Oecologia

, Volume 169, Issue 4, pp 965–973

Ontogenetic shifts in a prey’s chemical defences influence feeding responses of a snake predator

  • John Llewelyn
  • Kris Bell
  • Lin Schwarzkopf
  • Ross A. Alford
  • Richard Shine
Behavioral ecology - Original research

Abstract

Foraging theory suggests that predator responses to potential prey should be influenced by prey chemical defences, but the effects of ontogenetic variation in such defences on prey vulnerability to predators remain unclear. Cane toads (Rhinella marina) are toxic to anurophagous snakes, including the keelback (Tropidonophis mairii, a natricine colubrid that occurs within the toads’ invasive range in Australia). Toxin levels and diversity change through toad ontogeny, decreasing from the egg stage to metamorphosis, then increasing in postmetamorphic toads. If the toxin content of a prey item influences predator responses, we predict that keelbacks should exhibit selective predation on toads close to metamorphosis. The results of our laboratory trials on adult (field-collected, and thus toad-experienced) and hatchling (laboratory-incubated, and thus toad-naive) keelbacks supported this prediction. The snakes selectively consumed later-stage rather than earlier-stage tadpoles, and earlier-stage rather than later-stage metamorphs. Our data are thus consistent with the hypothesis that ontogenetic changes in toxin content can affect individuals’ vulnerability to predation.

Keywords

Chemical defence Ontogeny Optimal foraging Bufo marinus 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • John Llewelyn
    • 1
    • 2
  • Kris Bell
    • 2
  • Lin Schwarzkopf
    • 2
  • Ross A. Alford
    • 2
  • Richard Shine
    • 1
  1. 1.School of Biological SciencesUniversity of SydneySydneyAustralia
  2. 2.School of Marine and Tropical BiologyJames Cook UniversityTownsvilleAustralia

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