Chromosome diversity in Mediterranean and Antarctic euphausiid species (Euphausiacea)
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 1998 |
| Auteurs (3) | : | THIRIOT-QUIEVREUX Catherine LEITAO A CUZIN-ROUDY Jeannine |
| Revue scientifique | : | Journal of Crustacean Biology |
| Volume | : | 18 |
| Fascicule | : | 2 |
| Pages | : | 290-297 |
| DOI | : | 10.2307/1549322 |
| URL | : | <go to isi>://wos:000073607900008 |
| Abstract | : | Chromosome number and morphology were studied in gonadal tissue from eight euphausiid species, using an air-drying technique and Giemsa staining. Among Mediterranean species, haploid chromosome numbers were: n = 19 in Euphausia hemigibba, Euphausia brevis, and Nematoscelis megalops, n = 18 in Euphausia krohni, and n = 11 in Nyctiphanes couchi. Among Antarctic species, haploid chromosome numbers were: n = 17 in Euphausia superba, n = 20 in Thysanoessa macrura, and n = 13 in Thysanoessa vicina. Chromosome morphology was further studied for three species after chromosome measurements: Euphausia hemigibba karyotype showed 17 metacentric and 2 submetacentric chromosome pairs, Euphausia krohni 17 metacentric and 1 submetacentric chromosome pairs, and Nematoscelis megalops 17 metacentric and 2 submetacentric chromosome pairs. Three species sharing the same chromosome number of n = 19, i.e., Euphausia hemigibba, Nematoscelis megalops, and Meganyctiphanes norvegica were distinguished by a different slope of the decrease in chromosome size and by the presence/absence of metacentric and submetacentric chromosome pairs differing in number and position. Chromosome morphology of other species was derived from the observation of meiotic metaphases II. A majority of metacentric chromosomes was also displayed. Cytotaxonomic differences in haploid chromosome number allow the discrimination of morphologically neighboring sympatric species (e.g., Meganyctiphanes norvegica and Nyctiphanes couchi; Thysanoessa vicina and T. macrura). Euphausiids share common chromosomal features which clearly separate them from other eucarids, i.e., a narrow range of haploid chromosome number, a large chromosome size, and a majority of metacentric chromosomes. |
| Mots-clés | : | - |
| Commentaire | : | Times Cited: 4 Leitao, Alexandra/F-8147-2011 4 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Thiriot-Quievreux C, Leitao A, Cuzin-Roudy J (1998) Chromosome diversity in Mediterranean and Antarctic euphausiid species (Euphausiacea). J Crustacean Biol 18: 290-297 | doi: 10.2307/1549322
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