Volume 13, Issue 1 e9729
RESEARCH ARTICLE
Open Access

Limited population genetic variation but pronounced seascape genetic structuring in populations of the Mediterranean mussel (Mytilus galloprovincialis) from the eastern Adriatic Sea

Joanna S. Hamilton

Corresponding Author

Joanna S. Hamilton

School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand

Correspondence

Joanna S. Hamilton, School of Biological Sciences, Victoria University of Wellington, Wellington 6140, New Zealand.

Email: [email protected]

Contribution: Conceptualization (equal), Data curation (lead), Formal analysis (equal), Funding acquisition (equal), ​Investigation (equal), Methodology (equal), Resources (supporting), Software (equal), Validation (equal), Visualization (equal), Writing - original draft (equal), Writing - review & editing (lead)

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Marina Piria

Marina Piria

Department of Fisheries, Apiculture, Faculty of Agriculture, Wildlife Management and Special Zoology, University of Zagreb, Zagreb, Croatia

Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland

Contribution: Conceptualization (equal), Funding acquisition (equal), Methodology (equal), Project administration (supporting), Resources (lead), Writing - review & editing (supporting)

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Ana Gavrilović

Ana Gavrilović

Department of Fisheries, Apiculture, Faculty of Agriculture, Wildlife Management and Special Zoology, University of Zagreb, Zagreb, Croatia

Contribution: Resources (supporting), Writing - review & editing (supporting)

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Mirna Mrkonjić Fuka

Mirna Mrkonjić Fuka

Department of Microbiology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia

Contribution: Resources (supporting), Writing - review & editing (supporting)

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Lidija Svečnjak

Lidija Svečnjak

Department of Fisheries, Apiculture, Faculty of Agriculture, Wildlife Management and Special Zoology, University of Zagreb, Zagreb, Croatia

Contribution: Resources (supporting), Writing - review & editing (supporting)

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Slađana Nikolić

Slađana Nikolić

Institute of Marine Biology, University of Montenegro, Kotor, Montenegro

Contribution: Resources (supporting), Writing - review & editing (supporting)

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Rigers Bakiu

Rigers Bakiu

Department of Aquaculture and Fisheries, Faculty of Agriculture and Environment, Agricultural University of Tirana, Tirana, Albania

Albanian Center for Environmental Protection and Sustainable Development, Tirana, Albania

Contribution: Resources (supporting), Writing - review & editing (supporting)

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Jonathan P. A. Gardner

Jonathan P. A. Gardner

School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand

Contribution: Conceptualization (equal), Formal analysis (equal), Funding acquisition (equal), ​Investigation (equal), Methodology (equal), Project administration (lead), Resources (lead), Software (equal), Supervision (lead), Validation (equal), Visualization (equal), Writing - original draft (equal), Writing - review & editing (lead)

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First published: 24 January 2023
Citations: 1

Abstract

Population genetic analysis of variation at five neutral microsatellite loci for Mediterranean mussels (Mytilus galloprovincialis) from 18 sites along the eastern Adriatic Sea revealed little or no spatial variation. In contrast, seascape genetics analysis revealed a pronounced locus-specific gradient in allelic and genotypic frequencies across the study region. At a sixth locus, MGE7, the frequencies of two alleles, MGE7243 and MGE7249, were strongly associated, negatively and positively, respectively, with a single environmental variable – minimum salinity (minSAL). The frequency of the MGE7243/243 homozygous genotype was strongly negatively associated with minSAL, whereas the frequencies of the MGE7246/249 and the MGE7249/249 genotypes were strongly positively correlated with minSAL. Interpretation of these pronounced gradients is confounded by the fact that minSAL and another environmental variable, maximum sea surface temperature (maxSST), are highly correlated (R = −.911) and are therefore not necessarily acting independently. BLAST searches of the MGE7 locus against M. galloprovincialis whole genome shotgun sequence returned an alignment with contig mg10_S01094 (accession UYJE01010330.1) and 7 predicted M. galloprovincialis proteins VDI82194.1 - VDI82200.1. Conserved domain searches revealed a similar structure to the transcriptional regulator Msx2-interacting protein. The BLASTp search also returned significant alignments to Msx2-interacting proteins in Mytilus coruscus, Crassostrea virginica, and Haliotis rubra. The existence of the MGE7 gradient highlights the role that environmental variation may play in retarding gene flow among wild M. galloprovincialis populations, and also how the success of collection of young mussels (spat) from one site and their transfer to another site (the farm) may be influenced by a single factor such as minSAL or maxSST on a localized scale.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are openly available in Dryad at [https://doi.org/10.5061/dryad.p8cz8w9t8].

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.