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Molecular analyses of the diversity in marine bacterioplankton assemblages along the coastline of the northeastern Gulf of Mexico.

Bacterial community diversity in marine bacterioplankton assemblages were examined in 3 coastal locations along the northeastern Gulf of Mexico (GOM) using 16S rRNA gene libraries and fluorescence in situ hybridization approaches. The majority of the sequences (30%-60%) were similar to the 16S rRNA gene sequences of unknown bacteria; however, the operational taxonomic units from members of the Cyanobacteria, Proteobacteria, and Bacteroidetes were also present at the 3 GOM sites. Overall, sequence diversity was more similar between the Gulf sites of Carrabelle and Ochlockonee than between either of the Gulf sites and Apalachicola Bay. Fluorescence in situ hybridization analyses revealed the quantitative predominance of members of the Alphaproteobacteria subclass and the Cytophaga-Flavobacterium cluster within the bacterioplankton assemblages. In general, the study further reveals the presence of many bacterial taxa that have been previously found to be dominant in coastal marine environments. Differences observed in the representation of the various bacterial phylogenetic groups among the GOM coastal sites could be partly attributed to dynamic variations in several site-specific conditions, including intermittent tidal events, nutrient availability, and anthropogenic influences.