Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments

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datacite.alternateIdentifier.citationPlants-Basel, 11 (19), 2022
datacite.alternateIdentifier.doi10.3390/plants11192463
datacite.alternateIdentifier.issn2223-7747
datacite.creatorMarin, Catalina
datacite.creatorBartak, Milos
datacite.creatorPalfner, Gotz
datacite.creatorVergara-Barros, Pablo
datacite.creatorFernandoy, Francisco
datacite.creatorHajek, Josef
datacite.creatorCasanova-Katny, Angelica
datacite.date2022
datacite.rightsAcceso abierto
datacite.subjectchlorophyll fluorescence
datacite.subjectnitrogen isotope
datacite.subjectclimate change
datacite.subjectthermal shock
datacite.titleAntarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments
dc.contributor.authorCASANOVA KATNY, MARIA ANGELICA
dc.description.abstractClimate warming in the Antarctic tundra will affect locally dominant cryptogams. Being adapted to low temperatures and freezing, little is known about the response of the polar lichens' primary photochemistry to warming and desiccation. Since 2008, we have monitored the ecophysiological responses of lichens to the future warming scenario during a long-term warming experiment through open top chambers (OTCs) on Fildes Peninsula. We studied the primary photochemical response (potential Fv/Fm and effective efficiency of photosystem II YPSII) of different lichen taxa and morphotypes under desiccation kinetics and heat shock experiments. As lichens grow slowly, to observe changes during warming we methodologically focused on carbon and nitrogen content as well as on the stable isotope ratios. Endemic Himantormia lugubris showed the strongest effect of long-term warming on primary photochemistry, where PSII activity occurred at a lower %RWC inside the OTCs, in addition to higher Fv/Fm values at 30 degrees C in the heat shock kinetic treatment. In contrast, Usnea aurantiaco-atra did not show any effect of long-term warming but was active at a thallus RWC lower than 10%. Both Cladonia species were most affected by water stress, with Cladonia aff. gracilis showing no significant differences in primary photochemical responses between the warming and the control but a high sensibility to water deficiency, where, at 60% thallus RWC, the photochemical parameters began to decrease. We detected species-specific responses not only to long-term warming, but also to desiccation. On the other hand, the carbon content did not vary significantly among the species or because of the passive warming treatment. Similarly, the nitrogen content showed non-significant variation; however, the C/N ratio was affected, with the strongest C/N decrease in Cladonia borealis. Our results suggest that Antarctic lichens can tolerate warming and high temperature better than desiccation and that climate change may affect these species if it is associated with a decrease in water availability.
dc.description.ia_keywordwarming, lichens, desiccation, long, term, species, primary
dc.formatPDF
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/4828
dc.language.isoen
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
dc.relationinstname: ANID
dc.relationreponame: Repositorio Digital RI2.0
dc.rights.driverinfo:eu-repo/semantics/openAccess
dc.sourcePlants-Basel
dc.subject.ia_odsODS 13: Acción por el clima
dc.subject.ia_oecd1nCiencias Naturales
dc.subject.ia_oecd2nCiencias Biológicas
dc.subject.ia_oecd3nCiencias del Medio Ambiente
dc.type.driverinfo:eu-repo/semantics/article
dc.type.driverhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.type.openaireinfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
oaire.citationEdition2022
oaire.citationIssue19
oaire.citationTitlePlants-Basel
oaire.citationVolume11
oaire.fundingReferenceINACH RT 2716
oaire.fundingReferenceANID FONDECYT 1181745 (Regular)
oaire.fundingReferenceECOPOLARIS CZ.02.1.01/0.0/0.0/16_013/0001708
oaire.fundingReferenceCzech Antarctic Research Program
oaire.fundingReferenceVAN 2022
oaire.licenseConditionObra bajo licencia Creative Commons Atribución 4.0 Internacional
oaire.licenseCondition.urihttps://creativecommons.org/licenses/by/4.0/
oaire.resourceTypeArtículo
oaire.resourceType.enArticle
relation.isAuthorOfPublicationa9399b7c-ca2e-4330-b761-690bd7ef26d8
relation.isAuthorOfPublication.latestForDiscoverya9399b7c-ca2e-4330-b761-690bd7ef26d8
uct.catalogadorjvu
uct.comunidadRecursos Naturalesen_US
uct.departamentoDepartamento de Ciencias Ambientales
uct.facultadFacultad de Recursos Naturales
uct.indizacionScience Citation Index Expanded - SCIE
uct.indizacionSCOPUS
uct.indizacionWOS
uct.indizacionDOAJ
uct.indizacionPubMed
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