Abstract
Coastal zones encompass a complex spectrum of environmental gradients that each impact the composition of bacterioplankton communities. Few studies have attempted to address these gradients comprehensively. We generated a synoptic, 16S rRNA gene-based bacterioplankton community profile of a coastal zone by applying the fingerprinting technique denaturing gradient gel electrophoresis to water samples collected from the Columbia River, estuary, and plume, and along coastal transects covering 360 km of the Oregon and Washington coasts and extending to the deep ocean (>2,000 m). Communities were found to cluster into five distinct groups based on location in the system (ANOSIM, p < 0.003): estuary, plume, epipelagic, shelf bottom (depth < 150 m), and slope bottom (depth > 650 m). Across all environments, abiotic factors (salinity, temperature, depth) explained most of the community variability (ρ = 0.734). But within each coastal environment, biotic factors explained most of the variability. Thus, structuring physical factors in coastal zones, such as salinity and temperature, define the boundaries of many distinct microbial habitats, but within these habitats variability in microbial communities is explained by biological gradients in primary and secondary productivity.
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Acknowledgments
This study was carried out within the context of the Science and Technology Center for Coastal Marine Observation & Prediction (CMOP) supported by the National Science Foundation (grant number OCE-0424602 to Antonio Baptista). We thank the crew of the R/V Wecoma, Lydie Herfort for field planning and assistance, Joanna Green and Erica Kiss for bacterial production measurements and laboratory assistance, Suzanne DeLorenzo-Kroll and Daniel Murphy for help in sample collection, and Joe Jennings, Marnie Jo Zirbel, and Ricardo Letelier for inorganic nutrient and pigment analyses.
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Fortunato, C.S., Crump, B.C. Bacterioplankton Community Variation Across River to Ocean Environmental Gradients. Microb Ecol 62, 374–382 (2011). https://doi.org/10.1007/s00248-011-9805-z
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DOI: https://doi.org/10.1007/s00248-011-9805-z