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- Title
Low global sensitivity of metabolic rate to temperature in calcified marine invertebrates.
- Authors
Watson, Sue-Ann; Morley, Simon; Bates, Amanda; Clark, Melody; Day, Robert; Lamare, Miles; Martin, Stephanie; Southgate, Paul; Tan, Koh; Tyler, Paul; Peck, Lloyd
- 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.
- Subjects
SOUTHERN Hemisphere; MARINE invertebrates; CALCIFICATION; ACTIVATION energy; CLIMATE change; BIOENERGETICS
- Publication
Oecologia, 2014, Vol 174, Issue 1, p45
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-013-2767-8