publication . Article . 2017

Testis size variation within sneaker males of the dusky frillgoby Bathygobius fuscus (Gobiidae): effects of within-tactic competition

Kawase, Shoma; Hayashi, Takahiro; Matsumoto, Yukio; Takegaki, Takeshi;
Open Access English
  • Published: 01 Oct 2017 Journal: Biological Journal of the Linnean Society, volume 122, issue 2, pages 394-399 (issn: 0024-4066, Copyright policy)
  • Publisher: Oxford University Press
Abstract
A ‘sneaking tactic’ is an alternative reproductive strategy that usually results in sperm competition among males with different tactics. Relatively large testes are a sneaker-specific trait that has generally been thought to have evolved due to sperm competition between sneaker males and bourgeois (guarding) males. However, here we show that competition among sneaker males can also affect testis enlargement in the dusky frillgoby (Bathygobius fuscus) sneaker males. The competitive advantage of focal sneaker males was experimentally manipulated by placing them in tanks with either relatively smaller or larger males. Testis enlargement was conspicuous in focal ma...
Subjects
free text keywords: alternative reproductive tactics, goby, sneaking, sperm competition, testis
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Article . 2017
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