Diversity and dynamics of relevant nanoplanktonic diatoms in the Western English Channel

Arsenieff Laure, Le Gall Florence, Rigaut-Jalabert Fabienne, Mahé Frédéric, Sarno Diana, Gouhier Léna, Baudoux Anne-Claire, Simon Nathalie. 2020. Diversity and dynamics of relevant nanoplanktonic diatoms in the Western English Channel. ISME Journal, 14 (8) : 1966-1981.

https://doi.org/10.1038/s41396-020-0659-6

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Outlier, Sujet : ECOLOGY / Quartile : Outlier, Sujet : MICROBIOLOGY

Résumé : In the ocean, Bacillariophyta are one of the most successful protistan groups. Due to their considerable biogeochemical implications, diatom diversity, development, and seasonality have been at the center of research, specifically large-sized species. In comparison, nanoplanktonic diatoms are mostly disregarded from routine monitoring and are often underrepresented in genetic reference databases. Here, we identified and investigated the temporal dynamics of relevant nanodiatoms occurring in the Western English Channel (SOMLIT-Astan station). Coupling in situ and laboratory approaches, we revealed that nano-species from the genera Minidiscus and Thalassiosira are key components of the phytoplankton community that thrive in these coastal waters, but they display different seasonal patterns. Some species formed recurrent blooms whilst others were persistent year round. These results raise questions about their regulation in the natural environment. Over a full seasonal cycle at the monitoring station, we succeeded in isolating viruses which infect these minute diatoms, suggesting that these mortality agents may contribute to their control. Overall, our study points out the importance of considering nanodiatom communities within time-series surveys to further understand their role and fate in marine systems.

Mots-clés Agrovoc : Bacillariophyceae, écologie microbienne, micro-organisme, biologie moléculaire, relation hôte pathogène

Mots-clés géographiques Agrovoc : Bretagne, France

Mots-clés libres : Microbial communities, Microbial ecology, Molecular ecology, Virus–host interactions

Classification Agris : M40 - Écologie aquatique

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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