Brouwer, Lyanne; Groothuis, Ton; Vedder, Oscar; Eikenaar, Cas; Richardson, David S.; Komdeur, Jan
Knowing why certain individuals refrain from reproduction is fundamental to our understanding of the evolution of cooperative breeding. Although many studies have focused on the role of life history and ecological factors, the proximate mechanisms underlying this behaviour have received considerably less attention. We determined the natural variation in plasma testosterone (T) level and cloacal protuberance (CP) size - an indication of sperm storage - in successfully reproducing primary male...[Show more]
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