4 documents found, page 1 of 1
Fishways in Portugal: status, main findings and research needs
Santos, J.M.; Quaresma, A.L.; Romão, F.; Amaral, S.D.; Mameri, D.; Santo, M.; Bochechas, J.; Telhado, A.; Godinho, F.N.; Pádua, J.; Pinheiro, P.J.Anthropogenic barriers fragment Portuguese rivers, threatening endemic freshwater fish communities. This study compiled national inventories and peer-reviewed research (2002–2024) to quantify fishway implementation, evolution and typology, while evaluating fish performance from published research. One hundred fishways built between 1950 and 2024 were recorded, half of which were constructed after the implementa...
Widespread hybridization between Invasive bleak (Alburnus alburnus) and Iberian...
Curto, M.; Morgado-Santos, M.; Alexandre, C.M.; Alves, M.J.; Gante, H.F.; Gkenas, C.; Medeiros, J.P.; Pinheiro, P.J.; Almeida, P.R.; Magalhães, M.F.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...
Complex size-dependent habitat associations in potamodromous fish species
Santos, J.M.; Reino, L.; Porto, M.; Oliveira, J.; Pinheiro, P.J.; Almeida, P.R.; Cortes, R.; Ferreira, M.T.Knowledge of the distribution of species life stages at multiple spatial scales is fundamental to both a proper assessment of species management and conservation programmes and the ability to predict the consequences of human disturbances for river systems. The habitat requirements of three native cyprinid species—the Iberian barbel Barbus bocagei Steindachner, the Iberian straight-mouth nase Pseudochondrostoma...
Monitoring fish passes using infrared beaming: a case study in an Iberian river
Santos, J.M.; Pinheiro, P.J.; Ferreira, M.T.; Bochechas, J.An application of a new automated fish counting device – the Riverwatcher System (RW) – was used to monitor upstream fish movements in a pool-and-weir fish pass in the River Zeˆ zere, Portugal, for 141 days from June 2002 to May 2003. Fish populations were also collected downstream using multimesh gillnets (5 different mesh sizes ranging from 30 mm to 85 mm knot to knot; ratio between mesh sizes of about 1.30) ...