Seasonal changes in diatom biomass, sediment stability and biogenic stabilization in the Severn Estuary

Journal of the Marine Biological Association of the United Kingdom - Tập 73 Số 4 - Trang 871-887 - 1993
Graham J. C. Underwood1, D. S. McKay2
1Department of Botany, University of Bristol, Woodland Road, Bristol, BS8 1UG
2†Gatty Marine Laboratory, The University, St Andrews, Fife, KYI6 8LB

Tóm tắt

Epipelic diatoms represented the dominant microphy tobenthos on the intertidal mudflats of the Severn Estuary, south-western Britain. Algal biomass (measured as chlorophyllaconcentration) varied over a seasonal cycle and was strongly correlated with sediment shear strength and critical shear stress and therefore with position on the shore. High levels of diatom biomass were positively correlated with the concentration of colloidal carbohydrate within the surface sediments. The critical shear strength for incipient erosion was significantly correlated with position on the shore (moisture content) and with both chlorophyllaand colloidal carbohydrate, the latter being the best biochemical predictor for the incipient erosion threshold. The range of stress required to cause incipient erosion varied from 1.0 to 8.0 N m-2, with the sediment increasing in resistance landwards. Two-way analysis of variance using both moisture content and colloidal carbohydrate as variables explained the stability of the sediment better than individual pair-wise comparisons.

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Journal of the Marine Biological Association of the United Kingdom

Tập 73 Số 4

871-887

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