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Freshening effect on the osmotic response of the Antarctic spiny plunderfish Harpagifer antarcticus

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dc.contributor.authorVargas-Chacoff, Luis
dc.contributor.authorDann, Francisco
dc.contributor.authorPaschke, Kurt
dc.contributor.authorOyarzun-Salazar, Ricardo
dc.contributor.authorNualart, Daniela
dc.contributor.authorMartinez, Danixa
dc.contributor.authorWilson, Jonathan M.
dc.contributor.authorGuerreiro, Pedro
dc.contributor.authorNavarro, Jorge M.
dc.date.accessioned2021-09-08T10:58:07Z
dc.date.available2021-09-08T10:58:07Z
dc.date.issued2021
dc.description.abstractGlobal warming is having a significant impact around the world, modifying environmental conditions in many areas, including in zones that have been thermally stable for thousands of years, such as Antarctica. Stenothermal sedentary intertidal fish species may suffer due to warming, notably if this causes water freshening from increased freshwater inputs. Acute decreases in salinity, from 33 down to 5, were used to assess osmotic responses to environmental salinity fluctuations in Antarctic spiny plunderfish Harpagifer antarcticus, in particular to evaluate if H. antarcticus is able to cope with freshening and to describe osmoregulatory responses at different levels (haematological variables, muscle water content, gene expression, NKA activity). H. antarcticus were acclimated to a range of salinities (33 as control, 20, 15, 10 and 5) for 1 week. At 5, plasma osmolality and calcium concentration were both at their lowest, while plasma cortisol and percentage muscle water content were at their highest. At the same salinity, gill and intestine Na+-K+-ATPase (NKA) activities were at their lowest and highest, respectively. In kidney, NKA activity was highest at intermediate salinities (15 and 10). The salinity-dependent NKA mRNA expression patterns differed depending on the tissue. Marked changes were also observed in the expression of genes coding membrane proteins associated with ion and water transport, such as NKCC2, CFTR and AQP8, and in the expression of mRNA for the regulatory hormone prolactin (PRL) and its receptor (PRLr). Our results demonstrate that freshening causes osmotic imbalances in H. antarcticus, apparently due to reduced capacity of both transport and regulatory mechanisms of key organs to maintain homeostasis. This has implications for fish species that have evolved in stable environmental conditions in the Antarctic, now threatened by climate change.
dc.description.sponsorshipChilean grants FONDAP-IDEAL [15150003]; FONDECYT REGULAR grantComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT FONDECYT [1160877]; VIDCA-UACH; INACH; FCT - Portuguese Foundation for Science and TechnologyPortuguese Foundation for Science and Technology [UIDB/04326/2020, PTDC/BIA-ANM/3484/2014]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1111/jfb.14676
dc.identifier.issn0022-1112
dc.identifier.urihttp://hdl.handle.net/10400.1/17032
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWILEY
dc.relationAlgarve Centre for Marine Sciences
dc.relationPhysiological and molecular plasticity to thermal and osmoregulatory challenges in Antarctic fishes
dc.subjectAntarctic fish
dc.subjectFreshening
dc.subjectOsmoregulation
dc.subjectSalinity
dc.subject.otherFisheries; Marine & Freshwater Biology
dc.titleFreshening effect on the osmotic response of the Antarctic spiny plunderfish Harpagifer antarcticus
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitlePhysiological and molecular plasticity to thermal and osmoregulatory challenges in Antarctic fishes
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FBIA-ANM%2F3484%2F2014/PT
oaire.citation.titleJournal of Fish Biology
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream3599-PPCDT
person.familyNameGuerreiro
person.givenNamePedro Miguel
person.identifierA-2539-2009
person.identifier.ciencia-id5C13-965D-3148
person.identifier.orcid0000-0001-5371-7919
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoveryd0a8a148-98e7-4899-8fb0-0b8afa91e4a4
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