Summary
Sixty percent of C. nigrofasciatum males showed bigamous behaviour when held in small, outdoor ponds at an adult sex ratio of 5 males to 10 females. No male held more than two pair bonds simultaneously. Bigamy had reproductive benefits; bigamous males, on average, fathered more broods that survived well into the free-swimming fry stage than did monogamous males. In ponds where adult size varied, no positive correlations were found, for either sex, between adult size and frequency of spawning or success of broodrearing, despite predictions that larger size would confer reproductive benefits on both sexes. A significant positive correlation was found between the sizes of mated individuals in the pond where both sexes varied in size. On theoretical grounds this relationship is likely to be more strongly influenced by female than by male choice of spawning partner.
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Keenleyside, M.H.A. Bigamy and mate choice in the biparental cichlid fish Cichlasoma nigrofasciatum . Behav Ecol Sociobiol 17, 285–290 (1985). https://doi.org/10.1007/BF00300148
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DOI: https://doi.org/10.1007/BF00300148