Journal
JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 28, Issue 2, Pages 356-367Publisher
WILEY
DOI: 10.1111/jeb.12567
Keywords
behavioural laterality; experience; Poecilia wingei; sidedness; sigmoid display; social environment
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Funding
- Czech Science Foundation [GACR P505/12/G112]
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Lateral asymmetry in signalling traits enables males to strategically exploit their best side. In many animals, both body colouration and fluctuating asymmetry are signals of male attractiveness. We demonstrated experimentally that even sexually naive male Poecilia wingei were able to identify their most attractive side (i.e. that with a higher proportion of carotenoid pigmentation) and use it preferentially during courtship. Notably, males retained their strategic signalling in a male-biased social environment, whereas they ceased to signal strategically in a female-biased environment. The degree of asymmetry in colouration did not affect overall courtship activity. Strategic lateralization in courtship displays was strongest and most repeatable in the male-biased social environment where males competed with rivals for matings. Individual asymmetry in colouration changed considerably over a period of 3months. This suggests that colouration is a dynamic feature during adulthood and that males are capable of tracking and strategically exploiting their lateral asymmetry in accordance with their social environment.
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