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Seagrass photo-physiological responses in natural high-CO2 environment

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dc.contributor.authorCosta, Monya
dc.contributor.authorOlivé, Irene
dc.contributor.authorBarrote, Isabel
dc.contributor.authorProcaccini, G.
dc.contributor.authorMazzuca, S.
dc.contributor.authorVizzini, Salvatrice
dc.contributor.authorSantos, Rui
dc.date.accessioned2014-01-10T11:16:43Z
dc.date.available2014-01-10T11:16:43Z
dc.date.issued2013
dc.description.abstractThe atmospheric concentration of CO2 has been steeply increasing over the last 200 years, with an associated increase of total dissolved inorganic carbon (Ci) and a decrease of the oceans’ pH. Seagrasses are among the most productive marine ecosystems, but yet little is known on the effects of high-CO2/low pH on their photosynthetic physiology and the ecological consequences. Marine CO2 seepage areas have been used as natural laboratories to investigate the performance of marine organisms under long-term exposure to high-CO2 levels that mimic the future ocean. In this work we conducted a series of experiments comparing the photophysiology of the seagrasses Posidonia oceanica and Cymodocea nodosa, growing in the vicinity of submarine CO2 vents around the islands of Vulcano and Panarea (Aeolian Archipelago, Southern Tyrrhenian Sea, Italy). Plants growing close to CO2-seepage sites were compared with plants from control sites. Automated chlorophyll fluorometers were deployed for 24-hour periods to examine the changes in photosynthetic efficiency and energy quenching mechanisms. Samples were collected at predawn and noon and analyzed for pigment composition, antioxidant capacity, and soluble carbohydrates. Differences in gene and protein expression were evaluated as a function of Ci levels. Stable carbon isotopes (δ13C) were also analysed to investigate the contribution of volcanic CO2 to seagrass productivity. Both P. oceanica and C. nodosa plants growing in CO2-seepage sites showed lower allocation of PSII-absorbed energy to photochemistry (φII), while presenting higher proportions of energy dissipation by non-photochemical pathways (down-regulation, φNPQ and other energy losses, φNO). As well, diel photosynthesis-irradiance curves (ETRI), built with data acquired over the 24-hour deployments, showed lower photosynthetic rates in plants from CO2 seepage sites. This unexpected pattern of photosynthetic activity will be discussed in light of the complementary data.por
dc.identifier.citationSilva J, Olivé I, Costa M, Barrote I, Procaccini G, Mazzuca S, Vizzini S, Santos R (2013) Seagrass photo-physiological responses in natural high-CO2 environment. Coastal and Estuarine Research Federation’s 22nd Biennial Conference, San Diego, California, EUA, p210.por
dc.identifier.otherAUT: IBA00639; RMS01092;
dc.identifier.urihttp://hdl.handle.net/10400.1/3332
dc.language.isoengpor
dc.peerreviewedyespor
dc.relation.publisherversionhttp://www.sgmeet.com/cerf2013/por
dc.subjectSeagrasspor
dc.subjectHigh CO2por
dc.subjectPhotophysiologypor
dc.subjectCymodocea nodosapor
dc.subjectPosidonia oceanicapor
dc.subjectCO2 ventspor
dc.subjectETR-I curvepor
dc.subjectPhotosynthesispor
dc.titleSeagrass photo-physiological responses in natural high-CO2 environmentpor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceSan Diego, California, USApor
oaire.citation.endPage210por
oaire.citation.startPage210por
oaire.citation.title21st Biennial Conference of the Coastal and Estuarine Research Federationpor
person.familyNameOlivé
person.familyNameBarrote
person.familyNameSantos
person.givenNameIrene
person.givenNameIsabel
person.givenNameRui
person.identifier42560
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-4865-923X
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-3922-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id16242114500
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id7201375018
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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relation.isAuthorOfPublication8027b4d2-ee8d-4432-be75-7a2342a905a8
relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
relation.isAuthorOfPublication.latestForDiscoveryf4552640-d88e-4323-b28a-822c85f533ff

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