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

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-mal...

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Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Yeates, S., Searle, J., Ward, R., Gage, M.
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
Atlantic salmon
Salmo salar
Online Access:http://hdl.handle.net/11858/00-001M-0000-000F-D7EC-5
http://hdl.handle.net/11858/00-001M-0000-000F-D7EB-7
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Summary: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.

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