|
|
|
|
|
| Suquet, Marc; Pouvreau, Stephane; Queau, Isabelle; Boulais, Myrina; Le Grand, Jacqueline; Ratiskol, Dominique; Cosson, Jacky. |
| n brooding mollusc species that incubate larvae before their release in seawater, the biology of gametes remains poorly explored. The present study describes some biological characteristics of sperm of the European flat oyster, a native species that has been over-exploited in the past and is nowadays classified as an endangered species in Europe. Flat oysters were collected by divers in the Rade de Brest (Finistère, France), during its natural reproduction period. Gonadal pH is acidic (6.31 ± 0.10). Spermatozoa are clustered in spermatozeugmata, an acellular structure in which the sperm heads are embedded. After their transfer in seawater, spermatozeugmata have a mean diameter of 64 ± 3 μm and they release free spermatozoa for a mean duration of... |
| Tipo: Text |
Palavras-chave: Oyster; Ostrea edulis; Brooding species; Sperm; Spermatozeugmata; Endangered species. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56539/58245.pdf |
| |
|
|
| Weber, Alexandra Anh-thu; Stohr, Sabine; Chenuil, Anne. |
| Cryptic species are numerous in the marine environment. The brittle star Ophioderma longicauda is composed of six mitochondrial lineages, encompassing brooders, which form a monophyletic group, and broadcasters, from which the brooders are derived. To clarify the species limits within O. longicauda, we compared the reproductive status of the sympatric lineages L1 and L3 (defined after sequencing a portion of the mitochondrial gene COI) during the month of May in Greece. In addition, we genotyped a nuclear marker, intron i51. Each L3 female was brooding, whereas all L1 specimens displayed full gonads, suggesting temporal pre-zygotic isolation between brooders and broadcasters. Statistical differences were found among lineages in morphology and bathymetric... |
| Tipo: Text |
Palavras-chave: Ophiuroidea; Espèces cryptiques; Espèce incubante; Sous-unité I de la cytochrome oxydase; EPIC; Ophiuroidea; Cryptic species; Brooding species; Cytochrome oxidase subunit I; EPIC. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00372/48271/48576.pdf |
| |
|
|
| Postaire, Bautisse; Gelin, Pauline; Bruggemann, J. Henrich; Pratlong, Marine; Magalon, Helene. |
| Assessing population connectivity is necessary to construct effective marine protected areas. This connectivity depends, among other parameters, inherently on species dispersal capacities. Isolation by distance (IBD) is one of the main modes of differentiation in marine species, above all in species presenting low dispersal abilities. This study reports the genetic structuring in the tropical hydrozoan Macrorhynchia phoenicea α (sensu Postaire et al., 2016a), a brooding species, from 30 sampling sites in the Western Indian Ocean and the Tropical Southwestern Pacific, using 15 microsatellite loci. At the local scale, genet dispersal relied on asexual propagation at short distance, which was not found at larger scales. Considering one representative per... |
| Tipo: Text |
Palavras-chave: Assignment test; Brooding species; Cryptic diversity; Hydrozoa; Microsatellites. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00399/51011/51795.pdf |
| |
|
|
|
