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• W2553472932 abstract "Abstract. We investigated the possibility of bacterial symbiosis in Globigerina bulloides, a palaeoceanographically important, planktonic foraminifer. This marine protist is commonly used in investigations of climatically sensitive subpolar and temperate water masses and wind driven upwelling regions of the world’s oceans. G. bulloides is unusual because it lacks the protist algal symbionts that are often found in other spinose species and has an atypical geochemical shell signature. This is suggestive of a divergent ecology, making it a good candidate for investigating the potential for bacterial symbiosis as a contributory factor in shell calcification. Such ecological information is essential to evaluate fully the potential response of G. bulloides to ocean acidification and climate change. To investigate the ecological interactions between G. bulloides and bacterial populations in the water column, 18S rRNA gene sequencing, fluorescence microscopy, 16S rRNA gene metabarcoding and transmission electron microscopy (TEM) were performed on individual specimens of G. bulloides (Type IId) collected from two locations in the California Current. Intracellular DNA extracted from five G. bulloides specimens was subjected to 16S rRNA gene metabarcoding and, remarkably, 37–87 % of all 16S rRNA gene sequences recovered were assigned to operational taxonomic units (OTUs) of the picocyanobacterium, Synechococcus. This finding was supported by TEM observations of intact Synechococcus cells in both the cytoplasm and vacuoles of G. bulloides. Concentrations were up to four orders of magnitude greater inside the foraminifera than those reported for the Californian Current water column and approximately 5 % of the intracellular Synechococcus cells observed were dividing. This suggests that Synechococcus is an endobiont of G. bulloides Type IId, which is the first report of a bacterial endobiont in the planktonic foraminifera. We consider the potential roles of Synechococcus and G. bulloides within the relationship and the need to determine how widespread the possible symbiotic association is within the widely distributed G. bulloides morphospecies. The possible influence of Synechococcus respiration on G. bulloides shell geochemistry is also discussed." @default.
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• W2553472932 date "2016-11-16" @default.
• W2553472932 modified "2023-09-27" @default.
• W2553472932 title "16S rRNA gene metabarcoding reveals a potential metabolic role for intracellular bacteria in a major marine planktonic calcifier (Foraminifera)" @default.
• W2553472932 doi "https://doi.org/10.5194/bg-2016-406" @default.
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