Abstract
The macrobenthic fauna in the tidal freshwater James River, Virginia, USA, exhibited a high degree of resilience and limited temporal response to sediment disturbance caused by large quantities of low bulk density (> 1.3 g cm-3) fluid mud. The fluid mud was produced by hydraulic dredge deepening of a ship channel with disposal of dredged sediments onto a nearby shoal. The response of tidal freshwater communities to fluid mud was limited to mainly quantitative changes in abundance of dominant taxa (Limnodrilus spp., L. hoffmeisteri, Ilyodrilus templetoni, Corbicula fluminea, Coelotanypus scapularis) and was directly related to the thickness of fluid mud layers. Disturbance effects were short lived and for tubificids most obvious in areas with <0.3 m fluid mud. In areas that received >0.3 m fluid mud, acute effects were limited to chironomids and small (< 10 mm) C. fluminea. The fauna colonizing the areas disturbed by fluid mud was the same as that inhabiting the shoal prior to disturbance. There was no indication of a successional sequence, as reported for other freshwater and marine habitats. Three weeks after the disturbance ended, all but a few insect taxa had recolonized. Changes in community structure from fluid mud disturbance were slight with total taxa best characterizing the disturbance. The insensitivity of community structure measures reflects the high resiliency of macrobenthic communities to physical stresses in tidal freshwater systems.
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© 1994 Springer Science+Business Media Dordrecht
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Diaz, R.J. (1994). Response of tidal freshwater macrobenthos to sediment disturbance. In: Reynoldson, T.B., Coates, K.A. (eds) Aquatic Oligochaete Biology V. Developments in Hydrobiology, vol 95. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0842-3_23
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DOI: https://doi.org/10.1007/978-94-011-0842-3_23
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