Abstract:
:Ejaculate attributes are important factors driving the probability of fertilizing eggs. When females mate with several males, competition between sperm to fertilize eggs should accentuate selection on ejaculate attributes. We tested this hypothesis in the North African houbara bustard ( Chlamydotis undulata undulata) by comparing the strength of selection acting on two ejaculate attributes when sperm from single males or sperm from different males were used for insemination. In agreement with the prediction, we found that selection on ejaculate attributes was stronger when sperm of different males competed for egg fertilization. These findings provide the first direct comparison of the strength of selection acting on ejaculate attributes under competitive and non-competitive fertilizations, confirming that sperm competition is a major selective force driving the evolution of ejaculate characteristics.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Vuarin P,Hingrat Y,Lesobre L,Jalme MS,Lacroix F,Sorci Gdoi
10.1098/rsbl.2018.0889subject
Has Abstractpub_date
2019-03-29 00:00:00pages
20180889issue
3eissn
1744-9561issn
1744-957Xjournal_volume
15pub_type
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