Diel vertical migration of a Southern Ocean euphausiid, Euphausia triacantha, and its metabolic response to consequent short-term temperature changes

Liszka, Cecilia M., Robinson, Carol ORCID: https://orcid.org/0000-0003-3033-4565, Manno, Clara, Stowasser, Gabriele and Tarling, Geraint A. (2021) Diel vertical migration of a Southern Ocean euphausiid, Euphausia triacantha, and its metabolic response to consequent short-term temperature changes. Marine Ecology Progress Series, 660. pp. 37-52. ISSN 0171-8630

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Diel vertical migration is a widespread behaviour amongst zooplankton, yet its effect on the rate at which individuals respire remains poorly understood. To address this, we investigated the effect of short-term temperature change on the respiration rate of Euphausia triacantha, a common component of the Southern Ocean zooplankton and a prominent vertical migrator. We found respiration to vary in response to size, with a value of 0.84 for the scaling coefficient, b. When scaled to b, respiration varied strongly in response to transitory temperature change, ranging from 0.37 to 1.65 μl O 2 mg dry weight (DW) −b h −1 between 0.17 and 4.74°C, resulting in a Q 10 of 3.6. This Q 10 is higher than found by other studies examining the short-term respiration response of euphausiids, including those taking a multi-species perspective. This indicates that E. triacantha shows little compensation during short-term exposure to temperatures normally encountered during migration. Furthermore, it shows a distinct metabolic cost to diel vertical migration (DVM) when substantive changes in temperature are encountered over the course of the transit. This temporal variability in respiration rate has important implications for how community respiration is estimated, and for our understanding of DVM behaviour. Our results also have particular relevance to estimating the flux and sequestration of respiratory products, such as dissolved carbon dioxide, to and within the ocean interior.

Item Type: Article
Additional Information: Acknowledgements. We acknowledge the master, crew and scientists aboard the RRS ‘James Clark Ross’ during cruises JR304 and JR15002 when the experiments took place, and cruises JR177 and JR200 as part of the DISCOVERY 2010 programme. In particular, we thank Peter Ward for his assistance with zooplankton enumeration. Funding information: This work was funded by a NERC studentship granted through the EnvEast Doctoral Training Partnership (Grant No. NE/L0025821/1) at the University of East Anglia. Fieldwork was supported by the British Antarctic Survey Ecosystems Programme and the Western Core Box and SCOOBIES Projects on board the RRS ‘James Clark Ross’.
Uncontrolled Keywords: dvm,diel vertical migration,elemental composition,euphausia triacantha,q,respiration,scotia sea,southern ocean,temperature coefficient,ecology, evolution, behavior and systematics,aquatic science,ecology ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Faculty of Science > Research Groups > Environmental Biology
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas
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Depositing User: LivePure Connector
Date Deposited: 12 Apr 2021 23:49
Last Modified: 20 Mar 2023 09:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/79683
DOI: 10.3354/meps13618


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