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- W1034652425 abstract "Active and passive mechanisms utilized by many organisms in marsh-estuarine ecosystems couple the water column to the bottom. These linkages are often engineered by dense populations of plants (marshes) or animals (beds and reefs) that use their organismic structure, i.e., bodies or shells, and functional processes, i.e., water pumping, suspension feeding, etc., to enhance the movement of materials between the two habitats. These adaptations to the benthic boundary layer result in organismically mediated fluxes of materials between the water and the bottom that may dramatically alter either or both habitats. Dense stiff blades of grass dominate the salt marsh component of marsh-estuarine ecosystems. This structure ensures low water flow, low shear velocities, high drag and high roughness at the benthic boundary. These physical factors allow molecular diffusion and sedimentation to dominate exchange mechanisms. Marsh mussels magnify benthic-pelagic coupling by their active pumping and filtration of water. The shells of bivalve beds form a rough benthic surface that enhances turbulent mixing and increases the width of the benthic boundary layer. These beds can remove, via sedimentation (passive) and filtration (active) mechanisms, enormous quantities of suspended materials (phytoplankton, etc.) from the water and release, as a result of metabolism, large amounts of dissolved inorganic substances into tidal currents. In some systems, bivalve beds are equivalent to saltmarshes in processing materials. There have been few studies on benthic-pelagic coupling by marsh-estuarine mudflats. In marsh related mudflats, there is low water flow, shear velocities, drag and smooth surfaces. Both passive and active coupling mechanisms are common to mudflats, but there is little direct information available. The high ratio of bottom surface area to tidal water volume over these flats suggests a great potential for material exchanges. At the system level, coupling processes directly involve marshes and animals in the cycling of major nutrients not only within the shallow tidal marsh-estuarine ecosystem, but also with the adjacent coastal ocean. The magnitude of these system level couplings has only been identified in a few locations, but they are almost always related to high productivity sub-systems, i.e., mussel beds and oyster reefs.KeywordsSalt MarshFlow EnvironmentMarine Ecology Progress SeriesSuspension FeederOyster ReefThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
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- W1034652425 date "2005-12-30" @default.
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- W1034652425 title "Benthic-Pelagic Coupling in Marsh-Estuarine Ecosystems" @default.
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- W1034652425 doi "https://doi.org/10.1007/0-306-47534-0_17" @default.
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