Imaging Of Oxygen Dynamics Within The Endolithic Algal Community Of The Massive Coral Porites Lobata
- Kuhl, M
- Holst, G
- Larkum, A
- Ralph, P
DOIAbstract
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 sect...
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