Microbial activities on Trichodesmium colonies

The microbial and metazoan community associated with colonies of Trichodesmium spp.: a quantitative survey

Organisms living in the open ocean must survive in a challenging environment often characterized by low nutrient levels. Subtropical open-ocean gyres, such as the Sargasso Sea, are examples of such extremely oligotrophic marine systems. Subtropical gyres are characterized by chronic (nitrogenous) nutrient depletion and low standing stocks of organisms (Pinet, 1992; Karl, 1999). Plankton can sur...

Intense ectoenzyme activities associated with Trichodesmium colonies in the Sargasso Sea

Ectoenzyme activities of alkaline phosphatase (APA) and leucine aminopeptidase (LAP) associated with Trichodesmium, a globally significant dinitrogen (N2) fixer, were measured on cruises to the Bermuda Atlantic Time-Series (BATS) site. Rates associated with Trichodesmium were compared to microbial enzyme activities in natural seawater between August 1992 and November 1997. Colonies of Trichodes...

Microbiome of Trichodesmium Colonies from the North Pacific Subtropical Gyre

Filamentous diazotrophic Cyanobacteria of the genus Trichodesmium, often found in colonial form, provide an important source of new nitrogen to tropical and subtropical marine ecosystems. Colonies are composed of several clades of Trichodesmium in association with a diverse community of bacterial and eukaryotic epibionts. We used high-throughput 16S rRNA and nifH gene sequencing, carbon (C) and...

Genetic diversity of the pelagic harpacticoid copepod Macrosetella gracilis on colonies of the cyanobacterium Trichodesmium spp

The harpacticoid copepod Macrosetella gracilis uses colonies of the nitrogen-fixing cyanobacterium Trichodesmium spp. as a floating substrate and nursery. This association enables the copepod to lead a pelagic existence. Molecular and morphological data both indicate that M. gracilis is maintained as a single, circumglobal species across the tropical and subtropical Atlantic and Pacific. Mitoch...

Intercellular Genomics of Subsurface Microbial Colonies