interpreted. Furthermore, we sampled 2914 crayfish from 43 Spanish localities to investigate the influence of environmental conditions and host features (sex, body size, body condition, density and ecdysis) on the abundance of X. victoriensis. The abundance of the branchiobdellidan was higher in the largest individuals and in those showing the best body condition. The crayfish body condition (or welfare) increased significantly with the branchiobdellidan infestation, suggesting that mutualism is the biological relationship between X. victoriensis and P. leniusculus. Although 91.04% of the adult signal crayfish were infested with X. victoriensis, only 59.3% of the juveniles were infested. Nonmolted crayfish had higher branchiobdellidan abundance than that of recently molted host specimens; however, the abundance of the symbiont did not differ between sexes and host densities. Finally, biochemical oxygen demand, phosphates, coliforms, and potassium were positively related with the branchiobdellidan abundance. The relationships between some environmental variables and the abundance of branchiobdellidans have not been previously well studied, and these findings will be important for risk assessments and models predicting the spread of exotic branchiobdellidans.
Autores: Miranda, Rafael;
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 32  Nº 1  2016  págs. 240 - 248
The number of threatened freshwater fish species in Spain is among the highest recorded in Europe and includes a high percentage of endemic taxa. Investigated were the distribution of Spanish freshwater fish to identify priority areas for conservation and assess the extent to which freshwater fish are included in the existing network of protected areas. Considered were those threatened species recorded in the Spanish National inventories. From these data, several biodiversity indices were calculated and analysed. The results reveal important discrepancies between the national and international assessments of conservation status, whereby the current Spanish national catalogue needs updating to reconcile these inconsistencies. Several important areas for the conservation of freshwater fish lie outside protected areas. The results encourage the establishment of protected areas specifically for freshwater environments. An extensive database of Spanish freshwater fish species is needed to redefine priority areas and to maintain freshwater biodiversity.
Autores: Bermejo Busto, Javier; Martín-Gómez, César; Zuazua-Ros, A.; et al.
Revista: DYNA (ESPAÑA)
ISSN 0012-7361  Vol. 91  Nº 5  2016  págs. 507 - 511
The article proposes new ways of work to redesign previous Peltier cells prototypes using biomimetic methodologies. Biomimicry can be a source of fresh ideas to solve contemporary problems. Also in terms of energy saving and efficiency, animals can be of aid. Ectotherms, animals that depend on external factors to be in a range of `living temperature¿, have developed strategies to survive and adjust their metabolism regarding the environment and weather conditions. Social insects are ectotherm animals. One specimen of these species cannot be autonomous and would die if he is out of his nest for a long or even short time. Previous studies made about bees behaviour in beehives show up an automated and accurate work to maintain nest temperature. Strategies such as the heat shield or stigmergy have been translated to obtain better control of the air cavity and a decentralized computational control of the equipment.
Autores: Galicia, David; Miranda, Rafael; et al.
Revista: TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY
ISSN 0002-8487  Vol. 144  Nº 2  2015  págs. 431 - 442
The Owens Tui Chub Siphateles bicolor snyderi has become endangered by introgressive hybridization with the Lahontan Tui Chub S. bicolor obesa since the 1960s. Adequate conservation strategies require prior identification of pure populations, which is usually difficult because the diagnostic features presented in the formal subspecies description do not always allow unequivocal determination of populations. In the present study, the shape and some meristic features of the scales, along with the shape of other bones with taxonomic value, were analyzed to distinguish both parental subspecies and their hybrids in samples diagnosed in a previous work using microsatellite DNA. Scales, pharyngeal arches, dentaries, cleithra, and opercula of 211 individuals from 16 localities across the Owens River and neighbouring basins in California and Nevada were compared. The results show that the meristic parameters of the scales were in agreement with values provided by Miller (1973) for the parental subspecies. Shape analyses were based on landmark or Fourier methods, depending on the shape characteristic of each structure. Geometric morphometric analyses provided variable discriminatory power between subspecies depending on the studied bone. In scales, pharyngeal arches, and dentaries, the derived morphological patterns matched the shape descriptions set forth by Miller (1973) for both parental subspecies. In all cases, the observed morphometric variability of hybrids was too high to separate them from parental subspecies. However, joint analysis of the five structures produced groupings that were concordant with the genetic analyses: localities of parental subspecies in separate groups and an intermediate group with the hybrid swarm localities that was morphologically closer to Lahontan. Finally, a new derived parameter (the ratio between scale lengths from the anterior and posterior body) is suggested as a promising tool for rapid discrimination of Owens Tui Chub from Lahontan Tui Chub and their hybrid populations.
Autores: Bautista-Hernández, C. E.; S.; G.; et al.
Revista: ZOOKEYS
ISSN 1313-2989  Vol. 482  2015  págs. 55 - 66
Paracreptotrema rosenthali sp. n. was discovered in the intestine of Xiphophorus malinche and Pseudoxiphophorus jonesii, collected from the headwaters of Rio Malila, tributary of Rio Conzintla, in the Rio Panuco basin, Hidalgo, Mexico, during 2008-2009. The new species differs from the five known species of Paracreptotrema Choudhury, Perez-Ponce de Leon, Brooks & Daverdin, 2006 by having vitelline follicles that extend from a level anterior to the pharynx to mid-testes, the seminal vesicle which is more extensively folded, and a wider cirrus sac. The new species resembles P. heterandriae in the length of its ceca, which surpasses the posterior margin of the ovary but do not reach the testes. A key to the species of Paracreptotrema is provided.
Autores: Miranda, Rafael; Ariño, A.H.; et al.
Revista: CONSERVATION BIOLOGY
ISSN 0888-8892  Vol. 29  Nº 2  2015  págs. 599 - 601
Autores: Rueda, J.; et al.
Revista: INLAND WATERS
ISSN 2044-2041  Vol. 5  Nº 1  2015  págs. 89 - 92
Invasive alien species present a global threat to biodiversity, particularly where pathogens and symbionts are involved. Branchiobdellidans are clitellate annelids with an obligate ectosymbiotic association primarily on astacoidean crayfish. There are several examples of branchiobdellidan species adopting a geographically exotic host where endemic and exotic crayfishes cohabit the same water body. The first records of a western North American branchiobdellidan, Xironogiton victoriensis, adopting the eastern North American crayfish, Procambarus clarkii, in 2 river basins in Spain provide further evidence of the ectosymbionts¿ tolerance to adopt an exotic host. Given worldwide translocations of these and other commercial crayfish species, limnologists and agency managers need to be alert for further introductions of X. victoriensis and other branchiobdellidans. Impacts of these exotic ectosymbionts on habitat and biota at a new location are unknown, as are their consequences on native biodiversity.
Autores: Culumber, Z. W.; S.; Miranda, Rafael;
Revista: ENVIRONMENTAL BIOLOGY OF FISHES
ISSN 0378-1909  Vol. 97  Nº 2  2014  págs. 157 - 161
Biosphere reserves have been established around the world as a means to protect sensitive or threatened ecoregions and the biodiversity within them. As such, the organisms occurring within these reserves are important from a conservation perspective as they often represent endemic species or remnant populations. Here we provide genetic evidence of widespread occurrence of Xiphophorus helleri within the Metztitlan Canyon Biosphere Reserve in Hidalgo, Mexico. One nuclear and two mitochondrial genes were sequenced from four populations within the canyon and confirmed that the specimens collected were X. hellerii. When compared to published sequences of X. hellerii from multiple localities within the documented natural range of the species, the specimens from Metztitlan were found to exhibit between 0 and 1.6 % sequence divergence. Possible scenarios for colonization of the canyon and conservation implications are discussed.
Autores: Galicia, David; Pulido-Flores, G.; Miranda, Rafael; et al.
Revista: ZOOKEYS
ISSN 1313-2989  Nº 403  2014  págs. 67 - 109
The state of Hidalgo (Mexico) is an important region from the point of view of biodiversity. However, there exists a significant gap in accessible knowledge about species diversity and distribution, especially regarding to freshwater ecosystems. This dataset comprises the sampling records of two projects developed in Hidalgo between 2007 and 2009 about the freshwater fish communities of Tecocomulco lake and rivers belonging to the Metztitlan Canyon Biosphere Reserve. It contains the taxonomic identity (species level) and basic biometric data (total length and weight) as well as date of collection and coordinates of more than 9000 specimens. This dataset is the primary result of the first and unrepeated exhaustive freshwater fish's survey of Metztitlan Canyon Biosphere Reserve and Tecocomulco lake. It incorporates seven more species to the regional fish fauna, and new exclusive biometric data of ten species. This dataset can be used by studies dealing with, among other interests, North American freshwater fish diversity (species richness, distribution patterns) and biometric analyses, useful for the management and conservation of these areas. The complete dataset is also provided in Darwin Core Archive format.
Autores: Ariño, A.H.; Miranda, Rafael;
Revista: BIODIVERSITY AND CONSERVATION
ISSN 0960-3115  Vol. 23  Nº 9  2014  págs. 2239 - 2258
The knowledge of species occurrence within an area is crucial to develop proper conservation strategies to protect species diversity. Biosphere Reserves (BRs), established to preserve biodiversity and sustainably use their resources, should therefore have precise information of its biodiversity. We compared and evaluated information on threatened and non-threatened vertebrate species available for Spanish BRs from three sources: management documents (MDs), the Global Biodiversity Information Facility index (GBIF), and atlases and red books. Our results suggest that information from any one source was rather partial, to a degree that depended on which vertebrate group was considered. Management documents did list a high percentage of threatened species found in BRs, reaching up to the total number of species of birds and mammals. Species lists overlap between all three sources ranged from 59 % for fish to 84 % for mammals. In addition, there is an inconsistency between national and international threatened species categories and it should thus call for revisions. Even though the information of non-threatened and threatened species occurrence in MDs of Spanish BRs is good, it is necessary to pay attention to amphibian and fish species which are less recorded.
Autores: Ariño, A.H.; et al.
Revista: BIOLOGICAL CONSERVATION
ISSN 0006-3207  Vol. 173  2014  págs. 74 - 79
The knowledge of biodiversity within an area is vital if we want to develop adequate conservation strategies. Biosphere Reserves are purposefully established for the sustainable use of their resources, and therefore their biodiversity should be well known. We compared and evaluated information available for Mexican Biosphere Reserves on threatened and non-threatened vertebrate species records from three different sources ¿ the corresponding Biosphere Reserves management plans (MPs), the Global Biodiversity Information Facility index (GBIF), and scientific literature, in order to find potential knowledge gaps. Our results suggest that there were varying gaps in information among sources according to vertebrate group. For each group of vertebrate species, management plans held the largest subsets of information but were not complete, ranging from 89.6% of the combined known species of birds to 70% for amphibians and freshwater fishes. However, both GBIF and literature included data absent from MPs, and GBIF included data not otherwise available, proving it as important as literature or other data sources (e.g. field data) used for crafting such plans. Moreover, we found references to threatened species that were not listed in the MPs, reaching to as many as 50% of the total known species of fish. Species information shared by all three sources ranged from 28% for amphibians to 72.5% for birds. Conservation efforts should therefore take into account that possibly less charismatic taxa such as amphibians, reptiles and freshwater fish lack more information than birds or mammals. The disparity observed in the vertebrate species information constitutes an information gap that could (or should) be solved by scientists and managers alike.
Autores: Miranda, Rafael;
Revista: LIMNETICA
ISSN 0213-8409  Vol. 32  Nº 2  2013  págs. 269 - 285
This paper reviews information relevant to managing the four crayfish species present in the Iberian Peninsula. The red swamp crayfish, Procambarus clarkii, signal crayfish, Pacifastacus leniusculus, and Yabbie, Cherax destructor, are classified as invasive alien species by Spanish legislation. The most significant negative impacts of these species in freshwater ecosystems are noted, and some management methods are proposed. In addition, scientific studies addressing the origin and taxonomy of the Iberian white-clawed crayfish, Austropotamobius italicus italicus, are discussed. The Iberian populations of A. i. italicus have been severely diminished since the onset of the expansion of the aphanomycosis disease in 1978. However, this trend began to undergo reversal a few years ago, and the populations of this species are now growing. Finally, current legislation concerning the fishing and conservation of crayfish species is explained and discussed.
Autores: Herrero, C.; Uría, Jaime; Ibáñez, R; et al.
Revista: REPORTS OF THE FINNISH ENVIRONMENT INSTITUTE
ISSN 1796-1718  Vol. 25  2013  págs. 47 - 50
Autores: Domínguez-Domínguez, O.; Reina, R.; et al.
Revista: MOLECULAR PHYLOGENETICS AND EVOLUTION
ISSN 1055-7903  Vol. 66  Nº 1  2013  págs. 80 - 90
Phylogenetic relationships of species of genus Pseudoxiphophorus have been only tackled in detail based on morphology so far. However, phylogenetic evidence based on molecular data is still lacking. In this study, we have used five molecular markers (mitochondrial cytb, 16S, atp6-8, and nuclear actB and S7) to reconstruct a robust, inclusive phylogeny of Pseudoxiphophorus. Our phylogenetic results strongly disagree with the main morphological hypothesis, and indicate different phylogenetic relationships among the recognized species of Pseudoxiphophorus. Pseudoxiphophorus jonesii is recovered as the sister group of all other Pseudoxiphophorus lineages, and this initial splitting may be associated to the extension of the Mexican Neovolcanic Plateau at the Punta del Morro site (event used to calibrate our dating analysis). The branch leading to all other Pseudoxiphophorus separated subsequently into two major groups, one comprising those lineages occurring in southern Mexico and Guatemala-Belize, and another with those lineages that extended further southwards to Honduras and Nicaragua. This event took place during the Pliocene, and is likely associated with periods of inundation of the Polochic-Motagua fault area. The Isthmus of Tehuantepec also appears to have been a strong biogeographic barrier triggering cladogenesis in Pseudoxiphophorus. Heterandria formosa (traditionally placed as sister to Pseudoxiphophorus) is not sharing the most recent common ancestor with Pseudoxiphophorus, and is recovered as more distantly related to them. Furthermore, Pseudoxiphophorus bimaculatus (the most cosmopolitan species) is also recovered as a polyphyletic assemblage that appears to comprise those Pseudoxiphophorus that have not been assigned to the other eight, more localized species. All this suggests that Pseudoxiphophorus needs a major taxonomic revision as a whole in order to incorporate all existing diversity.
Autores: J.; Miranda, Rafael; et al.
Revista: KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS
ISSN 1961-9502  Vol. 410  2013  págs. 03
The effect of fish-eating birds on their fish-prey populations has been a matter of concern to conservationists, anglers and fishery interests, especially when both bird and fish species have conservation status and are afforded some protection by law. Understanding the predator-prey interactions will assist in managing these potential conflicts. This situation could arise with the Common Kingfisher (Alcedo atthis), whose range covers many important Atlantic salmon (Salmo salar) rivers. In order to increase our knowledge on predator-prey interactions between these species, we collected data on the diet and feeding rates of a kingfisher population breeding in an Atlantic salmon river in southern England (River Frome). Results showed that, during nestling period, kingfishers provided a mean of 62 fish per day to the nest and that the mean salmon intake was 2.5% of the entire diet, which is equivalent to 86 salmon parr consumed by each kingfishers pair for the entire breeding period (assuming 2.2 broods/pair/year). The total 0-group salmon population in the River Frome was 63 900. The estimated loss of 0-group salmon parr to the kingfishers over one season was 0.8%, thus supporting the view that the kingfisher has a negligible biological impact over this salmon population.
Autores: Galicia, David; Miranda, Rafael; et al.
Revista: JOURNAL OF FISH AND WILDLIFE MANAGEMENT
ISSN 1944-687X  Vol. 4  Nº 2  2013  págs. 326 - 331
Regression parameters for the length of several bony structures against fish body length, and for body length against body weight, were determined for Owens tui chub Siphateles bicolor snyderi, Lahontan tui chub Siphateles bicolor obesa, and hybrid swarm deriving from the two species. Two-hundred eleven individuals from 16 localities from the Owens River and neighboring basins along the border between California and Nevada were used for regression analyses. The coefficient of determination of linear regressions for scales, pharyngeal arches, dentaries, cleithra, and opercula against body length were consistently high (r(2) >= 0.9). Differences between subspecies were mainly with reference to the intercept parameter in comparisons involving Lahontan tui chub. Coefficients of determination from log-linear length-weight regressions were also high (r(2) >= 0.9) for individual taxa and for the pooled data set combining both Lahontan and hybrid species. The length-weight relationship did not differ between subspecies. Estimates of the length-weight relationship using data pooling both Lahontan and hybrid tui chub suggest a weak allometric growth effect (P < 0.05). The bone-length to body-length and body-length to body-weight relationships presented here will be useful tools for future dietary studies of tui chub predators as well as for archaeological and paleontological studies on tui chub remains.
Autores: I.; et al.
Revista: BEHAVIOURAL PROCESSES
ISSN 0376-6357  Vol. 98  2013  págs. 25 - 30
To investigate how depth and bottom color affect prey selectivity in Common kingfisher (Alcedo atthis), we developed several experimental procedures using captive birds. We used 20 young kingfishers to test depth (25 or 50 cm) and color (natural gravel or white) effects on foraging behavior. Live freshwater fish were used as target prey. To assess differences resulting from the natural behavior of different fish, we chose bottom-dwelling [Ebro barbel (Barbus graellsii)] and open-water benthopelagic species [Ebro nase (Parachondrostoma miegii) and Pyrenean minnow (Phoxinus bigerri)]. The number of attempts and captures, as well as the effects of hunger and experience, were assessed relative to feeding behavior. The effect of fish behavior, as observed in grouped vs. isolated fish, on the kingfisher's performance was also tested. The results showed a significant effect of depth, with more attacks and greater success in shallow waters. No significant differences in catch success between natural- and white-colored bottoms were observed. Hunger had no effect on fishing success, but experience had a positive effect in shallow waters and on white bottoms. Both bottom- and open-water species were consumed equally. Kingfishers preyed more often upon grouped prey than upon isolated prey, although capture success did not vary between the two cases. Our results suggest that kingfishers prey upon the most accessible types of prey.
Autores: Miranda, Rafael; Santamaría, Jesús Miguel;
Revista: Environmental Engineering and Management Journal
ISSN 1582-9596  Vol. 11  Nº 6  2012  págs. 1045 - 1048
Autores: Sistiaga, M.; et al.
Revista: Environmental Engineering and Management Journal
ISSN 1582-9596  Vol. 11  Nº 6  2012  págs. 1111 - 1124
The characterization of fish communities and their relationships with abiotic factors is necessary for a number of environmental management issues. This study aims to analyze the spatio-temporal variability in the structure of fish communities in an undisturbed and unpolluted Pyrenean river in relation to aquatic habitat features. Fish and habitat were sampled seasonally in 2002 at fourteen sampling sites along the Erro River, a tributary of the Ebro basin (Navarra, northern Spain). Fish communities comprised eight native species, and their capture efficiency estimates were high and consistent along the river. Differences between species in estimated capture probability values were related to attributes such as body size and/or abundance, underscoring the importance of using species-specific capture probabilities. The observed low variability of species capture probabilities allows their use as reference values for future population size estimations based on single-run electrofishing surveys in similarly sized rivers. The longitudinal fish species distribution was analyzed by means of separate hierarchical cluster analyses performed on total species' densities and species' densities partitioned by size-classes, both of which displayed similar patterns of fish community composition along the Erro River. The changes on species presence and relative contributions to local fish communities along the river were also evident from diversity indices, which showed strong and significant positive relationships with distance from the source. Seasonal values in diversity indices were also significantly different within sampling sites, indicating that low-order streams support lower diversity and less-structured fish communities because seasonal flow variations lead to high variability in hydrochemical parameters, habitat size and diversity. Two separate canonical correspondence analyses were performed to jointly summarize the variation in aquatic habitat parameters in relation to fish community size structure in terms of densities or biomasses. In both analyses, the first axis was related to the along-river gradient and the second axis accounted for seasonal variation. The relative positions of fish species along the spatio-temporal gradients are in accordance with their habitat preferences described in the Pyrenean area. These results provide a framework for understanding how the spatio-temporal variations of reach-scale aquatic habitat features structure fish communities in a Pyrenean river with low anthropogenic disturbance.
Autores: Miranda, Rafael; Martínez-Lage, J.; Molina, J.; et al.
Revista: Environmental Engineering and Management Journal
ISSN 1582-9596  Vol. 11  Nº 6  2012  págs. 1125 - 1131
Construction and management of dams and reservoirs may cause substantial alterations to aquatic habitats. A large dam was constructed in a Pyrenean river (North of Iberian Peninsula) in 2002 and its stress controlled loading (SCL) took place between 2005 and 2009. In this study, hydrochemistry, macroinvertebrate biotic index and fish fauna are compared during the controlled loading preparation process and until 2011 in three stretches along a 40-km downstream section of the river. The most important changes in the hydrochemical parameters were the decrease of temperature and the increase of dissolved oxygen in the first and second sampled stretches. Changes in the fish fauna were also more important in the stretches closer to the dam. Fish fauna was strongly modified into a simplified community dominated by brown trout in the two upper stretches, where cyprinid and nemacheilid species decreased noticeably, especially smallest size classes. These negative effects in the fish fauna should be considered in the design and construction of a reservoir.
Autores: Gaspar, S.; Tobes, Ibon; Miranda, Rafael; et al.
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 28  Nº 4  2012  págs. 667 - 670
Body length and weight relationships were estimated for sixteen native freshwater fish species (ten Characidae, three Loricariidae, two Heptapteridae and one Astroblepidae, mainly small-sized fish) collected in the Andean piedmont Hacha River (Caqueta, Colombia) by electrofishing. These are the first lengthweight and lengthlength parameters reported for the species, which are mostly endemic to the Amazonian basin. Maximum lengths in eight of the sixteen studied species are also reported. Knowledge of this biometric data and their relationships can be relevant in the management and conservation of the local fish and fisheries.
Autores: Almeida, D.; Copp, G.H.; Masson, L.; et al.
Revista: Aquatic Conservation: Marine and Freshwater Ecosystems
ISSN 1052-7613  Vol. 22  Nº 1  2012  págs. 26 - 35
Autores: Miranda, Rafael; Arizaga, J.;
Revista: Munibe Ciencias Naturales
ISSN 0214-7688  Vol. 60  2012  págs. 159 - 166
El objetivo de este artículo es determinar la abundancia relativa de martines pescadores Alcedo atthis L., 1758 nidificantes en ríos de la zona calcárea de la mitad norte de Navarra. Para ello, durante el periodo de cría de 2007, entre los meses de abril y agosto, se inspeccionaron tramos de ríos dentro de la citada zona con el fin de localizar nidos activos y/o parejas nidificantes. Se utilizaron tres metodologías de censo: (1) localización de nidos, (2) captura de adultos para los que se observaron signos de reproducción y (3) localización de parejas adultas. Se recorrieron en conjunto 126,7 km, en los que se hallaron 7 nidos, siendo en consecuencia la abundancia relativa promedio de 0,06 pareja/km. Si a este valor se suman el número de parejas seguras, para las que se capturaron uno o los dos individuos con signos de reproducción, pero no se encontró el nido, la abundancia relativa se incrementa a 0,07 pareja/km. Si, finalmente, se añaden las parejas que se observaron durante este periodo y área de muestreo, pero no se capturaron y para las que no se encontró el nido, la abundancia relativa alcanzaría 0,13 pareja/km. En comparación con otras zonas tanto del ámbito peninsular como de Europa, la abundancia relativa obtenida es baja.
Autores: Miranda, Rafael; Arizaga, J.;
Revista: Acta Ornithologica
ISSN 0001-6454  Vol. 47  Nº 2  2012  págs. 169 - 177
The Common Kingfisher Alcedo atthis is a fish-eating predatory bird that is reported to prey mainly on pelagic, benthic, or both types of fish prey. It still remains unclear whether the species has the capacity to prey indistinctly on all types of fish, regardless of their position within the water column. The aim of our study was to test if kingfishers are able to select particular fish prey or if, by contrast, they feed on the most abundant and accessible fish. We identified the fish prey consumed by kingfishers at 14 nests in total, and also sampled, using electrofishing surveys, fish prey availability on the river stretches where the nests were located. We used Savage's index in order to check whether there was prey selection. Overall, kingfishers preyed upon eight fish species: Bermejuela Acondrostoma arcasii, Bleak Alburnus alburnus, Pyrenean Stone Loach Barbatula quignardi, Ebro Barbel Luciobarbus graellsii, Pyrenean Gudgeon Gobio lozanoi, Ebro Nase Parachondrostoma miegii, Pyrenean Minnow Phoxinus bigerri, and Brown Trout Salmo trutta. The most consumed prey were pelagic species (Pyrenean Minnow and Brown Trout). These results suggest that the Kingfisher preys on pelagic species because of their accessibility and avoids bottom-dwelling species, which may remain hidden from this predator, kingfishers preyed mostly on fish of 50 to 60 mm in length, but mean size values varied prey-specifically, possibly because of the vertical specific distribution in relation to the fish age and species and, finally, prey availability.
Autores: Miranda, Rafael; Arizaga, J.; et al.
Revista: ANNALES DE LIMNOLOGIE-INTERNATIONAL JOURNAL OF LIMNOLOGY
ISSN 0003-4088  Vol. 48  Nº 3  2012  págs. 289 - 294
The relative importance of biotic and abiotic variables on the Common Kingfisher Alcedo atthis breeding distribution in northern Iberian rivers was quantified through surveys completed in 2007. Eight rivers were surveyed for "positive" and "negative" (control) breeding territories (PBT and NBT, respectively). PBT (N=9) were 3-km river sections with breeding pairs; NBT (N=8) were 3-km river sections close to PBT, where no pairs were found, with apparently similar features to the PBT and one or more cut banks suitable for nesting. Stepwise discriminant analysis (SDA) correctly classified 94.1% of territories and revealed PBT was associated with higher oxygen concentrations, a lower maximum depth and lower proportion of rockfills. Causes and consequences of these findings are discussed.
Autores: Hossain, M.Y.; Rahman, M.M.; Miranda, Rafael; et al.
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 28  Nº 5  2012  págs. 818 - 822
The present study describes the size at first sexual maturity, fecundity, lengthweight (LWRs) and lengthlength relationships (LLRs) of the pool barb, Puntius sophore, using data obtained from different geographical locations in Bangladesh. A total of 905 specimens were caught by traditional fishing gear from March 2010 to February 2011. Additionally, a total of 121 females were collected from a commercial catch of the Padma River during JuneJuly 2011 to estimate size at first maturity and to determine fecundity. Total length (TL), fork length (FL) and standard length (SL) were measured with digital slide calipers. Individual body weights (BW) were determined for all specimens, and gonad weights (GW) from 121 females were weighed to an accuracy of 0.001 g. The female gonadosomatic index (GSI) was calculated as [GSI (%) = (GW/BW) x 100]. Female size at first maturity was estimated using GSI and TL as indicators, and estimated as 5.00 cm TL in the Padma River. Specimens larger than 5.00 cm TL were used to determine fecundity. Mean total fecundity was 5300 +/- 2700, ranging from 1580 to 16590. A positive exponential correlation was recorded between total fecundity and total length (r2 = 0.421). Relative fecundity ranged from 466 to 4036 (mean 1100 +/- 580) in the Padma River. The LWR of pooled data for sexes combined was estimated as BW = 0.0155 TL2.98 as ancova revealed no significant differences in LWRs between rivers (P > 0.05). All LLRs were highly correlated (r2 > 0.983; P < 0.001), and ancova analyses further indicated that LLRs did not differ between rivers (P > 0.05). These results will help in further studies on the population assessment of the species.
Autores: Miranda, Rafael; Galicia, David; Monks, S.; et al.
Revista: The Southwestern Naturalist
ISSN 0038-4909  Vol. 57  Nº 3  2012  págs. 285 - 291
The primary objective was to document the diversity of fishes in Reserva de la Biosfera Barranca de Metztitlan, Hidalgo, Mexico. Samples were collected from 35 localities using electrofishing, nets, and angling, and from local fishermen. A total of 7,290 specimens was collected, representing 16 species (including 4 introduced and 4 translocated). This study adds seven species to the regional fish fauna, five of which are exotic.
Autores: Almeida, D.; Tobes, Ibon; Miranda, Rafael; et al.
Revista: CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE
ISSN 0008-4301  Vol. 90  Nº 8  2012  págs. 1051-1057
Reproduction of pumpkinseed sunfish (Lepomis gibbosus (L., 1758)) in the species' native range often involves cuckoldry, consisting of dominant nest-guarding (parental) males and the participation by small "sneaker" males. However, it remains unknown whether this behaviour occurs in populations of non-native pumpkinseed. Thus, the present study describes the phenotypic features of cuckoldry under contrasting environmental conditions (lentic versus lotic) in southern Europe. Parental and sneaker pumpkinseeds were captured in the summer of 2011 from the River Bullaque (central Spain) and from the Encinarejo Reservoir (southern Spain). No differences in total length were observed in sneaker males, although individuals of ages 1+ and 2+ were significantly predominant in the river and the reservoir, respectively. Parental males were larger and older in the reservoir than in the river. Gonadosomatic and hepatosomatic indices were significantly higher in sneaker than in parental males at both sites. Body condition was lower in sneaker males in the river. Both ingested biomass and the proportion of full stomachs were lower in parental males at both sites, being significant in all cases except ingested biomass in the river. Sneaker males achieved a higher gonadosomatic index than parental males. In contrast, parental males had higher body condition indices than sneakers. Results demonstrate the high ecological plasticity of pumpkinseed sunfish to display natural behaviours out of its native area.
Autores: Masson, L.; Almeida, D.; Tarkan, A.S.; et al.
Revista: JOURNAL OF APPLIED ICHTHYOLOGY
ISSN 0175-8659  Vol. 27  Nº 5  2011  págs. 1286 - 1290
The identification of fish species from head bone remains is employed in various sciences, including archaeology, paleontology and field ecology, with the estimation of fish size from biometric relationships being useful in the assessment of predation pressure exerted by increasing numbers of piscivorous species (e.g. Eurasian otter Lutra lutra and great cormorant Phalacrocorax carbo). This is particularly relevant for crucian carp, Carassius carassius, which is in decline in Europe due to changes in land use and to increasing numbers of non-native Carassius species (i.e. goldfish C. auratus, gibel carp C. gibelio), which hybridize with C. carassius. However, diagnostic keys and biometric relationships are lacking for C. carassius and its most common hybrids, crosses with C. auratus. The present paper addresses this gap in knowledge, providing diagnostic keys and biometric relationships for the head bones of all Carassius species found in Europe as well as for C. carassius x C. auratus hybrids. All bone size to body length relationships were statistically significant. Similarly, all bone size to body weight relationships were significant for C. carassius, C. auratus, and C. gibelio, but none were significant for C. carassius x C. auratus hybrids. Diagnostic structures were found to distinguish easily between the Carassius species and hybrids, which will assist in determining the identity and sizes of prey found in faecal and archaeological remains.
Autores: Ariño, A.H.; et al.
Revista: Journal of Fish Biology
ISSN 0022-1112  Vol. 79  Nº 6  2011  págs. 1563 - 1591
Autores: Miranda, Rafael;
Revista: AQUATIC INVASIONS
ISSN 1798-6540  Vol. 5  Nº 3  2010  págs. 229 - 230
Autores: Pino del Carpio, A.; Miranda, Rafael; Puig, Jordi;
Revista: MANAGEMENT OF BIOLOGICAL INVASIONS
ISSN 1989-8649  Nº 1  2010  págs. 13 - 33
The consideration of non-native freshwater fish species in the management plans of 18 Biosphere Reserves is evaluated. Additionally, impacts caused by introduced freshwater fish species are described. Some measures to alleviate the ecological effects of fish species introductions are proposed, while paying attention to local development as well. The introduction of non-native species may have negative consequences for the ecosystems. The analysis of the management plans of the Reserves confirms that non-native freshwater fish species sometimes are not considered in the action plans of the area. Biosphere Reserve's management plans should consider the presence of alien species, with the aim to preserve biodiversity.
Autores: Miranda, Rafael; et al.
Revista: AQUATIC INVASIONS
ISSN 1798-6540  Vol. 5  Nº 3  2010  págs. 291 - 296
This paper extends the knowledge of the geographical distribution of non-native freshwater fishes in the Ebro River basin (Spain). More than two hundred surveys were carried out since 2000, and thirteen non-native fish species were collected on fifty-eight occasions. The spread of most of the recorded non-native species seems to be a consequence of illegal introductions related to sport fishing activities and the subsequent natural dispersal. Their presence could impact natural populations of Iberian native -mostly endemic- freshwater fish species, through direct predation and competition for niche and/or trophic resources.
Autores: Miranda, Rafael; Galicia, David; Monks, S.; et al.
Revista: HIDROBIOLOGICA
ISSN 0188-8897  Vol. 20  Nº 2  2010  págs. 185 - 190
A population of blackfin goodea Goodea atripinnis was encountered in the Metztitlan Canyon Biosphere Reserve (Panuco Basin, Hidalgo, Mexico). This species has a wide distribution across the Pacific Slope of Mexico, including the Lerma-Grande de Santiago basin, Ameca River, Magdalena Lake and the Balsas and Armeria basins. Biometric data were used for identification and comparison to those of other putative members of the genus. The taxonomic identification and systematic position of this species are discussed. Goodea luitpoldii and G. gracilis are confirmed as synonyms with G. atripinnis. Comments on conservation implications of this species and their Panuco Basin populations are given.
Autores: Miranda, Rafael;
Libro:  Freshwater fisheries ecology
2015  págs. 256 - 267
One of the distinguishing characteristics of the Mediterranean region and subtropical America is a high human consumption of water resources and, paradoxically, their relative scarcity. The Mediterranean and subtropical American climatic areas comprise the south of the United States, north and central Mexico, the south of Brazil, Paraguay and the north of Chile and Argentina. This geographical area is characterized by a range of climates that go from a very humid subtropical climate to some extreme climate changes with prolonged drought periods. For this reason, countries in subtropical America present interesting specialized endemic fishes, including the entire family of goodeids or many species of characids and cichlids. Additionally, the rivers and streams of this area are becoming increasingly degraded due to an uncontrolled exploitation of their water resources. While freshwater fisheries in the Mediterranean region and subtropical North America exist mainly as commercial and local food resources, in South America, recreational angling fisheries have more relevance. The use of non-native species in both aquaculture and angling activities is having serious consequences on the conservation of freshwater fishery resources.
Autores: Galicia, David; Miranda, Rafael;
Libro:  Identification guide of freshwater macroinvertebrates of Spain
2011  págs. 7 - 45
Autores: Galicia, David; Miranda, Rafael;
Libro:  Identification guide of freshwater macroinvertebrates of Spain
2011  págs. 1 - 5
This chapter provides a general introduction to the identification of macroinvertebrates, with particular emphasis on the management of river systems and the correct identification of these animals in field surveys. Subsequently, the study area and taxonomic groups considered are defined and delimited. Technical considerations about photographic methods are also included at the end of the chapter.
Autores: Galicia, David; Miranda, Rafael;
Libro:  Identification guide of freshwater macroinvertebrates of Spain
2011  págs. 47 - 148
This section of the book includes brief morphological and anatomical descriptions of the studied taxa. Data on the biology of the families is also provided, partly for completeness but also to allow the reader to gain a better understanding of these animals. The list of authors for each taxon is included in the front matter of this book.
Autores: Miranda, Rafael;
Libro:  Enciclopedia Virtual de los Vertebrados Españoles
2010  págs. 1-10
Autores: Rodeles, A. A.; et al.
2018 
Es una publicación que muestra las principales especies animales que habitan en la cuenca del río Baztan-Bidasoa. A lo largo de sus doscientas páginas y con el apoyo de cuidadas imágenes, cada especie cuenta con su descripción, con sus datos de distribución, el detalle de su biología y de su estado de conservación, facilitándonos su reconocimiento y aportándonos la información básica que nos va a permitir aprender sobre cada una de ellas.
Autores: Miranda, Rafael; Baquero, Enrique; et al.
2014 
Los ríos son los principales vertebradores del paisaje y su presencia condiciona el desarrollo de las poblaciones vegetales y animales, incluidas las humanas. Son ecosistemas complejos de una gran diversidad y riqueza. Sus condiciones ambientales particulares hacen que la flora y fauna asociadas sean también peculiares. Es el agua, indudablemente, la que condiciona esa biodiversidad. En este libro trataremos de acercarnos a la fauna presente en el municipio de Pamplona asociada a los ríos, a lo que denominamos en términos generales la fauna acuática.
Autores: Galicia, David, (Editor); Miranda, Rafael, (Editor)
2011 
As a result of the European Commission¿s concern for the status of continental waters, and as a clear reflection of the notion of water as heritage to be conserved, in the year 2000 the Water Framework Directive (2000/60/CE) was enacted, its goal being to establish a framework to protect water and the different aquatic ecosystems by requiring the Member States to achieve a good ecological status in all their waters by 2015. Like all ecosystems, freshwater ecosystems undergo physical, chemical and energy-related changes, both of natural and anthropogenic origin. These disturbances affect the organisms living in them and those who utilize their resources. Therefore, evaluating these changes has become a very important task in order to better understand aquatic systems. The study and analysis of the ecological status of these ecosystems in relation to their conservation status and water quality is thus a fundamental tool for a more efficient and rational management of their resources, that is, a management that does not threaten the ecosystem. The present guide for the identification of Spanish freshwater macroinvertebrates aims to facilitate the job of those who go to great lengths to identify them in order to then determine biotic indices. It is not the aim of this book to serve as a zoological treaty, nor does it claim to add new information on the biology or the ecology of the taxa covered. This book is, simply, a working tool explicitly designed to facilitate the identification of the Spanish macroinvertebrates and the subsequent computing of biotic indices.
Autores: Galicia, David; Miranda, Rafael;
2011 

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Rafael Miranda is Associate Professor at the Department of Environmental Biology at the University of Navarra. His research area is Biology and Ecology of freshwater fishes, focused on conservation biology and the analysis of freshwater ecological indicators. He is founder member and treasurer of the Iberian Society of Ichthyology and was member o the External Affairs Committee of the American Fisheries Society. He served as Associate Dean of professors, postgraduate and research at the School of Sciences at the University, during the period 2013-2019.