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First measurements of field metabolic rate in wild juvenile fishes show strong thermal sensitivity but variations between sympatric ecotypes

First measurements of field metabolic rate in wild juvenile fishes show strong thermal sensitivity but variations between sympatric ecotypes
First measurements of field metabolic rate in wild juvenile fishes show strong thermal sensitivity but variations between sympatric ecotypes
The relationship between physiology and temperature has a large influence on population‐level responses to climate change. In natural settings, direct thermal effects on metabolism may be exaggerated or offset by behavioural responses influencing individual energy balance. Drawing on a newly developed proxy, we provide the first estimates of the thermal performance curve of field metabolism in a wild fish. We investigate the thermal sensitivity of field metabolic rate in two sympatric, genetically distinct ecotypes of Atlantic cod from the Skagerrak coast of southern Norway. The combined ecotype median of field metabolic rate increased with increasing temperature until around 16°C, coincident with the thermal optimum for growth for juvenile Atlantic cod. Individual cod experienced temperatures in excess of the thermal optimum for field metabolic rate, indicating some degree of thermal limitation of field metabolism in a complex natural environment with the potential for thermal refugia. The two cod ecotypes showed different thermal performance curves for field metabolic rate, revealing that genetic components to temperature sensitivity persist beyond acclimation effects. The cold‐adapted fjord ecotype maintained higher field metabolic rates at cooler temperatures than the warm‐adapted North Sea ecotype, which showed clear preference for warmer waters around the thermal optimum. Field metabolic rates of the two ecotypes were strongly influenced by year and location of sampling, implying more complex behavioural responses to environmental conditions. We emphasise that the energy uses reflecting physiological conditions in the field should be considered in the evaluation of the effect of climatic variables on fish population dynamics and demonstrate that otolith isotopes provide an analytical framework to answer this question.
metabolic range, otolith, phenotypic performance, stable carbon isotope, stable oxygen isotope
0030-1299
287-299
Chung, Ming‐Tsung
7edd5a04-26ab-4124-aff9-42f6af77a887
Jørgensen, Kris‐Emil Mose
186a2682-9590-4e5c-8de2-390d7c80e3e5
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Knutsen, Halvor
03bfb189-5b4a-4f6c-aa9f-c0f855544299
Jorde, Per Erik
6686f022-5aa6-4386-85dd-4b18fb2f82f9
Grønkjær, Peter
994a0ef7-69ec-45bd-9ce4-d655842e0d1f
Chung, Ming‐Tsung
7edd5a04-26ab-4124-aff9-42f6af77a887
Jørgensen, Kris‐Emil Mose
186a2682-9590-4e5c-8de2-390d7c80e3e5
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Knutsen, Halvor
03bfb189-5b4a-4f6c-aa9f-c0f855544299
Jorde, Per Erik
6686f022-5aa6-4386-85dd-4b18fb2f82f9
Grønkjær, Peter
994a0ef7-69ec-45bd-9ce4-d655842e0d1f

Chung, Ming‐Tsung, Jørgensen, Kris‐Emil Mose, Trueman, Clive N., Knutsen, Halvor, Jorde, Per Erik and Grønkjær, Peter (2021) First measurements of field metabolic rate in wild juvenile fishes show strong thermal sensitivity but variations between sympatric ecotypes. Oikos, 130 (2), 287-299. (doi:10.1111/oik.07647).

Record type: Article

Abstract

The relationship between physiology and temperature has a large influence on population‐level responses to climate change. In natural settings, direct thermal effects on metabolism may be exaggerated or offset by behavioural responses influencing individual energy balance. Drawing on a newly developed proxy, we provide the first estimates of the thermal performance curve of field metabolism in a wild fish. We investigate the thermal sensitivity of field metabolic rate in two sympatric, genetically distinct ecotypes of Atlantic cod from the Skagerrak coast of southern Norway. The combined ecotype median of field metabolic rate increased with increasing temperature until around 16°C, coincident with the thermal optimum for growth for juvenile Atlantic cod. Individual cod experienced temperatures in excess of the thermal optimum for field metabolic rate, indicating some degree of thermal limitation of field metabolism in a complex natural environment with the potential for thermal refugia. The two cod ecotypes showed different thermal performance curves for field metabolic rate, revealing that genetic components to temperature sensitivity persist beyond acclimation effects. The cold‐adapted fjord ecotype maintained higher field metabolic rates at cooler temperatures than the warm‐adapted North Sea ecotype, which showed clear preference for warmer waters around the thermal optimum. Field metabolic rates of the two ecotypes were strongly influenced by year and location of sampling, implying more complex behavioural responses to environmental conditions. We emphasise that the energy uses reflecting physiological conditions in the field should be considered in the evaluation of the effect of climatic variables on fish population dynamics and demonstrate that otolith isotopes provide an analytical framework to answer this question.

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More information

Accepted/In Press date: 6 November 2020
e-pub ahead of print date: 18 November 2020
Published date: February 2021
Keywords: metabolic range, otolith, phenotypic performance, stable carbon isotope, stable oxygen isotope

Identifiers

Local EPrints ID: 448526
URI: http://eprints.soton.ac.uk/id/eprint/448526
ISSN: 0030-1299
PURE UUID: ba15e705-cbd6-4cee-bff6-ade16d279edf

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Date deposited: 23 Apr 2021 16:36
Last modified: 25 Nov 2021 18:43

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Contributors

Author: Ming‐Tsung Chung
Author: Kris‐Emil Mose Jørgensen
Author: Halvor Knutsen
Author: Per Erik Jorde
Author: Peter Grønkjær

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