Low global sensitivity of metabolic rate to temperature in calcified marine invertebrates

Watson, Sue-Ann, Morley, Simon A., Bates, Amanda E., Clark, Melody S., Day, Robert W., Lamare, Miles, Martin, Stephanie M., Southgate, Paul C., Tan, Koh Siang, Tyler, Paul A., and Peck, Lloyd S. (2014) Low global sensitivity of metabolic rate to temperature in calcified marine invertebrates. Oecologia, 174 (1). pp. 45-54.

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Abstract

Metabolic rate is a key component of energy budgets that scales with body size and varies with large-scale environmental geographical patterns. Here we conduct an analysis of standard metabolic rates (SMR) of marine ectotherms across a 70° latitudinal gradient in both hemispheres that spanned collection temperatures of 0-30 °C. To account for latitudinal differences in the size and skeletal composition between species, SMR was mass normalized to that of a standard-sized (223 mg) ash-free dry mass individual. SMR was measured for 17 species of calcified invertebrates (bivalves, gastropods, urchins and brachiopods), using a single consistent methodology, including 11 species whose SMR was described for the first time. SMR of 15 out of 17 species had a mass-scaling exponent between 2/3 and 1, with no greater support for a 3/4 rather than a 2/3 scaling exponent. After accounting for taxonomy and variability in parameter estimates among species using variance-weighted linear mixed effects modelling, temperature sensitivity of SMR had an activation energy ( Ea) of 0.16 for both Northern and Southern Hemisphere species which was lower than predicted under the metabolic theory of ecology ( Ea 0.2-1.2 eV). Northern Hemisphere species, however, had a higher SMR at each habitat temperature, but a lower mass-scaling exponent relative to SMR. Evolutionary trade-offs that may be driving differences in metabolic rate (such as metabolic cold adaptation of Northern Hemisphere species) will have important impacts on species abilities to respond to changing environments.

Item ID: 32083
Item Type: Article (Refereed Research - C1)
Additional Information:

This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s)and the source are credited.

ISSN: 1432-1939
Funders: British Antarctic Survey, Collaborative Gearing Scheme Grant
Date Deposited: 01 May 2014 04:42
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
06 BIOLOGICAL SCIENCES > 0606 Physiology > 060699 Physiology not elsewhere classified @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 90%
96 ENVIRONMENT > 9699 Other Environment > 969901 Antarctic and Sub-Antarctic Oceanography @ 10%
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