The genus Pinnularia (Bacillariophyta) on Ile Amsterdam (TAAF, Southern Indian Ocean)

• Main Authors: Van De Vijver, Bart, Chattova, Barbosa, Metzeltin, Ditmar, Lebouvier, Marc
• Other Authors: Department of Bryophyta and Thallophyta - National Botanic Garden of Belgium, National Botanic Garden of Belgium, Department of Botany and Zoology Brno (SCI / MUNI), Faculty of Science Brno (SCI / MUNI), Masaryk University Brno (MUNI)-Masaryk University Brno (MUNI), Ecosystèmes, biodiversité, évolution Rennes (ECOBIO), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Programme IPEV 136 Ecobio
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: Diatoms; Ile Amsterdam; new species; Pinnularia; sub-Antarctica; geo; envir; Antarctic; Indian; Ora; Antarc*; Antarctica
• Online Access: https://hal.archives-ouvertes.fr/hal-00740202

International audience Ile Amsterdam (77° 34′ E, 37° 47′ S), a young, small volcanic island situated in the southern Indian Ocean has a very isolated geographic position and is one of the remotest places in the world. The geographic and physical features of the island have resulted in the presence of a very typical diatom (Bacillariophyta) fl ora dominated by species belonging to the genus Pinnularia. A total of 22 different Pinnularia taxa were observed during a taxonomic analysis of aquatic, moss and soil samples. Twelve taxa did not correspond to any of the currently known species and are described as new species. The new taxa are morphologically and ecologically characterized comparing each of them with all at present known species. The other Pinnularia species are briefl y discussed. A comparison with the other sub-Antarctic islands in the southern Indian Ocean clearly demonstrated the unique fl oristic situation of Ile Amsterdam.