Eyespots deflect predator attack increasing fitness and promoting the evolution of phenotypic plasticity

Kathleen L. Prudic, Andrew M. Stoehr, Bethany R. Wasik, Antónia Monteiro

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Some eyespots are thought to deflect attack away from the vulnerable body, yet there is limited empirical evidence for this function and its adaptive advantage. Here, we demonstrate the conspicuous ventral hindwing eyespots found on Bicyclus anynana butterflies protect against invertebrate predators, specifically praying mantids. Wet season (WS) butterflies with larger, brighter eyespots were easier for mantids to detect, but more difficult to capture compared to dry season (DS) butterflies with small, dull eyespots. Mantids attacked the wing eyespots of WS butterflies more frequently resulting in greater butterfly survival and reproductive success. With a reciprocal eyespot transplant, we demonstrated the fitness benefits of eyespots were independent of butterfly behaviour. Regardless of whether the butterfly was WS or DS, large marginal eyespots pasted on the hindwings increased butterfly survival and successful oviposition during predation encounters. In previous studies, DS B. anynana experienced delayed detection by vertebrate predators, but both forms suffered low survival once detected. Our results suggest predator abundance, identity and phenology may all be important selective forces for B. anynana. Thus, reciprocal selection between invertebrate and vertebrate predators across seasons may contribute to the evolution of the B. anynana polyphenism.

Original languageEnglish (US)
Article number20141531
JournalProceedings of the Royal Society B: Biological Sciences
Volume282
Issue number1798
DOIs
StatePublished - Nov 12 2014
Externally publishedYes

Keywords

  • Adaptive coloration
  • Visual signalling
  • Wing patterns

ASJC Scopus subject areas

  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)

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