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Amaia Angulo Rodeles

Publicaciones científicas más recientes (desde 2010)

Autores: Angulo Rodeles, Amaia (Autor de correspondencia); Galicia Paredes, David; Miranda Ferreiro, Rafael
ISSN 1470-160X  Vol. 117  2020 
Different indices have been developed to quantify the extent and severity of river fragmentation. These indices vary depending on the specific goals of the study. Here, we present a new Conservation Connectivity Index (CCIp) for potamodromous fish species that considers the conservation value (richness, rarity and vulnerability) of river segments. The Iberian Peninsula holds > 20 endemic and endangered potamodromous fish species as well as > 1000 large dams (> 1 hm3 of capacity). The CCIp was calculated for the eight most important river basins of the Iberian Peninsula and compared to the Dendritic Connectivity Index (DCIp) developed by Cote et al. in 2009, which uses only river length as a habitat variable. With the use of both DCIp and CCIp, the dams were analysed and ranked according to their impacts on the river basin. The main results show that Iberian river basins are heavily fragmented, with river basin connectivity percentages of less than 20% in most cases using both DCIp and CCIp. CCIp values are slightly higher than DCIP values in almost all cases. When the impact of individual dams is analysed, differences also appear between the DCIp and CCIp. CCIp highlights the impact of dams located in areas of high fish conservation value while DCIp emphasize the impact of dams fragmenting large river segments.
Autores: Angulo Rodeles, Amaia (Autor de correspondencia); Galicia Paredes, David; Miranda Ferreiro, Rafael
ISSN 0213-8409  Vol. 39  Nº 2  2020  págs. 601 - 619
River connectivity is essential for the correct functioning of freshwater ecosystems at all scales. However, it has not received the necessary attention by researchers, managers and policymakers until recent years. In this review, we recap the state of knowledge in river connectivity and its applications to conservation. We describe the particular characteristics of river connectivity and summarise the effects of its interruption in different freshwater ecosystem elements. We then focus on the effects of the lack of segment connectivity in fish species and review the different methods developed to study it. The application of connectivity in freshwater fish conservation areas is also reviewed, which highlights the lack of studies on this subject. Finally, connectivity restoration is studied. The review addresses these topics in a general way and then focus on the Iberian Peninsula.The Iberian Peninsula is an interesting place to study river connectivity because it has one of the highest numbers of dams per square kilometre and a large number of endemic and endangered freshwater fish species. Despite the high number of fish species affected by water extraction and damming, river connectivity and its effect in Iberian freshwater fish populations have not been well studied. A small number of studies analyse the effect of small dams in nearby fish communities, but large-scale impact assessments are scarce.
Autores: Angulo Rodeles, Amaia (Autor de correspondencia); Leunda Urretavizcaya, Pedro Manuel; Elso, J. ; et al.
ISSN 2044-2041  Vol. 9  Nº 3  2019  págs. 278 - 288
River fragmentation is one of the main threats to diadromous fish species. We aimed to create a new and simple connectivity index to calculate habitat accessibility that considers habitat suitability for fish species, using the Bidasoa River basin in the north of Spain and Atlantic salmon (Salmo salar) as an example. A habitat connectivity index (HCI) was calculated for the river basin using upstream passability and segment length as variables. We then calculated a new habitat quality index for each river segment and multiplied it by river segment length to create the Breeding Habitat Connectivity Index (HCIb). These 2 indices were first calculated using only upstream barrier passability and then by adding downstream passability. In each case, the indices show different outcomes but a similar pattern: in all cases, main-stem obstacles closest to the river mouth most affected the connectivity index, even when habitat quality was considered. Although we cannot compare the indices to the real area used by salmon because spatial tracking was not performed during the study years, we consider that including habitat quality in a river connectivity index adds useful information for scientists and managers.