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Field metabolic rates of teleost fishes are recorded in otolith carbonate.


ABSTRACT: Field metabolic rate (FMR) is key to understanding individual and population-level responses to environmental changes, but is challenging to measure in field conditions, particularly in aquatic environments. Here we show that FMR can be estimated directly from the isotopic composition of carbon in fish otoliths (?13Coto). We describe the relationship between ?13Coto values and oxygen consumption rate, and report results from laboratory experiments relating individual-level measurements of oxygen consumption rates to ?13Coto values in Atlantic cod (Gadus morhua). We apply our new ?13Coto metabolic proxy to existing ?13Coto data from wild cod and four deepwater fish species to test the validity of inferred FMR estimates. The ?13Coto metabolic proxy offers a new approach to study physiological ecology in free-ranging wild fishes. Otolith-based proxies for FMR are particularly promising as they allow retrospective assessment of time-integrated, individual-level FMR throughout an individual fish's life history.

SUBMITTER: Chung MT 

PROVIDER: S-EPMC6338665 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Field metabolic rates of teleost fishes are recorded in otolith carbonate.

Chung Ming-Tsung MT   Trueman Clive N CN   Godiksen Jane Aanestad JA   Holmstrup Mathias Engell ME   Grønkjær Peter P  

Communications biology 20190118


Field metabolic rate (FMR) is key to understanding individual and population-level responses to environmental changes, but is challenging to measure in field conditions, particularly in aquatic environments. Here we show that FMR can be estimated directly from the isotopic composition of carbon in fish otoliths (δ<sup>13</sup>C<sub>oto</sub>). We describe the relationship between δ<sup>13</sup>C<sub>oto</sub> values and oxygen consumption rate, and report results from laboratory experiments rela  ...[more]

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