Diel Fluctuations in the Abundance and Community Diversity of Coastal Bacterioplankton Assemblages over a Tidal Cycle |
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Authors: | Email author" target="_blank">Ola?A?OlapadeEmail author |
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Institution: | (1) Department of Biology and the Center for Sustainability and the Environment, 611 East Porter Street, Albion College, Albion, MI 49224, USA |
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Abstract: | The diel change in abundance and community diversity of the bacterioplankton assemblages within the Pacific Ocean at a fixed
location in Monterey Bay, California (USA) were examined with several culture-independent (i.e., nucleic acid staining, fluorescence
in situ hybridization {FISH}, and 16S ribosomal RNA gene libraries) approaches over a tidal cycle. FISH analyses revealed
the quantitative predominance of bacterial members belonging to the Cytophaga-Flavobacterium cluster as well as two Proteobacteria (α- and γ-) subclasses within the bacterioplankton assemblages, especially during high tide (HT) and outgoing tide (OT) than
the other tidal events. While the clone libraries showed that majority of the sequences were similar to the 16S rRNA gene
sequences of unknown bacteria (32% to 73%), however, the operational taxonomic units from members of the α-Proteobacteria, Bacteroidetes, Firmicutes, and Cyanobacteria were also well represented during the four tidal events examined. Comparatively, sequence diversity was highest in OT, lowest
in low tide, and very similar between HT and incoming tide. The results indicate that the dynamics of bacterial occurrence
and diversity appeared to be more pronounced during HT and OT, further indicative of the ecological importance of several
environmental variables including temperature, light intensity, and nutrient availability that are also concurrently fluctuating
during these tidal events in marine systems. |
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Keywords: | |
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