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is earlier spring migration of tatarstan warblers expected under climate warming?we analysed data on the arrival dates of four species of leaf warbler (genus phylloscopus) collected in tatarstan between 1957 and 2004. there was no evidence over the whole period that the warblers returned to their breeding sites significantly earlier, mainly because local temperatures for april and may, months when the majority of birds arrived from their wintering grounds, did not increase significantly. however, arrival dates of two species (chiffchaff p. collybita and willow warbler p.troc ...200717265037
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