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| Guillou, M; Michel, C. |
| In Brittany, the edible sea-urchin Sphaerechinus granularis (Lamarck) is at the northern limit of its range. Small-scale exploitation of this species occurs in the Glenan islands, in the bay of Concarneau (Finistere, France). Three extensive diving surveys undertaken in 1990, 1991 and 1992 show a significant variation of the stock which was estimated at between 700 and 1400 tonnes during this study. The constant level of the annual sea-urchin harvest suggests that these fluctuations may be attributed to variation in recruitment. This can be considered as non-existent in 1989 and 1992, substantial in 1990 and moderate in 1991. The causes of this variability are complex. It is certainly directly related to the phenology of the reproductive cycle (recruitment... |
| Tipo: Text |
Palavras-chave: SPHAERECHINUS-GRANULARIS; ATLANTIC COAST; RECRUITMENT; STOCK. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21138/18758.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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| Bergeron, Jean-pierre. |
| In temperate neritic areas, meteorological conditions prevailing during winter and the following spring play a major role on the main features of the spring development pattern of pelagic ecosystems. Interannual fluctuations of this environment lead to qualitative and quantitative variations of secondary production which may strongly influence processes regulating the recruitment of many species. A method for assessing pelagic secondary production is based on measurement of the activity of an enzyme, aspartate transcarbamylase, and has been carried out during spring periods for six years in succession, in the southwestern part of the English Channel. These works have permitted the establishment of a close correlation between the quantitative variations of... |
| Tipo: Text |
Palavras-chave: ASPARTATE TRANSCARBAMYLASE; ENGLISH CHANNEL; RECRUITMENT; DOVER SOLE; ZOOPLANKTON. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00072/18303/15883.pdf |
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| Gordon, J. C.; Taquet, Marc; Lecchini, D.. |
| This preliminary study explored the capture potential of the Marquesan Islands for fish larvae, especially endemic species, with the set up of light traps on either offshore site or coastal site between January and March 2012. Among the 323 fish larvae belonging to 29 captured species, 151 fish larvae belonging to five species were endemic. Light traps captured more endemic larvae in coastal site than in offshore sites. Overall, this study allows to better understand larval supply of endemic fish species in an isolated region such as the Marquesan Islands. |
| Tipo: Text |
Palavras-chave: LARVAL FISH; MARQUESAN ISLANDS; ENDEMIC SPECIES; RECRUITMENT. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00677/78898/81233.pdf |
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| Brylinski, Jm; Aelbrecht, D. |
| Zooplankton and current studies were carried out in the coastal front of the Dover Strait. We show that the maintenance of both offshore and inshore planktonic communities is due to two coupled phenomena: 1) the residual drift of water differs in the upper and in the deeper waters; and 2) the vertical distribution of plankton differs for inshore and offshore species. In the frontal area, the coastal species remain in the lower water layer where the residual drift is landward. Conversely, the offshore species remain in the upper water layer where the residual drift is seaward. |
| Tipo: Text |
Palavras-chave: ZOOPLANKTON; FRONT; VERTICAL MIGRATION; RECRUITMENT; ENGLISH CHANNEL. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21144/18763.pdf |
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