Arrival dates of male and female willow warblers (Phylloscopus trochilus) to their breeding site in Sweden 1979-2016

Johanna Hedlund, Thord Fransson, Cecilia Kullberg, Jan-Olov Persson & Sven Jakobsson
Protandry is a widespread life-history phenomenon describing how males precede females at the site or state of reproduction. In migratory birds, protandry has important influence on individual fitness, the migratory syndrome and phenological response to climate change. Despite its significance, accurate analyses on the dynamics of protandry using data sets collected at the breeding site, are lacking. Basing our study on records collected daily, spanning a period of 38 years, we aim to investigate protandry...
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