Clutch-size variation in the Pied Flycatcher Ficedula hypoleuca |
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Authors: | ANTERO JÄ RVINEN |
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Affiliation: | Kilpisjärvi Biological Station, University of Helsinki, Arkadiankatu 7, SF-00100 Helsinki, Finland |
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Abstract: | Variation in clutch-size of the Pied Flycatcher Ficedula hypoleuca was studied simultaneously in relation to latitude, longitude, altitude, laying date and habitat, using data from 103 areas from north Africa to north Norway (latitudinal range about 3900 km). Clutch-size variation was significantly related to altitude and habitat, small clutches being laid at high altitude and in coniferous forests. In contrast to some earlier studies, latitudinal or longitudinal clutch-size trends were not found. |
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