Duration of exposure to elevated temperature affects competitive interactions in juvenile reef fishes

Warren, Donald T., Donelson, Jennifer M., McCormick, Mark I., Ferrari, Maud C.O., and Munday, Philip L. (2016) Duration of exposure to elevated temperature affects competitive interactions in juvenile reef fishes. PLoS ONE, 11 (10). e1064505. pp. 1-13.

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Climate change will affect key ecological processes that structure natural communities, but the outcome of interactions between individuals and species will depend on their thermal plasticity. We tested how short- and long-term exposure to projected future temperatures affects intraspecific and interspecific competitive interactions in two species of coral reef damselfishes. In conspecific contests, juvenile Ambon damselfish, Pomacentrus amboinensis, exhibited no change in aggressive interactions after 4d exposure to higher temperatures. However, after 90d of exposure, fish showed a nonadaptive reduction in aggression at elevated temperatures. Conversely, 4d exposure to higher temperature increased aggression towards conspecifics in the lemon damselfish, Pomacentrus moluccensis. 90d exposure began to reduce this pattern, but overall there was little effect of temperature. Aggression in interspecific contests increased with short-term exposure, but was significantly lower after long-term exposure indicative of acclimation. Our results show how the length of exposure to elevated temperature can affect the outcome of competitive interactions. Furthermore, we illustrate that results from intraspecific contests may not accurately predict interspecific interactions, which will challenge our ability to generalise the effects of warming on competitive interactions.

Item ID: 46572
Item Type: Article (Research - C1)
ISSN: 1932-6203
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© 2016 Warren et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. https://creativecommons.org/licenses/by/4.0/

Funders: Ian Potter Foundation (IPF), University of Technology Sydney (UTS), Natural Sciences and Engineering Research Council of Canada (NSERC), Australian Research Council Centre of Excellence for Coral Reef Studies (ARC CECRS), College of Marine and Environmental Sciences, James Cook University (JCU)
Projects and Grants: IPF Grant 20140154, NSERC Discovery Grant, ARC CECRS CE140100020
Research Data: http://dx.doi.org/10.4225/28/57E4B1AAA90E1
Date Deposited: 05 Dec 2016 05:12
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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