NDLI: Social stimulation, nuptial colouration, androgens and immunocompetence in a sexual dimorphic cichlid fish

Content Provider	Springer Nature Link
Author	Dijkstra, Peter D. Hekman, Renske Schulz, Rüdiger W. Groothuis, Ton G. G.
Copyright Year	2006
Abstract	The nature of the costs maintaining honesty of sexual signalling in inter- and intrasexual interactions remains a contentious issue. For carotenoid-based colour ornaments, it has been hypothesized that the honesty of the signal is enforced when carotenoid allocation to colour expression is traded off against carotenoid availability for immunocompetence. In addition, honesty is enforced if androgens required for colour expression are immunosuppressive. We tested whether there is a trade-off between colour expression and immunocompetence in a lek-breeding haplochromine cichlid fish, Pundamilia nyererei, from Lake Victoria with a carotenoid-based nuptial dress. First, we showed that expression of red nuptial colouration and social rank in a group were positively correlated. We then successfully manipulated the level of colour advertisement by socially stimulating individually housed males with a rival male: Stimulated males developed larger areas of red nuptial colouration and had higher levels of circulating 11-ketotestosterone (11-KT) than non-stimulated males. We subsequently tested the humoral immune response to a novel antigen (sheep red blood cells). There was no overall significant effect of social stimulation on antibody production, but in the stimulated males, the degree of red colouration and the antibody response were negatively correlated. This significant interaction between colour and treatment thus shows that the negative correlation between colouration and antibody production is dependent on the (manipulated) social environment. This study provides correlational and experimental evidence for a trade-off between expression of a sexual trait and one component of immune function in fish. We found no evidence for a direct effect of 11-KT on antibody production, and we discuss alternative mechanisms that could mediate the trade-off.
Starting Page	599
Ending Page	609
Page Count	11
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	61
Issue Number	4
e-ISSN	14320762
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-11-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immunocompetence Sexual selection Male–male competition Cichlid fish Lake Victoria Zoology Behavioural Sciences
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Social stimulation, nuptial colouration, androgens and immunocompetence in a sexual dimorphic cichlid fish (2007).

Original article social stimulation, nuptial colouration, androgens and immunocompetence in a sexual dimorphic cichlid fish.

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Social stimulation, nuptial colouration, androgens and immunocompetence in a sexual dimorphic cichlid fish

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Social stimulation, nuptial colouration, androgens and immunocompetence in a sexual dimorphic cichlid fish (2007).

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