https://www.selleckchem.com/pr....oducts/sgc-cbp30.htm
The initiation of reproduction in many seasonally breeding animals is controlled by photoperiod and tends to be clinal populations at higher latitudes breed later than those at lower latitudes, often reflecting a higher photoperiodic threshold. Migratory animals presumably time reproduction to match conditions at their breeding grounds, at least in part, by cues perceived on their wintering grounds. We asked how closely related dark-eyed junco (Junco hyemalis) populations that overwinter in sympatry but breed in allopatry respond to t
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