Increasing oxygen deficiency changes rare and moderately abundant bacterial communities in coastal soft sediments

Show full item record



Permalink

http://hdl.handle.net/10138/306956

Citation

Sinkko , H , Hepolehto , I , Lyra , C , Rinta-Kanto , J M , Villnäs , A , Norkko , J , Norkko , A & Timonen , S 2019 , ' Increasing oxygen deficiency changes rare and moderately abundant bacterial communities in coastal soft sediments ' , Scientific Reports , vol. 9 , no. 1 , 16341 . https://doi.org/10.1038/s41598-019-51432-1

Title: Increasing oxygen deficiency changes rare and moderately abundant bacterial communities in coastal soft sediments
Author: Sinkko, Hanna; Hepolehto, Iina; Lyra, Christina; Rinta-Kanto, Johanna M.; Villnäs, Anna; Norkko, Joanna; Norkko, Alf; Timonen, Sari
Other contributor: University of Helsinki, Department of Bacteriology and Immunology
University of Helsinki, Department of Microbiology
University of Helsinki, Department of Microbiology
University of Helsinki, Department of Microbiology
University of Helsinki, Biological stations
University of Helsinki, Biological stations
University of Helsinki, Biological stations
University of Helsinki, Department of Microbiology








Date: 2019-11-08
Language: eng
Number of pages: 14
Belongs to series: Scientific Reports
ISSN: 2045-2322
DOI: https://doi.org/10.1038/s41598-019-51432-1
URI: http://hdl.handle.net/10138/306956
Abstract: Coastal hypoxia is a major environmental problem worldwide. Hypoxia-induced changes in sediment bacterial communities harm marine ecosystems and alter biogeochemical cycles. Nevertheless, the resistance of sediment bacterial communities to hypoxic stress is unknown. We investigated changes in bacterial communities during hypoxic-anoxic disturbance by artificially inducing oxygen deficiency to the seafloor for 0, 3, 7, and 48 days, with subsequent molecular biological analyses. We further investigated relationships between bacterial communities, benthic macrofauna and nutrient effluxes across the sediment-water-interface during hypoxic-anoxic stress, considering differentially abundant operational taxonomic units (OTUs). The composition of the moderately abundant OTUs changed significantly after seven days of oxygen deficiency, while the abundant and rare OTUs first changed after 48 days. High bacterial diversity maintained the resistance of the communities during oxygen deficiency until it dropped after 48 days, likely due to anoxia-induced loss of macrofaunal diversity and bioturbation. Nutrient fluxes, especially ammonium, correlated positively with the moderate and rare OTUs, including potential sulfate reducers. Correlations may reflect bacteria-mediated nutrient effluxes that accelerate eutrophication. The study suggests that even slightly higher bottom-water oxygen concentrations, which could sustain macrofaunal bioturbation, enable bacterial communities to resist large compositional changes and decrease the harmful consequences of hypoxia in marine ecosystems.
Subject: 1183 Plant biology, microbiology, virology
FRAGMENT-LENGTH-POLYMORPHISMS
SP NOV.
DISSIMILATORY FE(III)
MICROBIAL COMMUNITY
MARINE-SEDIMENTS
GEN. NOV.
ORGANIC-MATTER
BALTIC SEA
HYPOXIA
DIVERSITY
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
s41598_019_51432_1.pdf 2.561Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record