Terrestrial dissolved organic matter inflow drives temporal dynamics of the bacterial community of a subarctic estuary (northern Baltic Sea).

Autor: Figueroa D; Department of Ecology and Environmental Science, Umeå University, Umeå, SE-901 87, Sweden.; Umeå Marine Sciences Centre, Hörnefors, SE-905 71, Sweden., Capo E; Department of Ecology and Environmental Science, Umeå University, Umeå, SE-901 87, Sweden., Lindh MV; Ecology and Evolution in Microbial Model Systems, EEMiS, Linnaeus University, Kalmar, SE-391 82, Sweden., Rowe OF; Baltic Marine Environment Protection Commission HELCOM, Helsinki, FI-00160, Finland., Paczkowska J; Department of Ecology and Environmental Science, Umeå University, Umeå, SE-901 87, Sweden.; Umeå Marine Sciences Centre, Hörnefors, SE-905 71, Sweden., Pinhassi J; Ecology and Evolution in Microbial Model Systems, EEMiS, Linnaeus University, Kalmar, SE-391 82, Sweden., Andersson A; Department of Ecology and Environmental Science, Umeå University, Umeå, SE-901 87, Sweden.; Umeå Marine Sciences Centre, Hörnefors, SE-905 71, Sweden.
Jazyk: angličtina
Zdroj: Environmental microbiology [Environ Microbiol] 2021 Aug; Vol. 23 (8), pp. 4200-4213. Date of Electronic Publication: 2021 Jun 01.
DOI: 10.1111/1462-2920.15597
Abstrakt: Climate change is projected to cause increased inflow of terrestrial dissolved organic matter to coastal areas in northerly regions. Estuarine bacterial community will thereby receive larger loads of organic matter and inorganic nutrients available for microbial metabolism. The composition of the bacterial community and its ecological functions may thus be affected. We studied the responses of bacterial community to inflow of terrestrial dissolved organic matter in a subarctic estuary in the northern Baltic Sea, using a 16S rRNA gene metabarcoding approach. Betaproteobacteria dominated during the spring river flush, constituting ~ 60% of the bacterial community. Bacterial diversity increased as the runoff decreased during summer, when Verrucomicrobia, Betaproteobacteria, Bacteroidetes, Gammaproteobacteria and Planctomycetes dominated the community. Network analysis revealed that a larger number of associations between bacterial populations occurred during the summer than in spring. Betaproteobacteria and Bacteroidetes populations appeared to display similar correlations to environmental factors. In spring, freshly discharged organic matter favoured specialists, while in summer a mix of autochthonous and terrestrial organic matter promoted the development of generalists. Our study indicates that increased inflows of terrestrial organic matter-loaded freshwater to coastal areas would promote specialist bacteria, which in turn might enhance the transformation of terrestrial organic matter in estuarine environments.
(© 2021 The Authors. Environmental Microbiology published by Society for Applied Microbiology and John Wiley & Sons Ltd.)
Databáze: MEDLINE
Externí odkaz: