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Article Dans Une Revue Marine Pollution Bulletin Année : 2008

Faecal-indicator bacteria and sedimentary processes in estuarine mudflats (Seine, France)

Résumé

Over a three-year period, quantification of faecal indicators and the molecular detection of Escherichia coli and Salmonella were monitored in sediments from three contrasting mudflats of the Seine estuary (France). The elevation of the mudflat surface was monitored concurrently using a high-resolution altimeter. During the period of the study, estuarine mudflats were areas of deposition for faecal-indicator bacteria and were mainly controlled by sedimentary processes. In the intertidal freshwater and subtidal mudflats, the highest abundances of faecal-indicator bacteria were counted during a depositional period. Maximum levels were observed in the freshwater mudflats during periods of high flow: thermotolerant coliforms: 3.9 × 104 cfu cm−2, enterococci: 1.2 × 104 cfu cm−2, Clostridium perfringens spores: 9.8 × 105 spores cm−2. Loss of culturability of enteric bacteria in sediment microcosms demonstrated the remediatory capacity of the mudflats, even if they might be a secondary source of bacteria-forming spores to the water column through erosion and resuspension events.

Dates et versions

hal-00333441 , version 1 (23-10-2008)

Identifiants

Citer

Thierry Berthe, A. Touron, J. Leloup, Julien Deloffre, F. Petit. Faecal-indicator bacteria and sedimentary processes in estuarine mudflats (Seine, France). Marine Pollution Bulletin, 2008, 57 (1-5), pp.59-67. ⟨10.1016/j.marpolbul.2007.10.013⟩. ⟨hal-00333441⟩
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