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Metamorphosis of Pectin Aria Koreni (Annelida: Polychaeta) and Recruitment of an Isolated Population in the English Channel

Published online by Cambridge University Press:  11 May 2009

R. Lambert
Affiliation:
Muséum National d'Histoire Naturelle, Laboratoire Maritime de Dinard, 17 Avenue George V, BP 28, 35401 Dinard, France.
C. Retière
Affiliation:
Muséum National d'Histoire Naturelle, Laboratoire Maritime de Dinard, 17 Avenue George V, BP 28, 35401 Dinard, France.
Y. Lagadeuc*
Affiliation:
Station Marine, URA-CNRS 1363, BP 80, 62930 Wimereux, France.
*
Address for correspondence

Extract

In the Bay of Seine (English Channel) the polychaete Pectinaria koreni exhibits interannual stability in its abundance, despite its isolated distribution and its bentho-planktonic life cycle. To test the hypothesis of a high level of recruitment related to high survival rate of the post-larvae due to metamorphosis in the water column (transformation of metatrochophore into aulophore), we undertook a study of the morphology and the dynamics of the aulophore stage during May and June 1987. The morphological study snowed that aulophore larvae do not possess all the morphological features needed for benthic life on their first contact with the substratum. Fifteen days are needed to complete this development, and during this time the mortality rate is high. The possible role of this delayed metamorphosis on the transport of aulophore larvae towards sites favourable to adults is also discussed.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1996

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