Manipulation of photoperiod perception advances gonadal growth but not laying date in the great tit

Lucia Salis, Samuel Caro, Roelof A. Hut, Louis Vernoij & Marcel E. Visser
In seasonal environments, organisms use biotic and abiotic cues to time various biological processes that are crucial for growth, survival and reproductive success. Photoperiod is the best-known cue used to regulate gonadal development, migration and moult of many animal species. In birds, the relationship between photoperiod and gonadal development is clearly established, but we have little understanding on whether photoperiod also regulates actual timing of egg laying under natural conditions. Elucidating the link between photoperiod...
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