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| Wilson, Jg. |
| Changes in the Tellina tenuis population in Dublin Bay, Ireland since 1977 are described. Population density at the monitoring site increased from 260 m(-2) (although a maximum density of 548 m(-2) was found nearby) in 1977 to a peak of 434 m(-2) in 1989. Densities recently have been the lowest recorded, around 170 m(-2). These changes do not seem to have been associated with any change in elevation of the site. The population structure has changed considerably, from one dominated by larger, older animals in 1977, when there did not seem to have been any significant recruitment for the previous two years, to one in which recruitment, if not in any great numbers, has at least been more or less regular, with the last two years (1993 and 1994) showing the... |
| Tipo: Text |
Palavras-chave: Tellina tenuis; Long-term; Population; Growth; Ireland. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20396/18063.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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