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Effects of wastewater treatment plant effluent inputs on planktonic metabolic rates and microbial community composition in the Baltic Sea
Univ Balearic Isl, Spain.
Tech Univ Denmark, Denmark.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Ctr Ecol & Evolut Microbial Model Syst, EEMiS)ORCID iD: 0000-0002-6550-1565
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Hawaii Manoa, USA. (Ctr Ecol & Evolut Microbial Model Syst, EEMiS)ORCID iD: 0000-0002-7120-4145
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2016 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 13, no 16, 4751-4765 p.Article in journal (Refereed) Published
Abstract [en]

The Baltic Sea is the world's largest area suffering from eutrophication-driven hypoxia. Low oxygen levels are threatening its biodiversity and ecosystem functioning. The main causes for eutrophication-driven hypoxia are high nutrient loadings and global warming. Wastewater treatment plants (WWTP) contribute to eutrophication as they are important sources of nitrogen to coastal areas. Here, we evaluated the effects of wastewater treatment plant effluent inputs on Baltic Sea planktonic communities in four experiments. We tested for effects of effluent inputs on chlorophyll a content, bacterial community composition, and metabolic rates: gross primary production (GPP), net community production (NCP), community respiration (CR) and bacterial production (BP). Nitrogen-rich dissolved organic matter (DOM) inputs from effluents increased bacterial production and decreased primary production and community respiration. Nutrient amendments and seasonally variable environmental conditions lead to lower alpha-diversity and shifts in bacterial community composition (e.g. increased abundance of a few cyanobacterial populations in the summer experiment), concomitant with changes in metabolic rates. An increase in BP and decrease in CR could be caused by high lability of the DOM that can support secondary bacterial production, without an increase in respiration. Increases in bacterial production and simultaneous decreases of primary production lead to more carbon being consumed in the microbial loop, and may shift the ecosystem towards heterotrophy.

Place, publisher, year, edition, pages
2016. Vol. 13, no 16, 4751-4765 p.
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-57461DOI: 10.5194/bg-13-4751-2016ISI: 000383799000003OAI: oai:DiVA.org:lnu-57461DiVA: diva2:1039880
Available from: 2016-10-25 Created: 2016-10-19 Last updated: 2016-10-25Bibliographically approved

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Muthusamy, Sarala DeviLindh, Markus V.Pinhassi, Jarone
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
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  • Other locale
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