Cooperatively breeding cichlid fish adjust their testis size but not sperm traits in relation to sperm competition risk

@article{Awata2008CooperativelyBC,
  title={Cooperatively breeding cichlid fish adjust their testis size but not sperm traits in relation to sperm competition risk},
  author={Satoshi Awata and Tomohiro Takeyama and Yoshimi Makino and Yuko Kitamura and Masanori Kohda},
  journal={Behavioral Ecology and Sociobiology},
  year={2008},
  volume={62},
  pages={1701-1710}
}
Theoretical models predict that in external fertilisers, sperm competition risk selects for larger testes and larger sperm with higher velocity, at the expense of sperm longevity. Although several empirical studies have tested this prediction within a fish species, there has been little evidence that an individual male can adjust his testis size and sperm traits according to the risk of sperm competition. Using the cooperatively breeding cichlid Julidochromis transcriptus, we examined testis… CONTINUE READING

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Living on the wedge: female control of paternity in a cooperatively polyandrous cichlid.

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