Metabolism, oxidative stress and territorial behaviour in a female colour polymorphic cichlid fish
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Intrasexual selection on body coloration is thought to play an important role in the evolution of colour polymorphism, but its physiological underpinnings have received limited attention. In the colour polymorphic cichlid Neochromis omnicaeruleus, three fully sympatric female colour morphs—a plain morph (P) and two conspicuously coloured blotched morphs, black-and-white blotched (WB) and orange blotched (OB)—differ in agonistic behaviour. We compared routine metabolic rate (when females were housed in social isolation), short-term energetic costs of interacting with a same-colour rival housed in an adjacent transparent chamber and oxidative stress between the three female colour morphs. WB females had a lower routine metabolic rate compared with the other colour morphs. WB females also had a lower active metabolic rate during inter-female interactions than OB females, while OB females used more oxygen per unit aggressive act than the other two colour morphs. However, there were no consistent differences in oxidative stress between the three morphs. Concerted divergence in colour, behaviour and metabolism might contribute to the evolution of these polymorphisms in sympatry.
KeywordsMetabolic costs Oxidative stress Female-female competition Sexual selection Cichlid fish Lake Victoria
Graham Law, John Laurie, Graham Adam and Alister Kirk helped maintain fish populations in Glasgow. We thank David Bailey for lending his respirometer equipment, technical assistance and discussions. We thank two anonymous reviewers for their useful comments on earlier versions of the manuscript. The research was supported by a postdoctoral fellowship from NWO (Rubicon-grant) and a Marie Curie Fellowship grant to PDD and NERC grant NE.K00400X/1 to NBM, who was also funded by ERC Advanced Grant 332784 during the writing of this paper.
Compliance with ethical standards
All experiments were carried out under UK Home Office Project License PPL 60/3625. from the University of Glasgow and complied with current laws in The UK.
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