alexa Ecological physiology of the black band disease cyanobacterium Phormidium corallyticum
Environmental Sciences

Environmental Sciences

Journal of Biodiversity & Endangered Species

Author(s): Laurie L Richardson, Kevin G Kuta

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Laboratory studies were carried out to assess the photosynthetic and nitrogen-fixing capabilities of the gliding, filamentous cyanobacterium Phormidium corallyticum . This species is found on coral reefs, and is one of the members of a pathogenic microbial consortium called black band disease of corals, a unique horizontally migrating microbial mat with an active sulfuretum. It was determined that P. corallyticum can perform oxygenic photosynthesis in the presence or absence of sulfide, but cannot conduct (DCMU- forced) anoxygenic photosynthesis with sulfide as electron donor. Photosynthesis vs. irradiance curves revealed a very low threshold for Pmax of 6 30 W Em 3 2 s 3 1 . Temperature optima for photosynthetic activity were at and above 30‡C. Neither a laboratory culture of P. corallyticum nor freshly collected samples of the black band microbial consortium were capable of fixing N 2 . Results are discussed in terms of the ecology of this coral disease.

This article was published in FEMS Microbial Ecol and referenced in Journal of Biodiversity & Endangered Species

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