The response of meiofauna to sediment disturbance

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Abstract

The meiobenthos inhabiting an intertidal mud bar were disturbed by hand-turning the sediment of a 9-m2 area with a shovel and monitoring the subsequent recolonization process.

The immediate impact of the disturbance on this community dominated by Nematoda (91%), Copepoda (4%) and Foraminifera (4%), was to remove more than 70% of the meiofauna. However, after only one tidal cycle, total numbers of nematodes, copepods, foraminiferans and other meiofauna taxa were at predisturbance and control (similar 9-m2 site on the same flat) density values. Nematode species assemblages rapidly adapted to the disturbance and changed little over time. Foraminifera showed insignificant fluidized flocculent upper layer of sediment was probably the major dispersal mechanism in this community, and foraminiferans seem to be the least able to use this mechanism.

The meiobenthos of this habitat is described as a well-dispersed and dynamic community able to rapidly adjust to small-scale disturbances. However, the meiobenthos may not recover from all disturbances, because resilience was only determined for a limited physical disturbance.

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    Contribution No. 329 from the Belle W. Baruch Institute for Marine Biology and Coastal Research, University of South Carolina.

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    Present address: Department of Oceanography, Florida State University, Tallahassee, FL 32306, U.S.A.

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