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The Adaptive Bleaching Hypothesis: Experimental Tests of Critical Assumptions

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dc.contributorScott Santos, santosr@auburn.eduen_US
dc.creatorKinzie, R. A
dc.creatorTakayama, M
dc.creatorSantos, S.R
dc.creatorCoffroth, M. A.
dc.description.abstractCoral bleaching, the loss of color due to loss of symbiotic zooxanthellae or their pigment, appears to be increasing in intensity and geographic extent, perhaps related to increasing sea surface temperatures. The adaptive bleaching hypothesis (ABH) posits that when environmental circumstances change, the loss of one or more kinds of zooxanthellae is rapidly, sometimes unnoticeably, followed by formation of a new symbiotic consortium with different zooxanthellae that are more suited to the new conditions in the host's habitat. Fundamental assumptions of the ABH include (1) different types of zooxanthellae respond differently to environmental conditions, specifically temperature, and (2) bleached adults can secondarily acquire zooxanthellae from the environment. We present simple tests of these assumptions and show that (1) genetically different strains of zooxanthellae exhibit different responses to elevated temperature, (2) bleached adult hosts can acquire algal symbionts with an apparently dose-dependent relationship between the concentration of zooxanthellae and the rate of establishment of the symbiosis, (3) and finally, bleached adult hosts can acquire symbionts from the water column.en_US
dc.publisherGrants-inAid for Scientific Research from the Ministry of Education, Science,Sports and Culture of Japan n, and the A. Y. Yoshinaga foundation; NSF; NSF minority fellowship;en_US
dc.relation.ispartofThe Biological Bulletinen_US
dc.rights© 2001. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.subjectCoral bleachingen_US
dc.subjectSymbiotic zooxanthellaeen_US
dc.subjectSea temperatureen_US
dc.subjectCoral reefen_US
dc.titleThe Adaptive Bleaching Hypothesis: Experimental Tests of Critical Assumptionsen_US
dc.type.genreJournal Article, Academic Journalen_US

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