Bacterial Community Composition in the Sea Surface Microlayer Off the Peruvian Coast.

Zäncker, Birthe, Cunliffe, Michael and Engel, Anja (2018) Bacterial Community Composition in the Sea Surface Microlayer Off the Peruvian Coast. Open Access Frontiers in Microbiology, 9 . Art.Nr. 2699. DOI 10.3389/fmicb.2018.02699.

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Supplementary data:

Abstract

The sea surface microlayer (SML) is located at the air-sea interface, with microorganisms and organic matter in the SML influencing air-sea exchange processes. Yet understanding of the SML bacterial (bacterioneuston) community composition and assembly remains limited. Availability of organic matter, UV radiation and wind speed have previously been suggested to influence the community composition of bacterioneuston. Another mechanism potentially controlling bacterioneuston dynamics is bacterioplankton attached to gel-like particles that ascend through the water column into the SML. We analyzed the bacterial community composition, Transparent Exopolymer Particles (TEP) abundance and nutrient concentrations in the surface waters of the Peruvian upwelling region. The bacterioneuston and bacterioplankton communities were similar, suggesting a close spatial coupling. Four Bacteroidetes families were significantly enriched in the SML, two of them, the Flavobacteriaceae and Cryomorphaceae, were found to comprise the majority of SML-enriched operational taxonomic units (OTUs). The enrichment of these families was controlled by a variety of environmental factors. The SML-enriched bacterial families were negatively correlated with water temperature and wind speed in the SML and positively correlated with nutrient concentrations, salinity and TEP in the underlying water (ULW). The correlations with nutrient concentrations and salinity suggest that the enriched bacterial families were more abundant at the upwelling stations.

Document Type: Article
Keywords: microbial ecology, sea surface microlayer, SML, bacteria, cruise SO243, RV Sonne, peruvian upwelling region, transparent exopolymer particles
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3389/fmicb.2018.02699
ISSN: 1664-302X
Projects: EMBO, SOPRAN
Expeditions/Models/Experiments:
Date Deposited: 16 Nov 2018 14:13
Last Modified: 24 May 2019 07:37
URI: http://oceanrep.geomar.de/id/eprint/44666

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