Naturwissenschaften

, 97:53 | Cite as

Release from bats: genetic distance and sensoribehavioural regression in the Pacific field cricket, Teleogryllus oceanicus

  • James H. Fullard
  • Hannah M. ter Hofstede
  • John M. Ratcliffe
  • Gerald S. Pollack
  • Gian S. Brigidi
  • Robin M. Tinghitella
  • Marlene Zuk
ORIGINAL PAPER

Abstract

The auditory thresholds of the AN2 interneuron and the behavioural thresholds of the anti-bat flight-steering responses that this cell evokes are less sensitive in female Pacific field crickets that live where bats have never existed (Moorea) compared with individuals subjected to intense levels of bat predation (Australia). In contrast, the sensitivity of the auditory interneuron, ON1 which participates in the processing of both social signals and bat calls, and the thresholds for flight orientation to a model of the calling song of male crickets show few differences between the two populations. Genetic analyses confirm that the two populations are significantly distinct, and we conclude that the absence of bats has caused partial regression in the nervous control of a defensive behaviour in this insect. This study represents the first examination of natural evolutionary regression in the neural basis of a behaviour along a selection gradient within a single species.

Keywords

Neuroethology Genetic isolation Evolution Sensory ecology Island biology 

Supplementary material

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • James H. Fullard
    • 1
  • Hannah M. ter Hofstede
    • 1
    • 5
  • John M. Ratcliffe
    • 2
  • Gerald S. Pollack
    • 3
  • Gian S. Brigidi
    • 3
  • Robin M. Tinghitella
    • 4
    • 6
  • Marlene Zuk
    • 4
  1. 1.Department of BiologyUniversity of Toronto MississaugaMississaugaCanada
  2. 2.Center for Sound Communication, Institute of BiologyUniversity of Southern DenmarkOdense MDenmark
  3. 3.Department of BiologyMcGill UniversityMontrealCanada
  4. 4.Department of BiologyUniversity of California-RiversideRiversideUSA
  5. 5.School of Biological SciencesUniversity of BristolBristolUK
  6. 6.Department of Ecology and Evolutionary BiologyUniversity of MichiganAnn ArborUSA

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