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Evolution des populations planctoniques animales en Manche et au sud de la Mer du Nord ArchiMer
Le Fevre-lehoeerff, G; Grossel, H; Derrien, A.
Observations have been made on time variation in the physical, chemical and biological characteristics of the pelagic ecosystem. Simultaneous studies in different places also shows evidence for space variations. Differences between years in zooplankton species abundance are linked to principal climatic events (flow of large rivers, extreme temperatures). A better understanding of differences in zooplankton between nearby places has been obtained by taking into account the coastal configuration currents systems and water stability.
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Ano: 1983 URL: http://archimer.ifremer.fr/doc/00246/35772/34285.pdf
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Rejets urbains et contamination fecale ArchiMer
Pommepuy, Monique; Dupray, Elisabeth; Guillaud, Jean-francois; Derrien, A; L'Yavanc, Jacky; Cormier, M.
The behaviour of fecal bacteria was investigated in a turbid estuary which is also a shellfishing area. Sediments are polluted by sewage by the way of settlement, fecal bacteria mixed with estuarine water being able to survive a very long time (T90 are about several days). By measuring the increase of salt tolerance of the strains grown in natural estuarine organic matter, it was demonstrated that Escherichia coli is able to support the salinity of coastal water. Moreover, because light penetration is obstructed by suspended matter, the solar bactericidal effect is very low. A close relationship between T90 and light intensity received by the bacteria is found. These mechanisms can explain the low die-off rate found in turbid areas.
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00267/37860/35941.pdf
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