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Sewage treatment plant associated genetic differentiation in the blue mussel from the Baltic Sea and Swedish west coast
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Biology.ORCID iD: 0000-0002-5013-6462
SLU.
University of Gdansk, Gdynia , Poland.
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2016 (English)In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 4, e2628Article in journal (Refereed) Published
Abstract [en]

Human-derived environmental pollutants and nutrients that reach the aquatic environment through sewage effluents, agricultural and industrial processes are constantly contributing to environmental changes that serve as drivers for adaptive responses and evolutionary changes in many taxa. In this study, we examined how two types of point sources of aquatic environmental pollution, harbors and sewage treatment plants, affect gene diversity and genetic differentiation in the blue mussel in the Baltic Sea area and off the Swedish west coast (Skagerrak). Reference sites (REF) were geographically paired with sites from sewage treatments plant (STP) and harbors (HAR) with a nested sampling scheme, and genetic differentiation was evaluated using a high-resolution marker amplified fragment length polymorphism (AFLP). This study showed that genetic composition in the Baltic Sea blue mussel was associated with exposure to sewage treatment plant effluents. In addition, mussel populations from harbors were genetically divergent, in contrast to the sewage treatment plant populations, suggesting that there is an effect of pollution from harbors but that the direction is divergent and site specific, while the pollution effect from sewage treatment plants on the genetic composition of blue mussel populations acts in the same direction in the investigated sites.

Place, publisher, year, edition, pages
2016. Vol. 4, e2628
National Category
Biological Sciences Environmental Sciences
Research subject
Baltic and East European studies
Identifiers
URN: urn:nbn:se:sh:diva-31135DOI: 10.7717/peerj.2628ISI: 000387168200015PubMedID: 27812424Scopus ID: 2-s2.0-84994409132OAI: oai:DiVA.org:sh-31135DiVA: diva2:1045939
Funder
The Foundation for Baltic and East European Studies, A063-10
Available from: 2016-11-11 Created: 2016-11-11 Last updated: 2017-11-29Bibliographically approved
In thesis
1. Genetic Aspects of Environmental Disturbances in Marine Ecosystems: Studies of the Blue Mussel in the Baltic Sea
Open this publication in new window or tab >>Genetic Aspects of Environmental Disturbances in Marine Ecosystems: Studies of the Blue Mussel in the Baltic Sea
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Anthropogenic environmental changes can serve as drivers for evolutionary responses in wild populations. To predict the long-term impact of anthropogenic changes on populations, it is crucial to understand the genetic effects caused by these disturbances. The Baltic Sea is considered to be one of the world’s most contaminated seas, and the increase of anthropogenic chemical pollution is a major threat to its ecosystems. This thesis assesses the impact of harbors and sewage treatment plants on physiological traits and genetic structure of resident populations of blue mussels at replicated sites in the Baltic Sea. The initial evaluation of the overall genetic pattern in blue mussel populations in the Swedish West Coast, the Baltic Proper and the Bothnian Sea found genetic differentiation between the three water basins and a low genetic differentiation within each basin, especially within the Baltic Proper. Despite the low genetic differentiation among blue mussels within the Baltic Proper, a parallel genetic differentiation associated with sewage treatment plant effluents was found in this basin. This included genomic regions with a high degree of differentiation between reference sites and sites affected by sewage plants effluent. This genetic differentiation is suggested to be due to post-dispersal selection acting in each generation. In contrast, no parallel genetic differentiation was associated with harbors. We identified five genomic regions in blue mussels, showing strong signs of selection, shared among three out of four replicated reference sites and sites affected by sewage effluents in the Baltic Proper i.e. Askö, Tvärminne and Karlskrona. An initial characterization of these genomic regions revealed functions related to immune and endocrine responses, oxidative stress and shell formation. Our results indicate that selection caused by sewage effluents involves multiple loci. The same genomic regions are found across different locations in the Baltic Proper but there are also unique genomic regions at each location. No genotoxic or histopathological effects were found among blue mussels from sewage effluent-affected areas but a higher frequency of histological abnormalities in the digestive gland were observed in mussels from harbors.

Place, publisher, year, edition, pages
Huddinge: Södertörns högskola, 2017. 71 p.
Series
Södertörn Doctoral Dissertations, ISSN 1652-7399 ; 148
Keyword
Blue mussel, Baltic Sea, anthropogenic disturbance, pollution, sewage effluents, harbors, genetics, genomics
National Category
Biological Sciences
Research subject
Environmental Studies; Baltic and East European studies
Identifiers
urn:nbn:se:sh:diva-33697 (URN)1328/42/2010 (Local ID)978-91-88663-23-8 (ISBN)978-91-88663-24-5 (ISBN)1328/42/2010 (Archive number)1328/42/2010 (OAI)
Public defence
2017-12-15, MA636, Alfred Nobels allé 7, Huddinge, 10:00 (English)
Opponent
Supervisors
Projects
Evolutionära anpassningar till miljöstörningar i marina ekosystem: genetisk ekotoxikologi i Östersjön
Funder
The Foundation for Baltic and East European Studies, A063-10
Available from: 2017-11-23 Created: 2017-11-14 Last updated: 2017-12-27Bibliographically approved

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Larsson, JosefineLönn, MikaelGrahn, Mats

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