Berthe Thierry, Touron Aurélie, Leloup Julie, Deloffre Julien, Petit Fabienne
Laboratoire de Microbiologie du Froid, UPRES 2123, Groupe Biodiversité et Environnement, UFR des Sciences, Mont Saint Aignan Cedex, France.
Mar Pollut Bull. 2008;57(1-5):59-67. doi: 10.1016/j.marpolbul.2007.10.013. Epub 2007 Nov 26.
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 x 10(4) cfu cm(-2), enterococci: 1.2 x 10(4) cfu cm(-2), Clostridium perfringens spores: 9.8 x 10(5) 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.
在三年时间里，对法国塞纳河口三个不同泥滩沉积物中的粪便指示物进行了定量分析，并对大肠杆菌和沙门氏菌进行了分子检测。同时使用高分辨率测高仪监测泥滩表面的海拔高度。在研究期间，河口泥滩是粪便指示菌的沉积区域，主要受沉积过程控制。在潮间带淡水和潮下带泥滩，粪便指示菌的丰度在沉积期最高。在高流量时期，淡水泥滩观测到最高水平：耐热大肠菌群：3.9×10⁴ cfu cm⁻²，肠球菌：1.2×10⁴ cfu cm⁻²，产气荚膜梭菌孢子：9.8×10⁵ 孢子 cm⁻²。沉积物微观世界中肠道细菌可培养性的丧失证明了泥滩的修复能力，即使它们可能通过侵蚀和再悬浮事件成为水柱中形成芽孢细菌的次要来源。
