As Listas Vermelhas de Espécies Ameaçadas da União Internacional para a Conservação da Natureza constituem indicadores importantes do estado da biodiversidade, e são amplamente utilizadas para informar e estruturar as atividades de conservação. Estas Listas, publicadas em Livros Vermelhos, resultam de um rigoroso processo de avaliação, baseado num sistema de categorias e critérios de diagnóstico do risco de ext...
Assess intraespecific diferences in residency and migration; ii) Assess fidelity to the river of origin; Iii) Identify which environmental variables influence the presence/atraction of individuals downstream Foz Tua dam
O salmão-do-atlântico (Salmo salar L., 1758) é uma espécie piscícola migradora icónica dos ecossistemas aquáticos, com um elevado valor económico e cultural, cuja área de distribuição se localiza desde o mar Báltico até ao norte da Península Ibérica. Em Portugal, as populações de salmão encontram-se no limite sul da sua distribuição e, portanto, em condições sub-ótimas associadas com o regime térmico e variaçõe...
O salmão-do-atlântico (Salmo salar) é uma espécie anádroma emblemática do Hemisfério Norte e autóctone em Portugal. Segundo a IUCN o seu estatuto de conservação global é Pouco Preocupante (LC), mas em Portugal encontra-se classificado como Criticamente em Perigo (CR), sendo provavelmente a população desta espécie mais ameaçada à escala global. A sua abundância na Europa diminuiu em toda a área nativa, fruto de ...
Dam construction and streamflow regulation are increasing throughout the world, with impacts in impounded aquatic ecosystems. Hydropower dams, some of them causing a phenomenon called “hydropeaking” during their operation, are known for having a variety of impacts on downstream aquatic biota, particularly fish, and respective habitat. This can result in significant changes, from the community (e.g., fish assemb...
Hybridization between native and nonnative fish species is a major conservation issue, especially in ecosystems with high levels of endemism, such as Iberian streams. To date, hybridization with the invasive bleak Alburnus alburnus has been reported for the Iberian chub Squalius alburnoides and S. pyrenaicus and in scattered locations only. However, the bleak is spreading in the region, potentially increasing t...
Hybridization between native and nonnative fish species is a major conservation issue, especially in ecosystems with high levels of endemism, such as Iberian streams. To date, hybridization with the invasive bleak Alburnus alburnus has been reported for the Iberian chub Squalius alburnoides and S. pyrenaicus and in scattered locations only. However, the bleak is spreading in the region, potentially increasing t...
The threespine stickleback is a freshwater fish listed as endangered in Portugal, near the southern limit of the species global distribution. However, few measures have been proposed aiming at the conservation of this species in suboptimal environments. From existing databases and specific sampling campaigns, we obtained occurrence data of threespine stickleback for a total of 646 sites. The occurrence data, to...
Hydropeaking is widely known for changing the quantity and quality of the available habitat downstream of hydroelectric facilities, thus affecting all stages of fish life cycles. Hydropeaking impacts on salmonids are widely studied, but knowledge of its effects on cyprinids, which are dominant in Mediterranean areas, is scarce. In this study, 11 Iberian barbel (Luciobarbus bocagei, Steindachner 1864) were tagge...
Atlantic salmon is often a focal species of restoration efforts throughout the north Atlantic and it is therefore an excellent case study for how best to design programmes to address and mitigate threats and correct population declines. This perspective is written to promote the work that has been accomplished towards restoration of Atlantic salmon populations and synthesize how we believe the lessons can be us...