Earlier arrival of some farmland migrants in western Poland |
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Authors: | Piotr Tryjanowski Stanisaw Kuniak & Tim Sparks |
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Institution: | Department of Avian Biology &Ecology, Adam Mickiewicz University, Fredry 10, PL-61701 Poznañ, Poland;NERC Centre for Ecology and Hydrology, Monks Wood, Abbots Ripton, Huntingdon, Cambridgeshire PE28 2LS, UK |
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Abstract: | A dataset consisting of observations on the first arrival dates (FAD) of 16 species of birds from a locality in western Poland during the period 19131996 is presented and analysed. For 14 of the 16 species, there is evidence of a trend towards earliness in recent years. In the 19701996 period this trend was significant for Pied Wagtail, Wood Pigeon, Black Redstart and Barn Swallow, and marginally significant for a further four species: European Serin, Blackcap, Common Nightingale and Red-backed Shrike. Only two species showed the opposite trend in the 19701996 period: Lesser Whitethroat and Whinchat, of which only the former is (marginally) significant. The trend towards earliness was more pronounced for short-distance (European) migrants than for long-distance (African) migrants. Short-distance migrants generally displayed a correlation with spring temperatures in the breeding locality, a feature less obvious in the long-distance migrants. |
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