Abstract
Thirteen-lined ground squirrels, Spermophilus tridecemlineatus, show a first-male advantage in sperm competition under field conditions. The hypothesis that this advantage is related to the delay between male matings was tested in a laboratory experiment using individuals of known allozyme genotype. The interval between first and second male matings was varied across a range extending from 0·38 to 3·83 h; observational data on male copulatory behaviour were also examined for the effects of copulation duration on fertilization success. The results indicated that paternity in this standardized situation was best predicted by a combination of two variables: the delay between the males' matings, and the duration of the longest copulation achieved by the second male.
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