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| Lagadeuc, Y. |
| The objective of this study is to understand the influence on larval transport of the different hydrodynamic factors present in the English Channel. A population of annelid polychaetes, Pectinaria koreni, and a site, the Seine Bay, were chosen as being particularly appropriate for such a study. Different patterns of larval transport were observed during an intensive sampling season in 1987. The first pattern corresponds to the average residual transport which is dominated by tide: larvae are mainly transported northward. and a larval retention exists near the mouth of the estuary due to the interaction between the vertical current structure and the vertical distribution of larvae. The other patterns are wind-driven. Larvae are transported northward with... |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00100/21171/18789.pdf |
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| Lagadeuc, Y. |
| Variations in recruitment of benthic invertebrate species with pelagic larvae, which inhabit estuaries, can be reduced by the vertical distribution of larvae. In fact, they may be located in water masses in which net transport favours retention in the vicinity of estuaries. Such a hypothesis can explain the Pectinaria koreni population stability in the western bay of Seine. The vertical distribution of P. koreni larvae is in relation to the turbulence level. When turbulence is low, strong water stratification is present, and larvae are then most abundant under the halocline (in water masses where salinity is more than 30.5). Moreover, a strong ontogenetic migration is observed : young larvae occupy the upper part of the water column and old larvae the... |
| Tipo: Text |
Palavras-chave: VERTICAL DISTRIBUTION; PECTINARIA-KORENI; LARVAL TRANSPORT; RECRUITMENT; BAY OF SEINE. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00101/21243/18858.pdf |
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| Brylinski, J M; Lagadeuc, Y; Gentilhomme, V; Dupont, J P; Lafite, R; Dupeuble, P A; Huault, M F; Auger, Y. |
| The English Channel has a "megatidal" regime: in the Dover Strait, the tidal range varies between 3 and 9 m in neap-tide and spring-tide respectively. The tide currents are alternating and essentially parallel to the coast. Along the French coast, the fluvial supplies, distributed from the Bay of Seine to Cape Gris-Nez, generate a coastal water mass which drifts nearshore, separated from the open sea by a frontal area: this coastal flow is characterized by its freshness, turbidity, phytoplankton richness, and pollution content. Its width is only 3 to 5 miles, but because of the high concentrations of dissolved and suspended components, it is possible that the coastal flow plays an important role in the fluxes between the Eastern Channel and the North Sea. |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00268/37874/35955.pdf |
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