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Ecophysiological response of native and invasive Spartina species to extreme temperature events in Mediterranean marshes

2016Journal article Restricted access
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dc.contributor.authorDuarte, Bernardo
dc.contributor.authorMarques, J. C.
dc.contributor.authorCaçador, Isabel
dc.date.accessioned2019-06-25T09:44:27Z
dc.date.available2019-06-25T09:44:27Z
dc.date.issued2016
dc.description.abstractThe recent IPCC WG2 5th Assessment Report (IPCC 2014), notes an increase in the frequency and duration of extreme climatic events, especially for the Mediterranean region. Together with climate change, the invasion of natural communities by non-indigenous species (NIS) constitutes a serious threat to biodiversity. One of these NIS is the American Spartina patens, now present in Western European marshes. The present study aims to understand the biochemical and photochemical responses of S. patens compared with S. maritima under extreme temperature events. Under normal and extreme heat conditions, S. patens had a higher photosynthetic efficiency (α), compared with cold wave events, where the native S. maritima was far more efficient. This reduced photosynthetic efficiency was mostly due to a decrease in the connectivity between photosystem II (PSII) antennae. This was accompanied by severe damage to the oxygen-evolving complex of PSII. On the other hand, S. patens oxygen evolving complexes (OECs) seem to be temperature insensitive. The light absorption capacity was maintained due to a higher net rate of reaction centre (RC) closure as a counteractive measure of the reduced number of RC, especially in S. maritima. The loss of connectivity between PSII antennae and damage in OECs under heat stress leads to a severe reduction in the maximum yield for photochemistry enhanced by the low probability of each absorbed quanta to produce electronic work. However, while S. maritima presents high energy losses under heat stress, S. patens developed efficient quenching mechanisms under thermal stress, through auroxanthin. In S. patens, cold wave-treated individuals also displayed a very active line of enzymatic defences for reactive oxygen species scavenging. In fact, only cold treated individuals of this species presented higher activities of anti-oxidant enzymes, revealing some degree of adaptation to this new environment. In contrast, in S. maritima the exposure to extreme heat periods led, in most cases, to a decrease in the enzymatic defences, leaving the cell prone to oxidative damage. In summary, S. patens appears to have a higher fitness for the incoming climatic scenarios, being more tolerant to heat stress, while S. maritima will have its photobiological fitness decreased. This will impose a shift in the salt marsh biodiversity, favouring the non-indigenous S. patens expansion.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1007/s10530-015-0958-4pt_PT
dc.identifier.issn1387-3547
dc.identifier.urihttp://hdl.handle.net/10451/38788
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectNon-indigenous speciespt_PT
dc.subjectPhoto-system thermo-stabilitypt_PT
dc.subjectOxidative stresspt_PT
dc.subjectEcophysiological fitnesspt_PT
dc.titleEcophysiological response of native and invasive Spartina species to extreme temperature events in Mediterranean marshespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2205pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage2189pt_PT
oaire.citation.titleBiological Invasionspt_PT
oaire.citation.volume18pt_PT
person.familyNameDuarte
person.familyNameMARQUES
person.familyNameCaçador
person.givenNameBernardo
person.givenNameJOÃO CARLOS
person.givenNameIsabel
person.identifier89449
person.identifier134821
person.identifier.ciencia-id731E-093F-D4C8
person.identifier.ciencia-id9F11-7A1E-BEEC
person.identifier.ciencia-id631C-9FFE-CA81
person.identifier.orcid0000-0003-1914-7435
person.identifier.orcid0000-0001-8865-8189
person.identifier.orcid0000-0002-4475-6091
person.identifier.ridH-2001-2011
person.identifier.ridL-9478-2014
person.identifier.ridC-2618-2012
person.identifier.scopus-author-id20734149900
person.identifier.scopus-author-id7203032961
person.identifier.scopus-author-id6602533871
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationa72f0f40-c224-49ad-ba21-ebb5f9aab09c
relation.isAuthorOfPublication97130a55-0383-4d1b-8d73-4a5ca889e529
relation.isAuthorOfPublication02ecb390-88b9-4e2f-8690-eba66c3b5311
relation.isAuthorOfPublication.latestForDiscoverya72f0f40-c224-49ad-ba21-ebb5f9aab09c

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