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Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming

Recent studies forecast that many ectothermic animals, especially aquatic stenotherms, may not be able to thrive or even survive predicted climate change. These projections, however, generally do not call much attention to the role of behavior, an essential thermoregulatory mechanism of many ectothe...

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Autores principales: Ismailov, Iskander I., Scharping, Jordan B., Andreeva, Iraida E., Friedlander, Michael J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612528/
https://www.ncbi.nlm.nih.gov/pubmed/34818342
http://dx.doi.org/10.1371/journal.pone.0252359
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author Ismailov, Iskander I.
Scharping, Jordan B.
Andreeva, Iraida E.
Friedlander, Michael J.
author_facet Ismailov, Iskander I.
Scharping, Jordan B.
Andreeva, Iraida E.
Friedlander, Michael J.
author_sort Ismailov, Iskander I.
collection PubMed
description Recent studies forecast that many ectothermic animals, especially aquatic stenotherms, may not be able to thrive or even survive predicted climate change. These projections, however, generally do not call much attention to the role of behavior, an essential thermoregulatory mechanism of many ectotherms. Here we characterize species-specific locomotor and respiratory responses to acute ambient warming in two highly stenothermic Antarctic Notothenioid fishes, one of which (Chaenocephalus aceratus) lacks hemoglobin and appears to be less tolerant to thermal stress as compared to the other (Notothenia coriiceps), which expresses hemoglobin. At the onset of ambient warming, both species perform distinct locomotor maneuvers that appear to include avoidance reactions. In response to unavoidable progressive hyperthermia, fishes demonstrate a range of species-specific maneuvers, all of which appear to provide some mitigation of the deleterious effects of obligatory thermoconformation and to compensate for increasing metabolic demand by enhancing the efficacy of branchial respiration. As temperature continues to rise, Chaenocephalus aceratus supplements these behaviors with intensive pectoral fin fanning which may facilitate cutaneous respiration through its scaleless integument, and Notothenia coriiceps manifests respiratory-locomotor coupling during repetitive startle-like maneuvers which may further augment gill ventilation. The latter behaviors, found only in Notothenia coriiceps, have highly stereotyped appearance resembling Fixed Action Pattern sequences. Altogether, this behavioral flexibility could contribute to the reduction of the detrimental effects of acute thermal stress within a limited thermal range. In an ecologically relevant setting, this may enable efficient thermoregulation of fishes by habitat selection, thus facilitating their resilience in persistent environmental change.
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spelling pubmed-86125282021-11-25 Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming Ismailov, Iskander I. Scharping, Jordan B. Andreeva, Iraida E. Friedlander, Michael J. PLoS One Research Article Recent studies forecast that many ectothermic animals, especially aquatic stenotherms, may not be able to thrive or even survive predicted climate change. These projections, however, generally do not call much attention to the role of behavior, an essential thermoregulatory mechanism of many ectotherms. Here we characterize species-specific locomotor and respiratory responses to acute ambient warming in two highly stenothermic Antarctic Notothenioid fishes, one of which (Chaenocephalus aceratus) lacks hemoglobin and appears to be less tolerant to thermal stress as compared to the other (Notothenia coriiceps), which expresses hemoglobin. At the onset of ambient warming, both species perform distinct locomotor maneuvers that appear to include avoidance reactions. In response to unavoidable progressive hyperthermia, fishes demonstrate a range of species-specific maneuvers, all of which appear to provide some mitigation of the deleterious effects of obligatory thermoconformation and to compensate for increasing metabolic demand by enhancing the efficacy of branchial respiration. As temperature continues to rise, Chaenocephalus aceratus supplements these behaviors with intensive pectoral fin fanning which may facilitate cutaneous respiration through its scaleless integument, and Notothenia coriiceps manifests respiratory-locomotor coupling during repetitive startle-like maneuvers which may further augment gill ventilation. The latter behaviors, found only in Notothenia coriiceps, have highly stereotyped appearance resembling Fixed Action Pattern sequences. Altogether, this behavioral flexibility could contribute to the reduction of the detrimental effects of acute thermal stress within a limited thermal range. In an ecologically relevant setting, this may enable efficient thermoregulation of fishes by habitat selection, thus facilitating their resilience in persistent environmental change. Public Library of Science 2021-11-24 /pmc/articles/PMC8612528/ /pubmed/34818342 http://dx.doi.org/10.1371/journal.pone.0252359 Text en © 2021 Ismailov et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Ismailov, Iskander I.
Scharping, Jordan B.
Andreeva, Iraida E.
Friedlander, Michael J.
Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title_full Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title_fullStr Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title_full_unstemmed Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title_short Antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
title_sort antarctic teleosts with and without hemoglobin behaviorally mitigate deleterious effects of acute environmental warming
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612528/
https://www.ncbi.nlm.nih.gov/pubmed/34818342
http://dx.doi.org/10.1371/journal.pone.0252359
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