Our researchers

Ricardo Ibáñez Gastón

Biología Ambiental
Facultad de Ciencias. Universidad de Navarra
Research lines
Ecología y dinámica de comunidades vegetales, Restauración de espacios degradados, Ecología de poblaciones vegetales

Most recent scientific publications (since 2010)

Authors: Valencia, E. , (Autor de correspondencia); de Bello, F. ; Galland, T. ; et al.
ISSN 0027-8424  Vol. 117  Nº 39  2020  pp. 24345 - 24351
The stability of ecological communities is critical for the stable provisioning of ecosystem services, such as food and forage production, carbon sequestration, and soil fertility. Greater biodiversity is expected to enhance stability across years by decreasing synchrony among species, but the drivers of stability in nature remain poorly resolved. Our analysis of time series from 79 datasets across the world showed that stability was associated more strongly with the degree of synchrony among dominant species than with species richness. The relatively weak influence of species richness is consistent with theory predicting that the effect of richness on stability weakens when synchrony is higher than expected under random fluctuations, which was the case in most communities. Land management, nutrient addition, and climate change treatments had relatively weak and varying effects on stability, modifying how species richness, synchrony, and stability interact. Our results demonstrate the prevalence of biotic drivers on ecosystem stability, with the potential for environmental drivers to alter the intricate relationship among richness, synchrony, and stability.
Authors: Valencia, E., (Autor de correspondencia); De Bello, F.; Leps, J.; et al.
ISSN 1100-9233  Vol. 31  Nº 5  2020  pp. 792 - 802
Questions: Compensatory dynamics are described as one of the main mechanisms that increase community stability, e.g., where decreases of some species on a year-to-year basis are offset by an increase in others. Deviations from perfect synchrony between species (asynchrony) have therefore been advocated as an important mechanism underlying biodiversity effects on stability. However, it is unclear to what extent existing measures of synchrony actually capture the signal of year-to-year species fluctuations in the presence of long-term directional trends in both species abundance and composition (species directional trends hereafter). Such directional trends may lead to a misinterpretation of indices commonly used to reflect year-to-year synchrony. Methods: An approach based on three-term local quadrat variance (T3) which assesses population variability in a three-year moving window, was used to overcome species directional trend effects. This "detrending" approach was applied to common indices of synchrony across a worldwide collection of 77 temporal plant community datasets comprising almost 7,800 individual plots sampled for at least six years. Plots included were either maintained under constant "control" conditions over time or were subjected to different management or disturbance treatments. Results: Accounting for directional trends increased the detection of year-to-year synchronous patterns in all synchrony indices considered.
Authors: Galicia Paredes, David (Autor de correspondencia); Amezcua Martínez, Ana Belén; Baquero Martín, Enrique; et al.
ISSN 2535-0897  Vol. 3  2019  pp. 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".
Authors: Camarero Martínez, J. J.; Gazol Burgos, Antonio; Sangüesa Barreda, G.; et al.
ISSN 2296-701X  Vol. 6  2018  pp. 9
Drought-triggered declines in forest productivity and associated die-off events have increased considerably due to climate warming in the last decades. There is an increasing interest in quantifying the resilience capacity of forests against climate warming and drought to uncover how different stands and tree species will resist and recover after more frequent and intense droughts. Trees form annual growth rings that represent an accurate record of how forest growth responded to past droughts. Here we use dendrochronology to quantify the radial growth of different forests subjected to contrasting climatic conditions in Spain during the last half century. Particularly, we considered four climatically contrasting areas where dominant forests showed clear signs of drought-induced dieback. Studied forests included wet sites dominated by silver fir (Abies alba) in the Pyrenees and beech (Fagus sylvatica) stands in northern Spain, and drought-prone sites dominated by Scots pine (Pinus sylvestris) in eastern Spain and black pine (Pinus nigra) in the semi-arid south-eastern Spain. We quantified the growth reduction caused by different droughts and assessed the short-and long-term resilience capacity of declining vs. non-declining trees in each forest. In all cases, drought induced a marked growth reduction regardless tree vigor. However, the capacity to recover after drought (resilience) at short- and long-term scales varied greatly between declining and non-declining individuals. ..
Authors: Gazol Burgos, Antonio; Uría Díez, Jaime; Elustondo Valencia, David; et al.
ISSN 1100-9233  Vol. 27  Nº 4  2016  pp. 728 - 738
Authors: Uría Díez, Jaime; Gazol Burgos, A.; Ibáñez Gastón, Ricardo
ISSN 0002-9122  Vol. 101  Nº 8  2014  pp. 1286 - 1292
Premise of the study: Plants respond to the prevailing conditions in the surrounding environment, but since they are dynamic systems this response may vary during their life. Thus, the identification of key aspects for the maintenance of plant populations requires the consideration of plant performance across environmental gradients and along life stages. This study examines how abiotic conditions and biotic interactions and processes determine the spatial distribution of two life-story stages that play a key role in the functioning of a representative population of Carex remota. Methods: We used structural equation modeling (SEM) to test for direct and indirect influences of abiotic and biotic factors on seedlings and adults of Carex remota. The variables used in the analysis were number of seedlings, cover of adults, soil moisture, leaf litter cover, relative light, and topographic position. Key results: Population patterns partially depend on direct and indirect effects of abiotic conditions. Whereas adult individuals were only affected by topsoil moisture, seedling emergence was largely affected by multiple environmental conditions. The number of seedlings increased with high topsoil moisture, low leaf-litter values, high light values as well as in low parts of the study area. The importance of adult individuals in determining seedling success is also highlighted: higher abundance provides seed rain in the surroundings and modifies the microenvironmental conditions favoring high seedling establishment. Conclusions: As hypothesized, adults and seedlings responded to the environmental conditions differently. Seedling emergence was a critical aspect in C. remota performance, and abrupt changes in the environment during this stage may strongly influence population performance.
Authors: Uría Díez, Jaime; Ibáñez Gastón, Ricardo
ISSN 1936-0584  Vol. 7  Nº 2  2014  pp. 524 - 531
This work explains the effect of microtopography on the spatio-temporal gradient of topsoil moisture in a first-order stream in a forested mountainous area of northern Spain. This gradient was also related with the availability of suitable microsites for a forest riparian sedge (Carex remota). Topsoil moisture, presence of C. remota and height and distance from the stream edges were measured in 385 points along 35 transects perpendicular to the stream. Soil moisture measurements were repeated in three different dates. Topsoil moisture showed a sigmoid trend that defined the limits of a wet riparian zone at 125m of distance from and 055m in elevation above stream banks. Our riparian zone was narrower than other studies because of the steep slopes (25%) of the mountainous area studied. Elevation above stream banks was more influential than distance in defining the limits of the riparian zone. In the riparian zone, values of soil moisture were high and constant even at the end of a dry period due to the continuous water flow. In the adjacent upland forest, soil moisture varied according to rainfall. These high and constant soil moisture values defined the suitable microsites for C. remota.
Authors: Uría Díez, Jaime; Ibáñez Gastón, Ricardo; Mateu, J
ISSN 1436-3240  Vol. 27  Nº 1  2013  pp. 59-76
This study attempts to understand the dependence on abiotic factors and on the biotic process of the population development. We used three spatial point process models (Poisson, Area-Interaction and shot-noise Cox processes) in both homogenous and inhomogeneous versions to model the distribution of three Carex remota cohorts in wet zones of a temperate forest in the north of Spain. The cohorts studied were adults and seedlings born in two consecutive years. With the use of these models we are able to simulate separately and jointly the effect on plant distribution of a homogeneous or heterogeneous habitat, and the absence or presence of some biotic processes, as seed dispersal and/or density-dependent interactions. The result of the bivariate function analysis does not reveal sufficient evidences, but suggests a weak positive relation between adults and seedlings that survived a dry period in the first summer. Models from the three cohorts show a decreasing degree of clustering from seedlings to adults. Besides, the results show that the importance of the main factors that explain the population structure changes along the development of Carex stages. Compared to seedlings, the adults pattern shows an increasing dependence on abiotic factors.
Authors: Herrero, C.; Uría Díez, Jaime; Ibáñez Gastón, Ricardo; et al.
ISSN 1796-1718  Vol. 25  2013  pp. 47 - 50
Authors: Ibáñez Gastón, Ricardo
ISSN 1136-5048  Vol. 14 - 15  2013  pp. 54
Authors: Ariño Plana, Arturo; Bermejo Orduna, Raúl; Ibáñez Gastón, Ricardo; et al.
ISSN 1238-7312  Nº 18  2011  pp. 53 - 57
Authors: Gazol, A.; Ibáñez Gastón, Ricardo
Journal: Acta Oecologica
ISSN 1146-609X  Vol. 36  Nº 6  2010  pp. 634 - 644
Authors: Gazol Burgos, Antonio; Ibáñez Gastón, Ricardo
Journal: Plant Ecology (Print)
ISSN 1385-0237  Vol. 211  Nº 1  2010  pp. 37 - 48
Authors: Gazol Burgos, Antonio; Ibáñez Gastón, Ricardo
Journal: Plant Ecology (Print)
ISSN 1385-0237  Vol. 207  Nº 1  2010  pp. 1 - 11
Spatial patterns of vascular plant diversity were studied in an unmanaged temperate forest in northern Spain. Diversity in 102 plots of 400 m(2) was analyzed against environmental and spatial variables. The Principal Coordinates of Neighbor Matrices method was used to create spatial variables that represent spatial structures on multiple scales. Variation partitioning on multiple regression was used to discover pure environmental and spatial fractions and their joint effects on diversity. Additionally, we created maps of the response and some explanatory variables to interpret their patterns. The results show that diversity is heterogeneously distributed in the basin and is explained mainly by environmental factors. Leaf litter cover proved the most important environmental factor. The spatial variables play an important role in structuring the environment but the low amount of variance explained by these when the effect of the environment is removed points to the lesser importance of neighborhood relations to the distribution of diversity values.
Authors: Ariño Plana, Arturo; Gimeno, Benjamín S.; Pérez de Zabalza, A.; et al.
Book title:  Nitrogen Deposition and Natura 2000: Science & Practice in determining environmental impacts
2011  pp. 140 - 146

Teaching experience