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Identifier |
000369219 |
Title |
Τροφική οικολογία του Νανόμπουφου (Asio otus) στον κάμπο της Μεσαράς (κεντρική Κρήτη) |
Alternative Title |
Food ecology of Asiotus in the valley of Mesara |
Author
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Κοντογεώργιος, Γιάννης
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Thesis advisor
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Μυλωνάς, Μωυσής
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Abstract |
In this study we focus on the foraging and feeding ecology of the Long-eared owl (Asio otus) in the Mesara plain (central Crete) during winter. Diet composition was investigated by analyzing pellets collected in a roost while diet specialization by comparing proportion frequencies of prey species detected in the pellets and their availability in the study area. The daily food intake rate of the owls was examined by feeding experiments of captive kept individuals and pellet abundance collected from the study roost. Foraging behavior was pursued by field observations and tracking radio-tagged individuals. The species feeds primarily on small mammals (90%), specializing on certain rodent species (i.e Apodemus spp.). Its foraging habitat comprises of agrosystems with low vegetation cover with scattered trees (mainly olive groves) and a high population density of rodents. The foraging radius ranges from 800m to 3000m distance form the roosts. The key difference, in comparison with other nocturnal predators, the Long-eared owl selects tall trees for roosting and nesting and is highly gregarious during the winter period. More specifically the study roost consisting of a singe tree hosted 11-45 individuals throughout the winter (October-February) which is the highest number reported in the literature for Europe.
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Language |
Greek |
Subject |
Energy requirements |
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Owis |
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Vital area |
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Γλαύκες |
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Ενεργειακές απαιτήσεις |
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Ζωτικός χώρος |
Issue date |
2011-11-18 |
Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/2/b/d/metadata-dlib-t59pl9s2hfmuuqisimdv36sal1_1319532655.tkl
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Views |
374 |