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Low-diversity bacterial microbiota in Southern Ocean representatives of lanternfish genera Electrona, Protomyctophum and Gymnoscopelus (family Myctophidae) ArchiMer
Gallet, Alison; Koubbi, Philippe; Léger, Nelly; Scheifler, Mathilde; Ruiz-rodriguez, Magdalena; Suzuki, Marcelino T.; Desdevises, Yves; Duperron, Sebastien.
Myctophids are among the most abundant mesopelagic teleost fishes worldwide. They are dominant in the Southern Ocean, an extreme environment where they are important both as consumers of zooplankton as well as food items for larger predators. Various studies have investigated myctophids diet, but no data is yet available regarding their associated microbiota, despite that the significance of bacterial communities to fish health and adaptation is increasingly acknowledged. In order to document microbiota in key fish groups from the Southern Ocean, the bacterial communities associated with the gut, fin, gills and light organs of members of six species within the three myctophid genera Electrona, Protomyctophum and Gymnoscopelus were characterized using a 16S...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00598/70973/69202.pdf
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Seasonal dynamics of active SAR11 ecotypes in the oligotrophic Northwest Mediterranean Sea ArchiMer
Salter, Ian; Galand, Pierre E.; Fagervold, Sonja K.; Lebaron, Philippe; Obernosterer, Ingrid; Oliver, Matthew J.; Suzuki, Marcelino T.; Tricoire, Cyrielle.
A seven-year oceanographic time series in NW Mediterranean surface waters was combined with pyrosequencing of ribosomal RNA (16S rRNA) and ribosomal RNA gene copies (16S rDNA) to examine the environmental controls on SAR11 ecotype dynamics and potential activity. SAR11 diversity exhibited pronounced seasonal cycles remarkably similar to total bacterial diversity. The timing of diversity maxima was similar across narrow and broad phylogenetic clades and strongly associated with deep winter mixing. Diversity minima were associated with periods of stratification that were low in nutrients and phytoplankton biomass and characterised by intense phosphate limitation (turnover timeo5 h). We propose a conceptual framework in which physical mixing of the water...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00374/48560/48969.pdf
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