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Use of organic exudates from two polar diatoms by bacterial isolates from the Arctic Ocean

2020; Royal Society; Volume: 378; Issue: 2181 Linguagem: Inglês

10.1098/rsta.2019.0356

1471-2962

Lucas Tisserand, Laëtitia Dadaglio, Laurent Intertaglia, Philippe Catala, Christos Panagiotopoulos, Ingrid Obernosterer, Fabien Joux,

Diatoms and Algae Research

Global warming affects primary producers in the Arctic, with potential consequences for the bacterial community composition through the consumption of microalgae-derived dissolved organic matter (DOM). To determine the degree of specificity in the use of an exudate by bacterial taxa, we used simple microalgae-bacteria model systems. We isolated 92 bacterial strains from the sea ice bottom and the water column in spring-summer in the Baffin Bay (Arctic Ocean). The isolates were grouped into 42 species belonging to Proteobacteria, Bacteroidetes, Actinobacteria and Firmicutes. Forty strains were tested for their capacity to grow on the exudate from two Arctic diatoms