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Proc Biol Sci. Feb 7, 2004; 271(1536): 279–283.
PMCID: PMC1691594

Does predation maintain eyespot plasticity in Bicyclus anynana?

Abstract

The butterfly Bicyclus anynana exhibits phenotypic plasticity involving the wet-season phenotype, which possesses marginal eyespots on the ventral surface of the wings, and the dry-season form, which lacks these eyespots. We examined the adaptive value of phenotypic plasticity of B. anynana in relation to the defence mechanisms of crypsis and deflection. We assessed the visibility differences between spotless and spotted butterflies against backgrounds of brown (dry season) or green (wet season) leaves. Spotless butterflies were highly cryptic and less predated by adult bird predators than were spotted ones when presented against brown leaf litter. However, the advantage of crypsis disappeared in the wet-season habitat as both forms were equally visible. In later experiments, naive birds presented with resting butterflies in the wet-season habitat tended to learn more rapidly to capture spotless butterflies, suggesting a slight selective advantage of possessing eyespots. Moreover, marginal eyespots increased significantly the escape probability of butterflies that were attacked by naive birds compared to those attacked by adult birds, although there were no differences in prey capture success within naive predators. Our results show that natural selection acts against eyespots in the dry season, favouring crypsis, whereas in the wet season it may favour eyespots as deflective patterns.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Brakefield PM, Gates J, Keys D, Kesbeke F, Wijngaarden PJ, Monteiro A, French V, Carroll SB. Development, plasticity and evolution of butterfly eyespot patterns. Nature. 1996 Nov 21;384(6606):236–242. [PubMed]
  • Breuker Casper J, Brakefield Paul M. Female choice depends on size but not symmetry of dorsal eyespots in the butterfly Bicyclus anynana. Proc Biol Sci. 2002 Jun 22;269(1497):1233–1239. [PMC free article] [PubMed]
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