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Compared photophysiology of native seagrasses with an invasive macroalga in Sydney Harbour, Australia

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dc.contributor.authorSilva, João
dc.contributor.authorRuncie, J. W.
dc.contributor.authorBarrote, Isabel
dc.contributor.authorCosta, Monya
dc.contributor.authorSantos, Rui
dc.date.accessioned2014-01-06T11:41:06Z
dc.date.available2014-01-06T11:41:06Z
dc.date.issued2012
dc.description.abstractThe comparative photophysiology of the seagrasses Zostera capricorni and Halophila ovalis and the invasive macroalgae Caulerpa taxifolia was investigated in a shallow mixed meadow at Chowder Bay (Sydney, Australia), where the three species coexist. This study was developed under the auspices of the COST Action “Seagrasses: from genes to ecosystems”, targeting one of its objectives, the development of innovative devices for the continuous measurement of seagrass photosynthesis. Automated multi-channel chlorophyll fluorometers were deployed for 24-hour periods to examine and compare the changes in the photosynthetic efficiency and energy quenching mechanisms of the 3 species. Tissue samples were collected at predawn and noon, frozen and analysed by HPLC for detailed pigment analysis. The invasive C. taxifolia showed generally higher photosynthetic efficiency than both Z. capricorni and H. ovalis. Both seagrass species showed down-regulation of photosynthesis at noon, evidenced by the low quantum yield and the significant reduction of the antennae pigments between pre-dawn and noon. In contrast, C. taxifolia showed no reduction in antennae pigments or total photosynthetic pigments along the day. While both seagrasses showed 3- to 7-fold increases in the epoxidation state of xanthophyll cycle pigments between pre-dawn and noon, in C. taxifolia there was no significant change. Our results show that C. taxifolia is better adapted to high light conditions than Z. capricorni and H. ovalis, which means that, from the photophysiological point of view, this invasive macroalgae constitutes a serious competitor for seagrasses in shallow areas with high irradiance.por
dc.identifier.citationSilva J, Runcie J, Barrote I, Costa M, Santos R (2012) Compared photophysiology of native seagrasses with an invasive macroalga in Sydney Harbour, Australia. Proceedings of the 10th International Seagrass Biology Workshop (ISBW10), Armação dos Búzios, Brasil (J C Creed and S S Oigman-Pszczol, eds). Instituto Biodiversidade Marinha, Rio de Janeiro, Brazil, p 60por
dc.identifier.otherAUT: IBA00639; MROS00812;
dc.identifier.urihttp://hdl.handle.net/10400.1/3277
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherInstituto Biodiversidade Marinhapor
dc.subjectZostera capricornipor
dc.subjectHalophila ovalispor
dc.subjectCaulerpa taxifoliapor
dc.subjectPhotosynthesispor
dc.subjectChlorophyll fluorescencepor
dc.subjectPhotosynthetic pigmentspor
dc.subjectXanthphyll cyclepor
dc.titleCompared photophysiology of native seagrasses with an invasive macroalga in Sydney Harbour, Australiapor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceArmação dos Búzios, Rio de Janeiro, Brasilpor
oaire.citation.endPage60por
oaire.citation.startPage60por
oaire.citation.title10th International Seagrass Biology Workshoppor
person.familyNameSilva
person.familyNameBarrote
person.familyNameSantos
person.givenNameJoão
person.givenNameIsabel
person.givenNameRui
person.identifier82814
person.identifier42560
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.ciencia-id801C-0AE4-B5CA
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0002-7211-1661
person.identifier.orcid0000-0002-0922-0259
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-7874-2013
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id7403023547
person.identifier.scopus-author-id8659654200
person.identifier.scopus-author-id7201375018
rcaap.rightsrestrictedAccesspor
rcaap.typeconferenceObjectpor
relation.isAuthorOfPublication61040b53-b17a-40f6-b42e-f5476a7a6ddb
relation.isAuthorOfPublication8027b4d2-ee8d-4432-be75-7a2342a905a8
relation.isAuthorOfPublication84487ca8-404a-4584-81f0-3662c340d712
relation.isAuthorOfPublication.latestForDiscovery84487ca8-404a-4584-81f0-3662c340d712

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