Impact of protist grazing on a key bacterial group for biogeochemical cycling in Baltic Sea pelagic oxic/anoxic interfaces.
作者： Ruth Anderson , Claudia Wylezich , Sabine Glaubitz , Matthias Labrenz , Klaus Jürgens
关键词: Chrysophyta 、 Epsilonproteobacteria 、 Anoxic waters 、 Biogeochemical cycle 、 Population 、 Pelagic zone 、 Biology 、 Bacterivore 、 Sulfurimonas 、 Ecology
摘要: Summary Barrier zones between oxic and anoxic water masses (redoxclines) host highly active prokaryotic communities with important roles in biogeochemical cycling. In Baltic Sea pelagic redoxclines, Epsilonproteobacteria of the genus Sulfurimonas (subgroup GD17) have been shown to dominate chemoautotrophic denitrification. However, little is known on loss processes affecting this group. present study, protist grazing impact subgroup GD17 was determined for suboxic oxygen/hydrogen sulphide interface depths using predator exclusion assays bacterial amendment cultured representative ‘Sulfurimonas gotlandica’ strain GD1. Additionally, principal bacterivores were identified by RNA-Stable Isotope Probing (RNA-SIP). The natural population grew strongly under conditions (doubling time: 1–1.5 days), but could consume complete new cell production per day. samples, or no growth observed. RNA-SIP five grazers, belonging typical redoxcline ciliates (Oligohymenophorea, Prostomatea) globally widespread marine flagellate groups (MAST-4, Chrysophyta, Cercozoa). Overall, we demonstrate first time that can control growth, potentially vertical distribution, a chemolithoautotrophic key-player oxic/anoxic interfaces.
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