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Biodeposition in a juvenile mussel bed of the east Frisian Wadden Sea (Southern North Sea)

  • Sediment and Particle Dynamics
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Abstract

Seasonal trends of biodeposition and animal coverage in backbarrier beds of the musselMytilus edulis in the East Frisian Wadden Sea were documented and quantified to assess the effects of physical disturbance by storms and to develop a conceptual model for the interpretation of biodeposits in the stratigraphic record. Accretion and erosion of biogenic muds (faeces and pseudofaeces) were quantified by repeated precision levelling of a 12 m2 test area. Animal coverage was documented by vertical photography prior to each levelling survey. Levelling and photography were conducted from a bridge and rail system to avoid physical disturbance by trampling. Four surveys, covering a period of different weather conditions, showed variable mean accretion/erosion rates of biodeposits ranging from +0.56 mm d−1 (accretion) to −1.34 mm d−1 (erosion) and areal coverage of mussels ranging from 39.1% to 0%. A pronounced seasonal trend in the biodepositional pattern was observed. Mean accretion rates were high (>0.5 mm d−1) during the summer season, whereas in the winter season net deposition decreased to zero or showed erosional trends. Longterm sediment budgets are thus composed of highly variable mean annual rates which, in turn, comprise highly variable seasonal and even monthly rates, depending on the local weather pattern. This forms the basis for a conceptual model, in terms of which the stratigraphic record of fossil biodeposits can be meaningfully interpreted.

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Flemming, B.W., Delafontaine, M.T. Biodeposition in a juvenile mussel bed of the east Frisian Wadden Sea (Southern North Sea). Netherlands Journal of Aquatic Ecology 28, 289–297 (1994). https://doi.org/10.1007/BF02334197

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