Kin selection does not explain male aggregation at leks of 4 manakin species |
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Authors: | Loiselle Bette A; Ryder Thomas B; Duraes Renata; Tori Wendy; Blake John G; Parker Patricia G |
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Institution: | Department of Biology and International Center for Tropical Ecology, One University Boulevard, University of Missouri-St Louis, St Louis, MO 63121, USA |
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Abstract: | In lek-mating systems, males aggregate at display arenas andfemales visit solely for the purpose of mating. This breedingsystem is characterized by high variance in male mating successwith one male often receiving most copulations. High reproductiveskew among males has led to question why males join leks whentheir chances of reproductive success are so low. Kin selectionhas been invoked as a mechanism to explain the evolution oflekking behavior, whereby nonreproducing but genetically relatedmales gain indirect inclusive-fitness benefits. Evidence forkin selection among lek-mating birds is, however, mixed. Here,we show that kin selection is unlikely to be an important explanationfor evolution of lekking behavior in manakins (Aves: Pipridae).We found that for 4 species chosen from several major cladeswithin Pipridae, males within leks were not significantly morerelated than expected from random assortment of males in thepopulation. This means that nonreproducing males do not gainindirect inclusive-fitness benefits by joining leks. This resultsuggests alternative mechanisms must be invoked to explain theevolution of lek-mating systems in manakins. |
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Keywords: | genetic relatedness kin selection lek breeding manakin pipridae |
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