Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1242/jeb.218602 http://hdl.handle.net/11449/200457 |
Resumo: | We investigated whether fatigue from sustained aerobic swimming provides a sub-lethal endpoint to define tolerance of acute warming in fishes, as an alternative to loss of equilibrium (LOE) during a critical thermal maximum (CTmax) protocol. Two species were studied, Nile tilapia (Oreochromis niloticus) and pacu (Piaractus mesopotamicus). Each fish underwent an incremental swim test to determine gait transition speed (UGT), where it first engaged the unsteady anaerobic swimming mode that preceded fatigue. After suitable recovery, each fish was exercised at 85% of their own UGT and warmed 1°C every 30 min, to identify the temperature at which they fatigued, denoted as CTswim. Fish were also submitted to a standard CTmax, warming at the same rate as CTswim, under static conditions until LOE. All individuals fatigued in CTswim, at a mean temperature approximately 2°C lower than their CTmax. Therefore, if exposed to acute warming in the wild, the ability to perform aerobic metabolic work would be constrained at temperatures significantly below those that directly threatened survival. The collapse in performance at CTswim was preceded by a gait transition qualitatively indistinguishable from that during the incremental swim test. This suggests that fatigue in CTswim was linked to an inability to meet the tissue oxygen demands of exercise plus warming. This is consistent with the oxygen and capacity limited thermal tolerance (OCLTT) hypothesis, regarding the mechanism underlying tolerance of warming in fishes. Overall, fatigue at CTswim provides an ecologically relevant sub-lethal threshold that is more sensitive to extreme events than LOE at CTmax |
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Repositório Institucional da UNESP |
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Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishesCTmaxOreochromis niloticusPiaractus mesopotamicusWe investigated whether fatigue from sustained aerobic swimming provides a sub-lethal endpoint to define tolerance of acute warming in fishes, as an alternative to loss of equilibrium (LOE) during a critical thermal maximum (CTmax) protocol. Two species were studied, Nile tilapia (Oreochromis niloticus) and pacu (Piaractus mesopotamicus). Each fish underwent an incremental swim test to determine gait transition speed (UGT), where it first engaged the unsteady anaerobic swimming mode that preceded fatigue. After suitable recovery, each fish was exercised at 85% of their own UGT and warmed 1°C every 30 min, to identify the temperature at which they fatigued, denoted as CTswim. Fish were also submitted to a standard CTmax, warming at the same rate as CTswim, under static conditions until LOE. All individuals fatigued in CTswim, at a mean temperature approximately 2°C lower than their CTmax. Therefore, if exposed to acute warming in the wild, the ability to perform aerobic metabolic work would be constrained at temperatures significantly below those that directly threatened survival. The collapse in performance at CTswim was preceded by a gait transition qualitatively indistinguishable from that during the incremental swim test. This suggests that fatigue in CTswim was linked to an inability to meet the tissue oxygen demands of exercise plus warming. This is consistent with the oxygen and capacity limited thermal tolerance (OCLTT) hypothesis, regarding the mechanism underlying tolerance of warming in fishes. Overall, fatigue at CTswim provides an ecologically relevant sub-lethal threshold that is more sensitive to extreme events than LOE at CTmaxDepartment of Physiological Sciences Federal University of Saõ CarlosJoint Graduate Program in Physiological Sciences Federal University of Saõ Carlos - UFSCar Saõ Paulo State University UNESP Campus AraraquaraMarine Science Institute University of Texas at AustinInstitute of Biodiversity Animal Health and Comparative Medicine College of Medical Veterinary and Life Sciences University of GlasgowSchool of Biosciences University of BirminghamMARBEC Université de Montpellier CNRS Ifremer IRDJoint Graduate Program in Physiological Sciences Federal University of Saõ Carlos - UFSCar Saõ Paulo State University UNESP Campus AraraquaraFederal University of Saõ CarlosUniversidade Estadual Paulista (Unesp)University of Texas at AustinUniversity of GlasgowUniversity of BirminghamIRDBlasco, Felipe R. [UNESP]Esbaugh, Andrew J.Killen, Shaun S.Rantin, Francisco TadeuTaylor, Edwin W.McKenzie, David J.2020-12-12T02:07:07Z2020-12-12T02:07:07Z2020-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1242/jeb.218602Journal of Experimental Biology, v. 223, n. 9, 2020.1477-91450022-0949http://hdl.handle.net/11449/20045710.1242/jeb.2186022-s2.0-85085135467Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Experimental Biologyinfo:eu-repo/semantics/openAccess2021-10-23T12:40:04Zoai:repositorio.unesp.br:11449/200457Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T12:40:04Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
title |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
spellingShingle |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes Blasco, Felipe R. [UNESP] CTmax Oreochromis niloticus Piaractus mesopotamicus |
title_short |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
title_full |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
title_fullStr |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
title_full_unstemmed |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
title_sort |
Using aerobic exercise to evaluate sub-lethal tolerance of acute warming in fishes |
author |
Blasco, Felipe R. [UNESP] |
author_facet |
Blasco, Felipe R. [UNESP] Esbaugh, Andrew J. Killen, Shaun S. Rantin, Francisco Tadeu Taylor, Edwin W. McKenzie, David J. |
author_role |
author |
author2 |
Esbaugh, Andrew J. Killen, Shaun S. Rantin, Francisco Tadeu Taylor, Edwin W. McKenzie, David J. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Federal University of Saõ Carlos Universidade Estadual Paulista (Unesp) University of Texas at Austin University of Glasgow University of Birmingham IRD |
dc.contributor.author.fl_str_mv |
Blasco, Felipe R. [UNESP] Esbaugh, Andrew J. Killen, Shaun S. Rantin, Francisco Tadeu Taylor, Edwin W. McKenzie, David J. |
dc.subject.por.fl_str_mv |
CTmax Oreochromis niloticus Piaractus mesopotamicus |
topic |
CTmax Oreochromis niloticus Piaractus mesopotamicus |
description |
We investigated whether fatigue from sustained aerobic swimming provides a sub-lethal endpoint to define tolerance of acute warming in fishes, as an alternative to loss of equilibrium (LOE) during a critical thermal maximum (CTmax) protocol. Two species were studied, Nile tilapia (Oreochromis niloticus) and pacu (Piaractus mesopotamicus). Each fish underwent an incremental swim test to determine gait transition speed (UGT), where it first engaged the unsteady anaerobic swimming mode that preceded fatigue. After suitable recovery, each fish was exercised at 85% of their own UGT and warmed 1°C every 30 min, to identify the temperature at which they fatigued, denoted as CTswim. Fish were also submitted to a standard CTmax, warming at the same rate as CTswim, under static conditions until LOE. All individuals fatigued in CTswim, at a mean temperature approximately 2°C lower than their CTmax. Therefore, if exposed to acute warming in the wild, the ability to perform aerobic metabolic work would be constrained at temperatures significantly below those that directly threatened survival. The collapse in performance at CTswim was preceded by a gait transition qualitatively indistinguishable from that during the incremental swim test. This suggests that fatigue in CTswim was linked to an inability to meet the tissue oxygen demands of exercise plus warming. This is consistent with the oxygen and capacity limited thermal tolerance (OCLTT) hypothesis, regarding the mechanism underlying tolerance of warming in fishes. Overall, fatigue at CTswim provides an ecologically relevant sub-lethal threshold that is more sensitive to extreme events than LOE at CTmax |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T02:07:07Z 2020-12-12T02:07:07Z 2020-05-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1242/jeb.218602 Journal of Experimental Biology, v. 223, n. 9, 2020. 1477-9145 0022-0949 http://hdl.handle.net/11449/200457 10.1242/jeb.218602 2-s2.0-85085135467 |
url |
http://dx.doi.org/10.1242/jeb.218602 http://hdl.handle.net/11449/200457 |
identifier_str_mv |
Journal of Experimental Biology, v. 223, n. 9, 2020. 1477-9145 0022-0949 10.1242/jeb.218602 2-s2.0-85085135467 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Experimental Biology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789374970068992 |