Testes mass and reproductive mode of minnows |
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Authors: | M Pyron |
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Institution: | (1) Illinois Natural History Survey, Center for Biodiversity, 607 E. Peabody Drive, Champaign, IL 61820, USA, US |
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Abstract: | Most comparative analyses of relative testes mass find that testes are larger in species in which more sperm competition is
predicted (multiple males mate with individual females). I tested for differences in adjusted testes mass (for body mass)
by spawning mode and by sexual size dimorphism in a comparative analysis of 37 minnow species. No significant differences
were found for testes mass by spawning mode or sexual size dimorphism. These results imply a lack of response to selection
on testes size from sperm competition in minnow species. Possible explanations for the lack of the expected relationship between
testes mass and mating systems in minnows are presented.
Received: 8 November 1999 / Received in revised form: 27 January 2000 / Accepted: 13 February 2000 |
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Keywords: | Minnows Testes Sperm competition Sexual size dimorphism |
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