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Acute resilience, chronic costs: metabolic responses to warming and hypoxia in the sedentary lusitanian toadfish, halobatrachus didactylus

2026-06-16Documento de conferência Acesso aberto
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datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorMolina, Juan M.
dc.contributor.authorKunzmann, Andreas
dc.contributor.authorCosta, Rita
dc.contributor.authorModesto, Teresa
dc.contributor.authorCarvalho Alves, Alexandra
dc.contributor.authorGuerreiro, Pedro Miguel
dc.date.accessioned2026-07-06T13:07:26Z
dc.date.available2026-07-06T13:07:26Z
dc.date.issued2026-06-16
dc.description.abstractCoastal fishes can adapt to water warming and hypoxia; however, acute tolerance does not necessarily predict longer-term performance and survival. This may be especially important in sedentary, site-faithful species with limited escape to escape increasingly unfavorable habitats. We assessed the climate-related stress responses of the Lusitanian toadfish, Halobatrachus didactylus, a benthic estuarine fish from the Northeast Atlantic, to water warming and hypoxia. Objectives: We aimed to determine the aerobic energy budget, thermal limits (CTmax), and critical oxygen tension (Pcrit), as well as blood indicators of metabolism, altered physiology and systemic stress, as proxies for whole-organism homeostatic state, thereby informing future ecophysiological assessments and bioindicator development in a context of environmental change. Methodology: We determined standard, routine, and maximum metabolic rates; aerobic scope; and critical thermal maximum (CTmax) and critical oxygen (Pcrit) thresholds on a set of 134 individuals ranging from 12 to 160 g in weight. On a different set of individuals (n = 48; 76.3 ± 2.6 g; 16.1 ± 0.18 cm), we simulated 30 days of seasonal scenarios combining low and high temperature with normoxia or hypoxia, followed by integrated metabolic, hematological, biochemical, and multivariate analyses. Results: Acute trials showed high short-term resilience: H. didactylus had an exceptionally low standard metabolic rate and routine metabolic rate, high CTmax (34.82 ± 0.66 °C), and strong hypoxia tolerance (Pcrit 0.59–1.97 mg O2 L−1), although smaller individuals were more sensitive. After 30 days, however, warming more than doubled standard and routine metabolic rates, while warm hypoxia reduced metabolic output relative to warm normoxia, consistent with metabolic depression under compounded stressors. This treatment also showed shifts in glucose, liver mass, red blood cell count, and hematocrit, identifying warm, oxygen-poor water as the most physiologically costly scenario for this species. Conclusions: Together, these results show that high acute tolerance does not guarantee resilience to climate change. In sedentary fishes, survival may depend less on surviving extremes than on maintaining energetic balance, oxygen transport capacity, and physiological homeostasis in increasingly warm, oxygen-poor coastal habitats.eng
dc.identifier.doi10.3390/proceedings2026146029
dc.identifier.urihttp://hdl.handle.net/10400.1/29218
dc.language.isoeng
dc.peerreviewedyes
dc.publisherMDPI
dc.relationAlgarve Centre for Marine Sciences
dc.relation.ispartofSIBIC 2026
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectEnvironmental tolerance
dc.subjectMetabolic resilience
dc.subjectClimate stress
dc.subjectAerobic scope
dc.titleAcute resilience, chronic costs: metabolic responses to warming and hypoxia in the sedentary lusitanian toadfish, halobatrachus didactyluseng
dc.typeconference object
dspace.entity.typePublication
oaire.awardNumberUIDB/04326/2020
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.citation.conferenceDate2026
oaire.citation.issue1
oaire.citation.startPage29
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.familyNameCosta
person.familyNameModesto
person.familyNameCarvalho Alves
person.familyNameGuerreiro
person.givenNameRita
person.givenNameTeresa
person.givenNameAlexandra
person.givenNamePedro Miguel
person.identifierA-2539-2009
person.identifier.ciencia-id8219-DFF3-929F
person.identifier.ciencia-idBD1C-7610-B888
person.identifier.ciencia-id8D19-0844-ACCF
person.identifier.ciencia-id5C13-965D-3148
person.identifier.orcid0000-0002-6975-7576
person.identifier.orcid0000-0002-2691-4906
person.identifier.orcid0000-0003-1153-596X
person.identifier.orcid0000-0001-5371-7919
person.identifier.ridO-9136-2018
person.identifier.scopus-author-id57097731700
person.identifier.scopus-author-id6603372075
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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