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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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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.

Keywords: Salmo salar; external fertilization; fertilization precedence; sperm competition

Document Type: Research Article


Affiliations: 1: Department of Biology, University of York, York YO10 5YW, U.K. 2: School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.

Publication date: January 1, 2007


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