A two-second delay confers first-male fertilization precedence within in vitro 
sperm competition experiments in Atlantic salmon

Yeates, S.; Searle, J.; Ward, R. G.; Gage, M. J. G.

doi:10.1111/j.1095-8649.2006.01294.x

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A two-second delay confers first-male fertilization precedence within in vitro sperm competition experiments in Atlantic salmon

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Yeates, S.
Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Yeates, S., Searle, J., Ward, R. G., & Gage, M. J. G. (2007). A two-second delay confers first-male fertilization precedence within in vitro sperm competition experiments in Atlantic salmon. Journal of Fish Biology, 70(1), 318-322. doi:10.1111/j.1095-8649.2006.01294.x.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-D7EC-5

Abstract

In vitro paired-male sperm competition experiments in Atlantic salmon Salmo salar for a single female's eggs revealed that 2 s delays in sperm release caused significant reductions in paternity, with second males achieving only 30% fertilization success (against an expected 50%). This first-male fertilization precedence supports previous work suggesting that sperm competition follows the principles of a race in Atlantic salmon, and suggests that any timing asymmetry in sperm release within natural competitive spawnings could have significant consequences for male fertilization success.