1. Cyanobacteria phylogenetic studies reveal evidence for polyphyletic genera from thermal and freshwater habitats
- Author
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Rúben Luz, Rita Cordeiro, Vitor Vasconcelos, Vítor Gonçalves, Amélia Fonseca, and Centro Interdisciplinar de Investigação Marinha e Ambiental
- Subjects
0106 biological sciences ,Biodiversity ,Biology ,01 natural sciences ,thermal ,03 medical and health sciences ,Freshwater ,Polyphyletic genera ,Phylogenetics ,Cyanophyceae ,Thermal ,Polyphyly ,Oceanic islands ,14. Life underwater ,16S rRNA ,freshwater ,lcsh:QH301-705.5 ,Chroococcales ,Azores ,030304 developmental biology ,Nature and Landscape Conservation ,Nostocales ,0303 health sciences ,Synechococcales ,Ecology ,010604 marine biology & hydrobiology ,Ecological Modeling ,oceanic islands ,15. Life on land ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,polyphyletic genera ,lcsh:Biology (General) ,Taxonomy (biology) ,Oscillatoriales - Abstract
Cyanobacteria are among the most diverse morphological microorganisms that inhabit a great variety of habitats. Their presence in the Azores, a volcanic archipelago of nine islands in the middle of the North Atlantic Ocean, has already been reported. However, due to the high diversity of cyanobacteria habitats, their biodiversity is still understudied, mainly in extreme environments. To address this, a total of 156 cyanobacteria strains from Azores lakes, streams, thermal and terrestrial habitats were isolated. Identification was made based on a polyphasic approach using classical taxonomy (morphological characteristics and environmental data) and phylogeny among 81 strains assessed by maximum likelihood and Bayesian analysis of 16S rDNA partial sequences. The 156 isolates showed a high genera diversity (38) belonging to the orders Chroococcales, Nostocales, Oscillatoriales, and Synechococcales. Eleven new genera for the Azores habitats are here reported, reinforcing that cyanobacteria biodiversity in these islands is still much understudied. Phylogenetic analysis showed 14 clusters associated with these cyanobacteria orders, with evidence for six new genera and valuable information towards Microchaete/Coleospermum taxonomic revision that better reflects species environmental distribution. These results emphasize the need for cyanobacteria taxonomy revisions, through polyphasic studies, mainly in Synechococcales order and in the Microchaete/Coleospermum, Nostoc, and Anabaena genera. Rita Cordeiro was supported by a Ph.D. grant (M3.1.a/F/017/2015) from the Fundo Regional da Ciência e Tecnologia (FRCT). This work was funded by FEDER funds through the Interreg-MAC 2014-2020 Program under the projects REBECA - Red de excelencia en biotecnología azul (algas) de la región macaronesia (MAC1.1a/060) and REBECA-CCT - Red de Excelencia en Biotecnología Azul de la Región Macaronésica. Consolidación, Certificación y Transferencia (MAC2/1.1b/269), and by Portuguese National Funds, through FCT - Fundação para a Ciência e a Tecnologia, the European Union, QREN, FEDER, COMPETE, by funding the CIBIO/InBIO (project UID/BIA/ 50027/2013 and POCI-01-0145-FEDER-006821).
- Published
- 2020