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Salinity drives meiofaunal community structure dynamics across the Baltic ecosystem
Stockholm University.ORCID iD: 0000-0001-9005-5168
Stockholm University.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science. Södertörn University, Centre for Baltic and East European Studies (CBEES), Baltic & East European Graduate School (BEEGS).
Stockholm University.
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2019 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 28, no 16, p. 3813-3829Article in journal (Refereed) Published
Abstract [en]

Coastal benthic biodiversity is under increased pressure from climate change, eutrophication, hypoxia, and changes in salinity due to increase in river runoff. The Baltic Sea is a large brackish system characterized by steep environmental gradients that experiences all of the mentioned stressors. As such it provides an ideal model system for studying the impact of on-going and future climate change on biodiversity and function of benthic ecosystems. Meiofauna (animals < 1 mm) are abundant in sediment and are still largely unexplored even though they are known to regulate organic matter degradation and nutrient cycling. In this study, benthic meiofaunal community structure was analysed along a salinity gradient in the Baltic Sea proper using high-throughput sequencing. Our results demonstrate that areas with higher salinity have a higher biodiversity, and salinity is likely the main driver influencing meiofauna diversity and community composition. Furthermore, in the more diverse and saline environments a larger amount of nematode genera classified as predators prevailed, and meiofauna-macrofauna associations were more prominent. These findings show that in the Baltic Sea, a decrease in salinity resulting from accelerated climate change will likely lead to decreased benthic biodiversity, and cause profound changes in benthic communities, with potential consequences for ecosystem stability, functions and services.

Place, publisher, year, edition, pages
Blackwell Publishing, 2019. Vol. 28, no 16, p. 3813-3829
National Category
Environmental Sciences
Research subject
Environmental Studies; Baltic and East European studies
Identifiers
URN: urn:nbn:se:sh:diva-38682DOI: 10.1111/mec.15179ISI: 000486595200001PubMedID: 31332853Scopus ID: 2-s2.0-85071870438OAI: oai:DiVA.org:sh-38682DiVA, id: diva2:1340709
Funder
Swedish Research Council Formas, 2016-00804Science for Life Laboratory - a national resource center for high-throughput molecular bioscienceKnut and Alice Wallenberg FoundationSwedish Research CouncilSwedish Agency for Marine and Water ManagementAvailable from: 2019-08-06 Created: 2019-08-06 Last updated: 2019-10-10Bibliographically approved

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Sommer, Christian

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