Publication Detail

Size-selective Downward Particle Transport by cirratulid polychaetes.

David H Shull, Michie Yasuda
21 pp.
MITSG 01-18J
$6.50 domestic; 11.00 outside the U.S.A. DOM

The deposition of surficial sediments below the sediment- water interface due to the reworking activities of organisms has important consequences for bioturbation rates and sediment geochemistry, and is much more likely to be size dependent than other sediment-mixing mechanisms. The authors of this study examined the mechanisms behind downward particle transport in Boston Harbor. Laboratory observations indicated that a large curratulid polychaete, "Cirriformia grandis," collected particles (glass beads) near the sediment surface and deposited them at depth. A mathematical model was developed to simulate the feeding and burrowing mechanisms of "C. grandis" and to predict the vertical profiles of tracer particles of assorted sizes in the field.

type: Technical reports

Parent Project

Project No.: 2003-R/RC-88
Title: Rates and Mechanisms of Mercury Methylation in Marine Coastal Sediments

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