Publications des scientifiques de l'IRD

Mattio Lydiane, Payri Claude, Stiger-Pouvreau V. (2008). Taxonomic revison of Sargassum (Fucales, Phaeophyceae) from French Polynesia based on morphological and molecular analyses. Journal of Phycology, 44 (6), p. 1541-1555. ISSN 0022-3646.

Titre du document
Taxonomic revison of Sargassum (Fucales, Phaeophyceae) from French Polynesia based on morphological and molecular analyses
Année de publication
2008
Type de document
Article référencé dans le Web of Science WOS:000261334200020
Auteurs
Mattio Lydiane, Payri Claude, Stiger-Pouvreau V.
Source
Journal of Phycology, 2008, 44 (6), p. 1541-1555 ISSN 0022-3646
An assessment of Sargassum in French Polynesia was done through the critical revision of the literature, type specimens, and specimens from type localities. Sargassum samples were newly collected, and four morphotypes were identified on the basis of morphological characters. Molecular analysis of the nuclear ITS2, chloroplastic partial rbcLS, and mitochondrial cox3 markers generated two clades and confirmed the recent divergence suspected between closely related species. Although 18 different epithets have been attributed to French Polynesian Sargassum since 1828, only three species are considered valid in this study. Most of these species were transferred to S. pacificum Bory, the only species present in the Society Archipelago, while S. obtusifolium J. Agardh was restricted to the Austral Archipelago, and S. echinocarpum J. Agardh was confirmed for the Austral and Gambier Archipelagos. A morphological identification key is provided, along with descriptions and illustrations for each polymorphic species. Moreover, the study of several regional collections underlined similar and low specific diversity among Sargassum populations in the southeastern Pacific. As a result of this study, we propose that S. bacciferum J. Agardh var. latiuscula Grunow, S. bisserula f. pacifica Grunow, S. boraborense (Grunow) Setch., S. mangarevense (Grunow) Setch., S. sociale (Grunow) Setch., and S. tahitense Grunow be considered as heterotypic synonyms of S. pacificum. Sargassum skottsbergii Sjostedt, S. hawaiiensis Doty et Newhouse, S. divaricatum var. chilensis Grunow, S. obtusifolium J. Agardh f. chamberlainii Grunow, and S. obtusifolium J. Agardh f. lendigeroides Grunow are further regarded as heterotypic synonyms of S. obtusifolium.
Plan de classement
Sciences du monde végétal [076]
Localisation
Fonds IRD [F B010044164]
Identifiant IRD
fdi:010044164
Contact