Mechanisms for climate-induced mortality of fish populations in whole-lake experiments

Biro, Peter A., Post, John R. and Booth, David J. 2007, Mechanisms for climate-induced mortality of fish populations in whole-lake experiments, National academy of sciences. Proceedings, vol. 104, no. 23, pp. 9715-9719, doi: 10.1073/pnas.0701638104.

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Title Mechanisms for climate-induced mortality of fish populations in whole-lake experiments
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A.
Post, John R.
Booth, David J.
Journal name National academy of sciences. Proceedings
Volume number 104
Issue number 23
Start page 9715
End page 9719
Total pages 5
Publisher National Academy of Sciences
Place of publication Washington, D. C.
Publication date 2007-06-05
ISSN 0027-8424
Keyword(s) behavior
trade off
Summary The effects of climate change on plant and animal populations are widespread and documented for many species in many areas of the world. However, projections of climate impacts will require a better mechanistic understanding of ecological and behavioral responses to climate change and climate variation. For vertebrate animals, there is an absence of whole-system manipulative experiments that express natural variation in predator and prey behaviors. Here we investigate the effect of elevated water temperature on the physiology, behavior, growth, and survival of fish populations in a multiple whole-lake experiment, by using 17 lake-years of data collected over 2 years with differing average temperatures. We found that elevated temperatures in excess of the optimum reduced the scope for growth through reduced maximum consumption and increased metabolism in young rainbow trout, Oncorhynchus mykiss. Increased metabolism at high temperatures resulted in increased feeding activity (consumption) by individuals to compensate and maintain growth rates similar to that observed at cooler (optimum) temperatures. However, greater feeding activity rates resulted in greater vulnerability to predators that reduced survival to only half that of the cooler year. Our work therefore identifies temperature-dependent physiology and compensatory feeding behavior as proximate mechanisms for substantial climate-induced mortality in fish populations at the scale of entire populations and waterbodies.
Language eng
DOI 10.1073/pnas.0701638104
Field of Research 060201 Behavioural Ecology
060801 Animal Behaviour
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, by The National Academy of Sciences of the USA
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