Extended exposure to elevated temperature affects escape response behaviour in coral reef fishes

Warren, Donald T., Donelson, Jennifer M., and McCormick, Mark I. (2017) Extended exposure to elevated temperature affects escape response behaviour in coral reef fishes. PeerJ, 5. e3652.

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The eat of predation, and the prey's response, are important drivers of community dynamics. Yet environmental temperature can have a significant effect on predation avoidance techniques such as fast-start performance observed in marine fishes. While it is known that temperature increases can influence performance and behaviour in the short-term, little is known about how species respond to extended exposure during development. We produced a startle response in two species of darnselfish, the lemon damsel Pomacentrus moluccensis, and the Arnbon darnselfish Pomacentrus amboinensis, by the repeated use of a drop stimulus. We show that the length of thermal exposure of juveniles to elevated temperature significantly affects this escape responses. Short-term (4d) exposure to warmer ternperature laffected directionality and responsiveness for both species. After long-term (90d) exposure, only P. moluccensis showed beneficial plasticity, with directionality returning to control levels. Responsiveness also decreased in both species, possibly to compensate for higher temperatures. There was no effect of temperature or length of exposure on latency to react, maximum swimming speed, or escape distance suggesting that the physical ability to escape was maintained. Evidence suggests that elevated temperature may impact some fish species through its effect on the behavioural responses while under threat rather than having a direct influence on their physical ability to perform an effective escape response.

Item ID: 51396
Item Type: Article (Research - C1)
ISSN: 2167-8359
Keywords: temperature, fast-start response, climate change, coral reef fish, predator-prey
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Copyright 2017. Warren et al. Distributed under Creative Commons CC-BY 4.0 [https://creativecommons.org/licenses/by/4.0/].

Funders: James Cook University (JCU), University of Technology Sydney (UTS), Ian Potter Foundation (IPF), ARC Centre of Excellence for Coral Reef Studies (CECRS)
Date Deposited: 01 Nov 2017 07:34
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 50%
31 BIOLOGICAL SCIENCES > 3199 Other biological sciences > 319902 Global change biology @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 50%
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