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| Loquet, N; Rybarczyk, H; Elkaim, B. |
| The Bay of Somme is the second ranked estuarine system, after the Seine estuary, on the French coasts of the Eastern Channel. The nutrient retention and regeneration capacities of this estuary have been calculated from continental and coastal hydrological data and from estimation of the residence time. Measurements at the mouths of the main rivers over a one-year period (from October 1994 to November 1995) were used to construct a budget of continental inputs which showed that the smaller rivers could, at times, be important contributors. The annual budget shows continental inputs of nitrogen, phosphorus, silicon and suspended particulate matter of 9 000 t . y(-1), 380 t . y(-1), 5 400 t y(-1) and 67 800 t . y(-1). Estimation of coastal inputs to the... |
| Tipo: Text |
Palavras-chave: Manche; Baie de Somme; Flux de nutriments; Production primaire; English Channel; Bay of Somme; Nutrient fluxes; Primary production. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00325/43577/44045.pdf |
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| Rybarczyk, H; Elkaim, B; Wilson, Jg; Loquet, N. |
| Massive mortalities of the benthic fauna, notably the cockle Cerastoderma edule, a commercially exploited species, were observed in the Pale de Somme in 1982, 1983, 1985, 1989 and 1990. Measurements of oxygen saturation levels of the surface water provided evidence of oxygen depletion (65% in 1989 and 62% in 1990). Oxygen saturation was inversely related to phaeopigment a concentrations due to eutrophication, leading to the depletion of oxygen or anoxia and initiating the mortalities, which were important and localized in areas where water persisted at low tide: intertidal pools, films of water on the sediment surface. From laboratory and field experiments, a simple model of the anoxia in intertidal water pools was constructed, based on the oxygen... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00093/20474/18144.pdf |
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