THE SHORT-TERM EFFECT OF IRRADIANCE ON THE PHOTOSYNTHETIC PROPERTIES OF ANTARCTIC FAST-ICE MICROALGAL COMMUNITIES(1).

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dc.citation.issue6
dc.citation.volume45
dc.contributor.authorRyan KG
dc.contributor.authorCowie ROM
dc.contributor.authorLiggins E
dc.contributor.authorMcNaughtan D
dc.contributor.authorMartin A
dc.contributor.authorDavy SK
dc.date.available1/12/2009
dc.date.issued2009-12
dc.descriptionCAUL read and publish agreement
dc.description.abstractAlthough sea-ice represents a harsh physicochemical environment with steep gradients in temperature, light, and salinity, diverse microbial communities are present within the ice matrix. We describe here the photosynthetic responses of sea-ice microalgae to varying irradiances. Rapid light curves (RLCs) were generated using pulse amplitude fluorometry and used to derive photosynthetic yield (ΦPSII ), photosynthetic efficiency (α), and the irradiance (Ek ) at which relative electron transport rate (rETR) saturates. Surface brine algae from near the surface and bottom-ice algae were exposed to a range of irradiances from 7 to 262 μmol photons · m(-2)  · s(-1) . In surface brine algae, ΦPSII and α remained constant at all irradiances, and rETRmax peaked at 151 μmol photons · m(-2)  · s(-1) , indicating these algae are well acclimated to the irradiances to which they are normally exposed. In contrast, ΦPSII , α, and rETRmax in bottom-ice algae reduced when exposed to irradiances >26 μmol photons · m(-2)  · s(-1) , indicating a high degree of shade acclimation. In addition, the previous light history had no significant effect on the photosynthetic capacity of bottom-ice algae whether cells were gradually exposed to target irradiances over a 12 h period or were exposed immediately (light shocked). These findings indicate that bottom-ice algae are photoinhibited in a dose-dependent manner, while surface brine algae tolerate higher irradiances. Our study shows that sea-ice algae are able to adjust to changes in irradiance rapidly, and this ability to acclimate may facilitate survival and subsequent long-term acclimation to the postmelt light regime of the Southern Ocean.
dc.description.publication-statusPublished
dc.format.extent1290 - 1298 (9)
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000272837600007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationJOURNAL OF PHYCOLOGY, 2009, 45 (6), pp. 1290 - 1298 (9)
dc.identifier.doi10.1111/j.1529-8817.2009.00764.x
dc.identifier.elements-id235629
dc.identifier.harvestedMassey_Dark
dc.identifier.issn0022-3646
dc.identifier.urihttps://hdl.handle.net/10179/17390
dc.languageEnglish
dc.publisherWILEY-BLACKWELL PUBLISHING, INC
dc.relation.isPartOfJOURNAL OF PHYCOLOGY
dc.subjectScience & Technology
dc.subjectLife Sciences & Biomedicine
dc.subjectPlant Sciences
dc.subjectMarine & Freshwater Biology
dc.subjectMARINE & FRESHWATER BIOLOGY
dc.subjectPLANT SCIENCES
dc.subjectAntarctic sea ice
dc.subjectE(k)
dc.subjectPAM fluorometry
dc.subjectphotoinhibition
dc.subjectrapid light curves
dc.subjectrETR(max)
dc.subjectalpha
dc.subjectTheta(PSII)
dc.subjectSEA-ICE
dc.subjectMCMURDO-SOUND
dc.subjectPRIMARY PRODUCTIVITY
dc.subjectALGAL COMMUNITIES
dc.subjectPHOTOSYSTEM-II
dc.subjectD1 PROTEIN
dc.subjectPHOTOINHIBITION
dc.subjectPHOTOADAPTATION
dc.subjectPHOTOINACTIVATION
dc.subjectPHOTOPROTECTION
dc.subject.anzsrc0607 Plant Biology
dc.subject.anzsrc0704 Fisheries Sciences
dc.titleTHE SHORT-TERM EFFECT OF IRRADIANCE ON THE PHOTOSYNTHETIC PROPERTIES OF ANTARCTIC FAST-ICE MICROALGAL COMMUNITIES(1).
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Natural Sciences
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