Rapid and repeated divergence of animal chemical signals in an island introduction experiment

Colin M. Donihue*, Anthony Herrel, José Martín, Johannes Foufopoulos, Panayiotis Pafilis, Simon Baeckens

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Studies of animal communication have documented myriad rapid, context-dependent changes in visual and acoustic signal design. In contrast, relatively little is known about the capacity of vertebrate chemical signals to rapidly respond, either plastically or deterministically, to changes in context. 

Four years following an experimental introduction of lizards to replicate experimental islets, we aimed to determine if chemical signal design of the experimental populations differed from that of the source population. 

In 2014, we translocated Podarcis erhardii lizards from a large, predator-rich island to each of five replicate predator-free islets. Mean population densities increased fivefold over the following 4 years and bite scars suggest significantly more intraspecific fighting among these experimental populations. In 2018, we analysed the chemical signal design of males in each of the experimental populations and compared it to the chemical signals of the source population. 

We found that males consistently presented a significantly more complex chemical signal compared to the source population. Moreover, their chemical signals were marked by high proportions of octadecanoic acid, oleic acid and α-tocopherol, the three compounds that are known to be associated with lizard territoriality and mate choice. 

Our island introduction experiment thus suggests that the chemical signal design of animals can shift rapidly and predictably in novel ecological contexts.

Original languageEnglish
Pages (from-to)1458-1467
Number of pages10
JournalJournal of Animal Ecology
Volume89
Issue number6
DOIs
Publication statusPublished - Jun 2020

Keywords

  • chemical signal design
  • experimental evolution
  • Lacertidae
  • phenotypic plasticity

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