Red Waters of <Emphasis Type="Italic">Myrionecta rubra</Emphasis> are Biogeochemical Hotspots for the Columbia River Estuary with Impacts on Primary/Secondary Productions and Nutrient Cycles |
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| Authors: | Lydie Herfort Tawnya D Peterson Fredrick G Prahl Lee Ann McCue Joseph A Needoba Byron C Crump G Curtis Roegner Victoria Campbell Peter Zuber |
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| Institution: | (1) Center for Coastal Margin Observation & Prediction and Division of Environmental & Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Rd, Beaverton, OR 97006, USA;(2) College of Oceanic and Atmospheric Sciences, Oregon State University, Burt 130, Corvallis, OR 97331-5503, USA;(3) Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, USA;(4) Horn Point Laboratory University of Maryland Center for Environmental Science, 2020 Horns Point Rd, Cambridge, MA 21613, USA;(5) NOAA Fisheries, Northwest Fisheries Science Center, Point Adams Biological Field Station, PO Box 155, Hammond, OR 97121, USA |
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| Abstract: | The localized impact of blooms of the mixotrophic ciliate Myrionecta rubra in the Columbia River estuary during 2007–2010 was evaluated with biogeochemical, light microscopy, physiological, and molecular data. M. rubra affected surrounding estuarine nutrient cycles, as indicated by high and low concentrations of organic nutrients and inorganic nitrogen, respectively, associated with red waters. M. rubra blooms also altered the energy transfer pattern in patches of the estuarine water that contain the ciliate by creating areas characterized by high primary production and elevated levels of fresh autochthonous particulate organic matter, therefore shifting the trophic status in emergent red water areas of the estuary from net heterotrophy towards autotrophy. The pelagic estuarine bacterial community structure was unaffected by M. rubra abundance, but red waters of the ciliate do offer a possible link between autotrophic and heterotrophic processes since they were associated with elevated dissolved organic matter and showed a tendency for enhanced microbial secondary production. Taken together, these findings suggest that M. rubra red waters are biogeochemical hotspots of the Columbia River estuary. |
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