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| Jolly, Mt; Jollivet, D; Gentil, F; Thiebaut, E; Viard, F. |
| This study uses enzymatic and mitochondrial genes to infer the relative importance of historical processes and contemporary hydrodynamic features on the observed patterns of genetic structure in subdivided populations of Pectinaria koreni (Polychaeta: Pectinariidae) along the coasts of Brittany and the English Channel. Nucleotide sequence variation of a 603-bp fragment of the mtDNA cytochrome oxidase subunit I gene revealed a surprisingly deep phylogeographic break of about 16% divergence separating the Brittany and Channel populations, which coincides with a biogeographic boundary along the western coast of Brittany. Deep sequence divergence with fixed haplotype differences and the inversion of allele frequencies at two enzyme loci suggests the occurrence... |
| Tipo: Text |
Palavras-chave: Phylogeography; Allozymes; MtDNA; Parapatric boundary; Cryptic species. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00301/41250/40433.pdf |
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| Dauvin, J; Ruellet, T; Thiebaut, E; Gentil, F; Desroy, Nicolas; Janson, A; Duhamel, S; Jourde, J; Simon, S. |
| Since late 1990s the annelid polychaete Melinna palmata and the mollusc bivalve Ensis directus have been collected in the eastern part of the Bay of Seine (English Channel), indicating changes in the benthic communities. Melinna palmata was never collected prior to 2002, whereas it was reported in the muddy fine sands of the western part of the Channel, along the French (e.g. Bay of Cherbourg) and southern UK (e.g. Southampton Waters) coasts. Ensis directus was first reported in 1998 and now appears to be well implanted, given the abundant population collected in 2006. The colonization of Melina palmata seems to be a consequence of recent increase of the fine sediment in the eastern part of the Bay, while that of the invasive Ensis directus seems more... |
| Tipo: Text |
Palavras-chave: Invasive species; Environmental disturbances; New records; Range expansion; English Channel; Bay of Seine; Ensis directus; Melinna palmata. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3567.pdf |
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| Cabioch, L.; Gentil, F. |
| Le benthos, c'est-à-dire les espèces (végétales et animales) inféodées aux fonds marins, constitue un indicateur écologique fidèle puisqu'il intègre, sur place, toutes les conditions affectant son environnement. En effet, la somme des facteurs écologiques existant en un point quelconque du fond, détermine les possibilités d'existence des espèces et leur regroupement en unités de peuplements, schématiquement, on retiendra pour la description de ces associations les principaux facteurs que sont l'hydrologie, l'hydrodynamisme et la sédimentologie dont les caractères généraux pour la Baie de Seine ont déjà été donnés précédemment. Nous présenterons donc directement les peuplements benthiques animaux de la Baie de Seine en liaison avec leurs conditions... |
| Tipo: Text |
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| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/00105/21628/19208.pdf |
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