Biological disturbance and camouflage of sedimentary features on the Northeast United States slope and rise |
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| Authors: | Evan B Forde Suzanne Danner Ulrich Barbara Hecker |
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| Institution: | (1) National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, 33149 Miami, FL, USA;(2) Lamont-Doherty Geological Observatory of Columbia University, 10964 Palisades, NY, USA |
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| Abstract: | Evidence from over 200 sediment cores, numerous submersible dives, and bottom photographs prove that bioturbation and bioerosion are ongoing processes affecting northeastern U.S. continental slope and rise sedimentation. Evidence of biological activity was found in greater than 95% of the cores examined. Submersible dive observations reveal that the results of biological activity often dominate sea-floor microtopography. Bioturbation can disturb sediments several centimeters deep in a matter of seconds and is in some areas the primary sediment transport mechanism. Many cores with sandy intervals were profoundly disturbed by bioturbation. Biologically camouflaged sand-rich intervals can easily be missed by visual observation. |
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