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Habitat selection of woodchat shrikes Lanius senator during spring stopover is related to foraging strategy

Current Zoology 2017年第2期63卷 139-149页

作者： Danai PAPAGEORGIOU Christos BARBOUTIS Christina KASSARA Sinos GIOKAS Department of Biology University of Patras Panepistimioupoli Patras GR -26500 Greece Antikythira Bird Observatory Hellenic Ornithological Society Themistokleous 80 Athens GR-10681 Greece

Every spring a huge number of passerines cross the Sahara Desert and the mediterranean Sea on their way to their breeding grounds. Stopover sites after such extended barriers where birds can rest, refuel, and find shelter from adverse weather, are of crucial importance for the outcome of their migration. Stopover habitat selection used by migrating birds depends on landscape context, habitat patch characteristics, as well as on the particular energetic conditions and needs of individ- ual birds, but it is still poorly investigated. We focused on a long-distance migrating passerine, the woodchat shrike, in order to investigate for the first time the species＇ habitat selection at a spring stopover site （island of Antikythira, Greece） after the crossing of the Sahara Desert and mediterranean Sea. We implemented radio-tracking, color-ringing, and visual behavioral observa- tions to collect data on microhabitat use. Generalized Linear Mixed Models were developed to identify the species＇ most preferred microhabitat during its stopover on this low human disturbed island. We found that high maquis vegetation surrounded by low vegetation was chosen as perches for hunting. Moreover, high maquis vegetation appeared to facilitate hunting attempts toward the ground, the most frequently observed foraging strategy. Finally, we discuss our find- ings in the context of conservation practices for the woodchat shrike and their stopover sites on mediterranean islands.

关键词： habitat selection mediterranean ecosystem radio-tracking stopover ecology woodchat shrike Lanius senator.

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