Imaging Of Oxygen Dynamics Within The Endolithic Algal Community Of The Massive Coral Porites Lobata

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Show simple item record Kuhl Michael en_US Holst Gerhard en_US Larkum Anthony en_US Ralph Peter en_US
dc.contributor.editor en_US 2010-05-28T09:45:01Z 2010-05-28T09:45:01Z 2008 en_US
dc.identifier 2009004036 en_US
dc.identifier.citation Kuhl Michael et al. 2008, 'Imaging Of Oxygen Dynamics Within The Endolithic Algal Community Of The Massive Coral Porites Lobata', Journal of Phycology, Wiley-Blackwell, USA en_US
dc.identifier.issn 0022-3646 en_US
dc.identifier.other C1 en_US
dc.description.abstract We used transparent planar oxygen optodes and a luminescence lifetime imaging system to map (at a pixel resolution of <200 ?m) the two-dimensional distribution of O2 within the skeleton of a Porites lobata colony. The O2 distribution was closely correlated to the distribution of the predominant endolithic microalga, Ostreobium quekettii Bornet et Flahault that formed a distinct green band inside the skeleton. Oxygen production followed the outline of the Ostreobium band, and photosynthetic O2 production was detected at only 0.2 ?mol photons m-2 · s-1, while saturation occurred at ?37 ?mol photons m-2 · s-1. Oxygen levels varied from ?60% to 0% air saturation in the illuminated section of the coral skeleton in comparison to the darkened section. The O2 production within the Ostreobium band was lower in the region below the upward facing surface of the coral and elevated on the sides. Oxygen consumption in darkness was also greatest within the Ostreobium zone, as well as in the white skeleton zone immediately below the corallites. The rate of O2 depletion was not constant within zones and between zones, showing pronounced heterogeneity in endolithic respiration. When the coral was placed in darkness after a period of illumination, O2 levels declined by 50% within 20 min and approached steady-state after 40-50 min in darkness. Our study demonstrates the use of an important new tool in endolith photobiology and presents the first data of spatially resolved O2 concentration and its correlation to the physical structures and specific zones responsible for O2 production and consumption within the coral skeleton. en_US
dc.language en_US
dc.publisher Wiley-Blackwell en_US
dc.relation.isbasedon en_US
dc.title Imaging Of Oxygen Dynamics Within The Endolithic Algal Community Of The Massive Coral Porites Lobata en_US
dc.parent Journal of Phycology en_US
dc.journal.volume 44 en_US
dc.journal.number 3 en_US
dc.publocation USA en_US
dc.identifier.startpage 541 en_US
dc.identifier.endpage 550 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060700 en_US
dc.personcode 0000043169;107129;0000016444;890085 en_US
dc.percentage 000100 en_US Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords endolithic; imaging; microenvironment; optode; Ostreobium quekettii; oxygen en_US
dc.staffid PCO AG, Research & Development;University of Copenhagen en_US
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10

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