Heterotrophic Bacteria Enhance the Aggregation of the Marine Picocyanobacteria and .

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ID: 29161
2019
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Ranked #187 of 201 articles by views in Frontiers in microbiology

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Abstract
Marine picocyanobacteria are ubiquitous primary producers across the world's oceans, and play a key role in the global carbon cycle. Recent evidence stemming from investigations have shown that picocyanobacteria are able to sink out of the euphotic zone to depth, which has traditionally been associated with larger, mineral ballasted cells. The mechanisms behind the sinking of picocyanobacteria remain a point of contention, given that they are too small to sink on their own. To gain a mechanistic understanding of the potential role of picocyanobacteria in carbon export, we tested their ability to form "suspended" (5-60 μm) and "visible" (ca. > 0.1 mm) aggregates, as well as their production of transparent exopolymer particles (TEP)-which are a key component in the formation of marine aggregates. Additionally, we investigated if interactions with heterotrophic bacteria play a role in TEP production and aggregation in and by comparing xenic and axenic cultures. We observed TEP production and aggregation in batch cultures of axenic , but not in axenic . Heterotrophic bacteria enhanced TEP production as well as suspended and visible aggregate formation in , while in , aggregation was enhanced with no changes in TEP. Aggregation experiments using a natural plankton community dominated by picocyanobacteria resulted in aggregation only in the presence of the ballasting mineral kaolinite, and only when were in their highest seasonal abundance. Our results point to a different export potential between the two picocyanobacteria, which may be mediated by interactions with heterotrophic bacteria and presence of ballasting minerals. Further studies are needed to clarify the mechanistic role of bacteria in TEP production and aggregation of these picocyanobacteria.
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cruz2019heterotrophicfrontiers Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Cruz, Bianca N;Neuer, Susanne;
Journal Frontiers in microbiology
Year 2019
DOI
10.3389/fmicb.2019.01864
URL
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