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Multi biomarker analysis of pollution effect on resident populations of blue mussels from the Baltic Sea
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
University of Gdańsk, Gdynia, Poland.
University of Gdańsk, Gdynia, Poland.
University of Gdańsk, Gdynia, Poland.
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2018 (English)In: Aquatic Toxicology, ISSN 0166-445X, E-ISSN 1879-1514, Vol. 198, p. 240-256Article in journal (Refereed) Published
Abstract [en]

Anthropogenic pollution including metals, petroleum, toxins, nutrients and many others is a growing problem in the marine environment. These are important factors altering the environment and by that the fate of many local populations of marine organisms. The aim of this study was to assess the impact of selected point pollution sources on resident populations of the blue mussel (Mytilus edulis trossulus) in the Baltic Sea using multiple biomarker approach. The study used a nested sampling scheme in which sites from reference (REF) habitats are geographically paired with selected sites from sewage treatment plants (STP) and harbors (HAR). The results showed that mussels from harbors had a higher frequency of histological abnormalities in the digestive gland compared to mussels from sewage effluent affected areas and reference sites. However these mussels together with mussels from STPs had higher lipid content, body mass index (BMI) and gonado-somatic index (GSI) compared to mussels from reference sites. A marked spatial variability was found with a stronger toxicity of ambient environment affecting resident mussel populations in the Gulf of Gdańsk area, while an opposite pattern was found in Tvärminne area. Yet the blue mussels sampled in the Gulf of Gdańsk were characterized by the highest GSI and BMI values compared to Askö and Tvärminne populations. No differences in analyzed biomarker response related to species identity, measured by a species-specific genetic marker, were found indicative of strong genetic introgression in the Baltic Proper.

Place, publisher, year, edition, pages
2018. Vol. 198, p. 240-256
Keywords [en]
Baltic Sea; blue mussel; pollution; physiology; histopathological lesions
National Category
Environmental Sciences
Research subject
Environmental Studies; Baltic and East European studies
Identifiers
URN: urn:nbn:se:sh:diva-33701DOI: 10.1016/j.aquatox.2018.02.024ISI: 000430630100025PubMedID: 29558709Scopus ID: 2-s2.0-85044104103OAI: oai:DiVA.org:sh-33701DiVA, id: diva2:1157307
Funder
The Foundation for Baltic and East European Studies, A063-10
Note

As manuscript in dissertation.

Available from: 2017-11-15 Created: 2017-11-15 Last updated: 2018-05-16Bibliographically 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. p. 71
Series
Södertörn Doctoral Dissertations, ISSN 1652-7399 ; 148
Keywords
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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