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Thermal plasticity with physiological trade-offs in the invasive cichlid australoheros facetus under warming scenarios in mediterranean-type rivers

2026-06-16Documento de conferência Acesso aberto
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datacite.subject.sdg06:Água Potável e Saneamento
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorSantos, Emanuel
dc.contributor.authorGregorio, Silvia
dc.contributor.authorCosta, Rita
dc.contributor.authorMolina, Juan M.
dc.contributor.authorGuerreiro, Pedro Miguel
dc.date.accessioned2026-07-09T09:19:39Z
dc.date.available2026-07-09T09:19:39Z
dc.date.issued2026-06-16
dc.description.abstractIntroduction: Climate warming and drought are intensifying thermal stress in Mediterranean freshwater systems, potentially favoring invasive fish with broad physiological tolerance. Extended environmental tolerance and increased aerobic scope are indicative of the potential to sustain, perform and disseminate in challenging conditions. Objective: We aimed to determine the thermal scope of the invasive Australoheros facetus inhabiting southern Portuguese drainages using an array of physiological proxies. Methodology: We evaluated the thermal biology of the species across a wide temperature gradient to test how warming affects metabolic performance, thermal tolerance, and biochemical status. Fish collected from Algarve watercourses were exposed to 5, 10, 15, 20, 25 and 35 °C (n = 15 per condition, 10–60 g) for at least a week, and intermittent respirometry was used to determine standard metabolic rate (SMR), maximum metabolic rate (MMR) and aerobic scope (AS). Group Q10 was derived from metabolic rates. Plasma and tissue biomarkers of energy metabolism and oxidative stress were analyzed. Critical thermal maximum (CTmax) was assessed in fish acclimated for a week at 10, 20 and 30 °C (n = 10) using a 1 °C/min thermal ramp. Results: Intermediate temperatures (15–25 °C) supported the best overall physiological performance, combining stronger aerobic capacity with higher antioxidant protection. In contrast, 30–35 °C imposed clear physiological costs: maintenance metabolism increased disproportionately, aerobic scope declined, and cellular protection weakened, indicating the onset of heat stress. Despite this, A. facetus showed marked thermal plasticity, with CTmax increasing significantly with acclimation temperature. Fish acclimated to 30 °C had higher CTmax than fish acclimated to 20 °C and 10 °C, although the thermal safety margin decreased progressively as the acclimation temperature rose. Liver antioxidant activity also peaked at intermediate temperatures and declined at the warmest treatments, reinforcing the mismatch between acute tolerance and sustained performance. Conclusions: These results show that A. facetus is highly heat tolerant but that tolerance comes with energetic and cellular trade-offs near upper thermal limits. Despite this limitation at extreme conditions, the combination of broad tolerance and functional performance under warm intermediate conditions may help to explain its invasion success and stand as a competitive advantage in increasingly hot low-flow Iberian freshwater ecosystems.eng
dc.description.sponsorshipUID/PRR/04326/2025; UID/PRR/04326/2025; EMBRC.PT ALG-01-0145-FEDER-022121
dc.identifier.doi10.3390/proceedings2026146033
dc.identifier.issn2504-3900
dc.identifier.urihttp://hdl.handle.net/10400.1/29241
dc.language.isoeng
dc.peerreviewedyes
dc.publisherMDPI
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofSIBIC 2026
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectInvasive fish
dc.subjectThermal plasticity
dc.subjectPhysiological performance
dc.subjectCompetitive advantage
dc.titleThermal plasticity with physiological trade-offs in the invasive cichlid australoheros facetus under warming scenarios in mediterranean-type riverseng
dc.typeconference object
dspace.entity.typePublication
oaire.awardNumberLA/P/0101/2020
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.conferencePlaceVila Real, Portugal
oaire.citation.issue1
oaire.citation.startPage33
oaire.citation.titleProceedings of The XI Iberian Congress of Ichthyology
oaire.citation.volume146
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameGregorio
person.familyNameCosta
person.familyNameGuerreiro
person.givenNameSilvia
person.givenNameRita
person.givenNamePedro Miguel
person.identifier1579837
person.identifierA-2539-2009
person.identifier.ciencia-idBF14-020B-4C39
person.identifier.ciencia-id8219-DFF3-929F
person.identifier.ciencia-id5C13-965D-3148
person.identifier.orcid0000-0002-6648-5122
person.identifier.orcid0000-0002-6975-7576
person.identifier.orcid0000-0001-5371-7919
person.identifier.ridG-1618-2018
person.identifier.ridO-9136-2018
person.identifier.scopus-author-id57097731700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublication9bc940d8-7dfb-4950-98f4-6853f398cb49
relation.isAuthorOfPublication943d1248-7839-42b3-89a9-b539b3209cd7
relation.isAuthorOfPublicationd0a8a148-98e7-4899-8fb0-0b8afa91e4a4
relation.isAuthorOfPublication.latestForDiscovery9bc940d8-7dfb-4950-98f4-6853f398cb49
relation.isProjectOfPublication794d4c77-c731-471e-bc96-5a41dcd3d872
relation.isProjectOfPublication.latestForDiscovery794d4c77-c731-471e-bc96-5a41dcd3d872

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