Congeneric Amphipods Show Differing Abilities to Maintain Metabolic Rates with Latitude

Rastrick, S.P.S. and Whiteley, N.M. (2011) Congeneric Amphipods Show Differing Abilities to Maintain Metabolic Rates with Latitude. Physiology and Biochemical Zoology, 84 (2). pp. 154-165. DOI: 10.1086/658857

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Metabolic variability across latitudinal populations of gammarid amphipods was examined in the summer by determining whole-animal rates of oxygen uptake () in four species with overlapping distribution patterns in the northeast Atlantic and Arctic oceans. Comparisons were made between an arctic/boreal species, Gammarus setosus, a subarctic/boreal species, Gammarus oceanicus, a boreal/temperate species, Gammarus duebeni duebeni, and a temperate species, Gammarus locusta. Measurements included acclimatized in all four species and after acclimation to 10°C in two populations of G. oceanicus and G. locusta. In G. oceanicus, acclimatized declined with latitude (13° to 5°C) so that metabolic rates were lower in subarctic (79°N) relative to temperate (58°N) populations and similar to the values in G. setosus at 79°N. Consequently, there was no evidence for metabolic rate compensation in the colder-water, high-latitude populations in the summer. Further examination of the specific effects of temperature revealed similarities in between populations of G. oceanicus acclimated at 10°C and similarities in thermal sensitivity (Q10) and activation energies (Ea) on exposure to acute temperature change. In sharp contrast, there was no variation in summer acclimatized with latitude in either G. d. duebeni between 48° and 70°N or G. locusta between 38° and 53°N. Instead, the two species maintained relatively high metabolic rates across latitudes, which were associated in G. locusta with differences in and with Q10 and Ea values in amphipods acclimated at 10°C. The ability to compensate metabolic rate with latitude in the summer suggests greater metabolic flexibility, which predicts a greater capacity for survival during climate change of the temperate/boreal over the subarctic and arctic gammarid species.

Item Type: Article
Subjects: Research Publications
Departments: College of Natural Sciences > School of Biological Sciences
Date Deposited: 09 Dec 2014 17:06
Last Modified: 23 Sep 2015 03:23
ISSN: 1522-2152
URI: http://e.bangor.ac.uk/id/eprint/2054
Identification Number: DOI: 10.1086/658857
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