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Type: Journal article
Title: Effects of kelp canopies on bleaching and photosynthetic activity of encrusting coralline algae
Author: Irving, A.
Connell, S.
Elsdon, T.
Citation: Journal of Experimental Marine Biology and Ecology, 2004; 310(1):1-12
Publisher: Elsevier Science BV
Issue Date: 2004
ISSN: 0022-0981
Statement of
Andrew D. Irving, Sean D. Connell and Travis S. Elsdon
Abstract: Canopy-forming algae often coexist with an understorey of encrusting coralline algae that bleach following the loss of canopies. We tested the hypothesis that canopy loss causes a reduction in photosynthetic activity of encrusting coralline algae concomitant with their bleaching. When canopies were experimentally removed, corallines bleached and their photosynthetic activity was rapidly reduced to half their activity observed under canopies. This result prompted us to test, and subsequently accept, the hypothesis that exposure of understorey corallines to enhanced light intensity per se (simulation of canopy loss) acts as a mechanism that causes bleaching and reduced photosynthetic activity. Despite bleaching, encrusting corallines maintained reduced levels of photosynthetic activity, and this may explain why, under certain conditions, bleached corallines can persist in the absence of canopy-forming algae. Nevertheless, our data provide evidence that the positive association between canopy-forming algae and encrusting coralline algae is maintained because of shade provided by the canopy.
Keywords: Canopy
Ecklonia radiata
Nongeniculate coralline
Description: Copyright © 2004 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.jembe.2004.03.020
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Appears in Collections:Aurora harvest 6
Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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