Land birds; occurrence; stream weirs: point counts; winter; breeding; migration period
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The dataset contains records of land birds (Aves) collected in the lower valley of River Sabor (NE Portugal), in the scope of the long-term Ecological Monitoring Program (PME) of the Baixo Sabor Hydroelectric Dams (AHBS), promoted by EDP – Energias de Portugal, S.A. This dataset includes results of surveys made in and around the area affected by the dams, from February 2010 to September 2014. Sampling was performed close to extant stream weirs, as well as close to locations where weirs were planned to be built in the future under the mitigation program of AHBS. The presence and identity of bird species were assessed by visual and/or acoustic observation, with the support of binoculars. The records include taxa identified at the species or genus levels.