Is there a trade-off between peak performance and performance breadth across temperatures for aerobic scope in teleost fishes?

Julie J. H. Nati, Jan Lindström, Lewis G. Halsey, Shaun S. Killen

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The physiology and behaviour of ectotherms are strongly influenced by environmental temperature. A general hypothesis is that for performance traits, such as those related to growth, metabolism, or locomotion, species face a trade-off between being a thermal specialist or a thermal generalist, implying a negative correlation between peak performance and performance breadth across a range of temperatures. Focussing on teleost fishes, we performed a phylogenetically-informed comparative analysis of the relationship between performance peak and breadth for aerobic scope (AS), which represents whole-animal capacity available to carry out simultaneous oxygen-demanding processes (e.g. growth, locomotion, reproduction) above maintenance. Literature data for 28 species indicate that peak aerobic capacity is not linked to thermal performance breadth and that other physiological factors affecting thermal tolerance may prevent such a trade-off from emerging. The results therefore suggest that functional links between peak and thermal breadth for AS may not constrain evolutionary responses to environmental changes such as climate warming.

© 2016 The Authors. The attached document (under embargo until September 2017) is an author produced version of a paper published in/accepted for publication in Biology Letters uploaded in accordance with the publisher’s self- archiving policy. The final published version (version of record) is available online via The Royal Society at Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it.
Original languageEnglish
Issue number9
Publication statusPublished - 27 Sep 2016

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