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Intricate covariation between exploration and avoidance learning in a generalist predator

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  • Chi-Yun Kuo
  • Hao-En Chin
  • Yu-Zhe Wu

Abstract

Many predators avoid unprofitable prey by learning to use visual features of the prey as reliable indicators of quality. However, individual variation in avoidance learning is rarely examined in detail. It has been hypothesized that better avoidance learning ability might correlate with faster exploration tendency, but available data are limited in both quantity and scope. In this study, we examined the covariation between exploration, foraging decisions, and avoidance learning in a generalist lizard Eutropis multifasciata to test the prediction that faster explorers are also better avoidance learners. We also examined how sex, population, and color of unpalatable prey might mediate the exploration-avoidance learning covariation. We collected data on exploration and foraging behavior in individuals from two allopatric populations and quantified changes in foraging decisions over five daily learning trials, in which individuals were presented with normal- and bitter-tasting prey that differed consistently in color. Even though bitter prey elicited strong negative responses, lizards overall did not avoid consuming fewer such prey with learning. Instead, they learned to prioritize on palatable prey as the experiment progressed. In concordance with our prediction, we found that faster explorers were generally better avoidance learners, even though sex, population, and prey color were also important. Our study represents a rare experimental test of the exploration-avoidance learning covariation, especially in non-avian systems. Our results suggest that unpalatability might be an ineffective defense against generalist predators such as E. multifasciata and that faster explorers might impose stronger selection for the evolution of warning signals in unprofitable prey.

Suggested Citation

  • Chi-Yun Kuo & Hao-En Chin & Yu-Zhe Wu, 2023. "Intricate covariation between exploration and avoidance learning in a generalist predator," Behavioral Ecology, International Society for Behavioral Ecology, vol. 34(4), pages 708-717.
  • Handle: RePEc:oup:beheco:v:34:y:2023:i:4:p:708-717.
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    References listed on IDEAS

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    1. Craig A. Barnett & John Skelhorn & Melissa Bateson & Candy Rowe, 2012. "Educated predators make strategic decisions to eat defended prey according to their toxin content," Behavioral Ecology, International Society for Behavioral Ecology, vol. 23(2), pages 418-424.
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    3. Hannah M. Rowland & Tom Hoogesteger & Graeme D. Ruxton & Michael P. Speed & Johanna Mappes, 2010. "A tale of 2 signals: signal mimicry between aposematic species enhances predator avoidance learning," Behavioral Ecology, International Society for Behavioral Ecology, vol. 21(4), pages 851-860.
    4. John Skelhorn & Candy Rowe, 2006. "Do the multiple defense chemicals of visually distinct species enhance predator learning?," Behavioral Ecology, International Society for Behavioral Ecology, vol. 17(6), pages 947-951, November.
    5. Lisa A. Taylor & Zarreen Amin & Emily B. Maier & Kevin J. Byrne & Nathan I. Morehouse, 2016. "Flexible color learning in an invertebrate predator: Habronattus jumping spiders can learn to prefer or avoid red during foraging," Behavioral Ecology, International Society for Behavioral Ecology, vol. 27(2), pages 520-529.
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