Biogeographical and seasonal dynamics of the marine Roseobacter community and ecological links to DMSP-producing phytoplankton.

Autor: O'Brien J; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia. james.obrien@student.uts.edu.au.; School of Life Sciences, University of Technology Sydney, Broadway, NSW, Australia. james.obrien@student.uts.edu.au., McParland EL; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA., Bramucci AR; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia., Siboni N; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia., Ostrowski M; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia., Kahlke T; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia., Levine NM; Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA., Brown MV; School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW, Australia., van de Kamp J; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia., Bodrossy L; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia., Messer LF; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia.; Centre for Microbiome Research, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia., Petrou K; School of Life Sciences, University of Technology Sydney, Broadway, NSW, Australia., Seymour JR; Climate Change Cluster, University of Technology Sydney, Broadway, NSW, Australia. justin.seymour@uts.edu.au.
Jazyk: angličtina
Zdroj: ISME communications [ISME Commun] 2022 Feb 14; Vol. 2 (1), pp. 16. Date of Electronic Publication: 2022 Feb 14.
DOI: 10.1038/s43705-022-00099-3
Abstrakt: Ecological interactions between marine bacteria and phytoplankton play a pivotal role in governing the ocean's major biogeochemical cycles. Among these, members of the marine Roseobacter Group (MRG) can establish mutualistic relationships with phytoplankton that are, in part, maintained by exchanges of the organosulfur compound, dimethylsulfoniopropionate (DMSP). Yet most of what is known about these interactions has been derived from culture-based laboratory studies. To investigate temporal and spatial co-occurrence patterns between members of the MRG and DMSP-producing phytoplankton we analysed 16S and 18S rRNA gene amplicon sequence variants (ASVs) derived from 5 years of monthly samples from seven environmentally distinct Australian oceanographic time-series. The MRG and DMSP-producer communities often displayed contemporaneous seasonality, which was greater in subtropical and temperate environments compared to tropical environments. The relative abundance of both groups varied latitudinally, displaying a poleward increase, peaking (MRG at 33% of total bacteria, DMSP producers at 42% of eukaryotic phototrophs) during recurrent spring-summer phytoplankton blooms in the most temperate site (Maria Island, Tasmania). Network analysis identified 20,140 significant positive correlations between MRG ASVs and DMSP producers and revealed that MRGs exhibit significantly stronger correlations to high DMSP producers relative to other DMSP-degrading bacteria (Pelagibacter, SAR86 and Actinobacteria). By utilising the power of a continental network of oceanographic time-series, this study provides in situ confirmation of interactions found in laboratory studies and demonstrates that the ecological dynamics of an important group of marine bacteria are shaped by the production of an abundant and biogeochemically significant organosulfur compound.
(© 2022. The Author(s).)
Databáze: MEDLINE
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