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Wired: impacts of increasing power line use by a growing bird population
Moreira, Francisco; Encarnação, Vitor; Rosa, Gonçalo; Gilbert, Nathalie; Infante, Samuel; Costa, Julieta; D'Amico, Marcello; Martins, Ricardo C.Power lines are increasingly widespread across many regions of the planet. Although these linear infrastructures are known for their negative impacts on bird populations, through collision and electrocution, some species take advantage of electricity pylons for nesting. In this case, estimation of the net impact of these infrastructures at the population level requires an assessment of trade-offs between positi...
Long-term declines of wader populations at the Tagus estuary, Portugal: A respo...
Catry, Teresa; Alves, José A.; Andrade, Joana; Costa, Helder; Dias, Maria P.; Fernandes, Pedro; Leal, Ana; Lourenço, Pedro Miguel; Martins, Ricardo C.Migratory wader populations face global threats, mainly related to increasing rates of habitat loss and disturbance driven by human activities. To a large extent, the long-term survival of these populations requires the conservation of networks of sites along their migratory flyways. The Tagus estuary, Portugal, is among the most important wetlands for waders in the East Atlantic Flyway. Annual winter wader cou...
Ducks and the risk of avian influenza in Portugal
Fabião, António; Rodrigues, David; Figueiredo, Maria Ester; Encarnação, VitorThe outbreak of highly pathogenic avian influenza of the H5N1 virus subtype in Western European countries induced the fear that it could reach Portugal through wild bird migration. Ducks, geese and swans are some of the bird groups with higher prevalence of influenza virus that might be vectors of virus dissemination, considering the existing studies on low pathogenic subtypes that are common in nature (Olsen e...
Are long-distance migrant passerines faithful to their stopover sites?
Catry, Paulo; Encarnação, Vitor; Araújo, António; Fearon, Peter; Fearon, Anne; Armelin, Michael; Delaloyle, PeterLong-distance migrant passerines are well known to often display high levels of philopatry to breeding and wintering grounds. One could expect that similar selective pressures and similar navigation skills would result in their being faithful to stopover sites, a pattern that has been described for several populations of migratory waders and waterfowl. In this paper, we develop the argument that passerines shou...