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- W2058632610 abstract "Concurrent acoustical, physical, and biological properties were measured from replicate core liner and box-core samples collected by SCUBA divers from each of two locations in Long Island Sound, 27–28 August, 1980. A very low diversity pioneer assemblage dominated by the filter-feeding bivalve Mulinia lateralis was found at the shallower (10 m water depth) FOAM site. Nearby sediments were dominated by surface-dwelling tubiculous polychaetes and amphipods. Sediment laminations produced by storm-induced erosional and depositional events were preserved at the FOAM site because sediment mixing by macrofauna was uncommon below the upper few centimeters of sediment. Horizontal patchiness of macrofauna and preservation of sediment laminations resulted in vertical and horizontal variability of sediment physical and acoustical properties. Spatial and temporal changes of dominant species at the FOAM site resulted in considerable large scale (10–100 m) variability of physical and acoustical properties of surficial sediment. A low-diversity equilibrium assemblage dominated by surface deposit-feeding bivalves and deeper-dwelling errant and tubiculous polychaetes was found at the deeper (16 m water depth) NWC site. Intense bioturbation by surface deposit-feeding bivalves precluded preservation of primary laminations created by storm-induced erosional and depositional events. Bioturbation was responsible for spatial and temporal large-scale homogeneity of physical and acoustical properties of NWC sediments. Deeper-dwelling polychaetes mixed sediment to depths of 15 cm, creating random variability of fine-scale physical and acoustical structure by production of burrows, tubes and feeding voids, and by mixing shell remains throughout the upper 15 cm. Physical and acoustical properties of many coastal marine sediments are controlled by the interaction of biological and hydrodynamic processes. Study of relationships between these two processes and resultant sedimentary properties should lead to improvement of predictive geoacoustic models for coastal environments, especially where high levels of biological activity are expected." @default.
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- W2058632610 date "1983-07-01" @default.
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- W2058632610 title "Effects of hydrodynamic and biological processes on sediment geoacoustic properties in Long Island Sound, U.S.A." @default.
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- W2058632610 doi "https://doi.org/10.1016/0025-3227(83)90056-7" @default.
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