Trends in Abundance of Migrating Raptors at Gibraltar in Spring

Publication Type:Journal Article
Year of Publication:2007
Authors:BENSUSAN, KEITHJ, Garcia, EFJ, Cortes, JE
Journal:Ardea
Volume:95
Issue:1
Date Published:2007
ISBN Number:0373-2266
Keywords:Accipiter, Accipiter nisus, Accipitridae, Africa, Aquila, Aquila pennata, Aquila pennatus, Buteo, Buteo buteo, Europe, Gibraltar, Hieraaetus, Hieraaetus pennatus, Milvus, Milvus korschun, Milvus migrans, Netherlands, Nisus, Passer, Passer montanus, Passeridae, Pernis, Pernis apivorus, Western Europe
Abstract:Raptor migration has been monitored regularly at Gibraltar since the mid-1960s. Long-term trends in abundance of spring migration were investigated for the ten most frequent species, five of which changed significantly in abundance during the study period. Black Kites Milvus migrans, Eurasian Sparrowhawks Accipiter nisus and Booted Eagles Hieraaetus pennatus increased. The trends for these three species correspond with those observed elsewhere in western Europe. European Honey-buzzards Perms apivorus and Common Buzzards Buteo buteo, whose western European populations are described as stable, both decreased. For Common Buzzards at least this discrepancy appears to represent a shift in wintering distribution, possibly as a result of climate change, with populations that wintered formerly in North Africa now wintering closer to their breeding grounds.Raptor migration has been monitored regularly at Gibraltar since the mid-1960s. Long-term trends in abundance of spring migration were investigated for the ten most frequent species, five of which changed significantly in abundance during the study period. Black Kites Milvus migrans, Eurasian Sparrowhawks Accipiter nisus and Booted Eagles Hieraaetus pennatus increased. The trends for these three species correspond with those observed elsewhere in western Europe. European Honey-buzzards Perms apivorus and Common Buzzards Buteo buteo, whose western European populations are described as stable, both decreased. For Common Buzzards at least this discrepancy appears to represent a shift in wintering distribution, possibly as a result of climate change, with populations that wintered formerly in North Africa now wintering closer to their breeding grounds.
URL:http://dx.doi.org/10.5253/078.095.0109
Short Title:Ardea
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