{"entity": "researcher", "timestamp": "2026-08-14T12:55:03.363Z", "family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "affiliations": ["Tj\u00e4rn\u00f6 Marine Laboratory, Department of Marine Sciences University of Gothenburg Str\u00f6mstad Sweden."], "links": {"self": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}, "display": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc"}}, "publications": [{"entity": "publication", "iuid": "db0102f308044e068375eaab4e78dc48", "links": {"self": {"href": "https://publications.scilifelab.se/publication/db0102f308044e068375eaab4e78dc48.json"}, "display": {"href": "https://publications.scilifelab.se/publication/db0102f308044e068375eaab4e78dc48"}}, "title": "An Evolutionary Mosaic Challenges Traditional Monitoring of a Foundation Species in a Coastal Environment-The Baltic Fucus vesiculosus.", "authors": [{"family": "Pereyra", "given": "Ricardo T", "initials": "RT"}, {"family": "Kinnby", "given": "Alexandra", "initials": "A"}, {"family": "Le Moan", "given": "Alan", "initials": "A", "orcid": "0000-0002-9124-6844", "researcher": {"href": "https://publications.scilifelab.se/researcher/609a745ce1fb42fea85cc8d55db25acf.json"}}, {"family": "Ortega-Martinez", "given": "Olga", "initials": "O"}, {"family": "Jonsson", "given": "Per R", "initials": "PR"}, {"family": "Piarulli", "given": "Stefania", "initials": "S"}, {"family": "Pinder", "given": "Matthew I M", "initials": "MIM", "orcid": "0000-0003-4407-0214", "researcher": {"href": "https://publications.scilifelab.se/researcher/ca6d9f52178249f3995c3d276fbc2728.json"}}, {"family": "T\u00f6pel", "given": "Mats", "initials": "M"}, {"family": "De Wit", "given": "Pierre", "initials": "P", "orcid": "0000-0003-4709-3438", "researcher": {"href": "https://publications.scilifelab.se/researcher/95b69d4724ce4b69819c0a1578cd56eb.json"}}, {"family": "Andr\u00e9", "given": "Carl", "initials": "C"}, {"family": "Knutsen", "given": "Halvor", "initials": "H", "orcid": "0000-0002-7627-7634", "researcher": {"href": "https://publications.scilifelab.se/researcher/a822f994fed046018a713105bc5e03a0.json"}}, {"family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "researcher": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}}], "type": "journal article", "published": "2025-02-17", "journal": {"title": "Mol. Ecol.", "issn": "1365-294X", "pages": "e17699", "issn-l": "0962-1083"}, "abstract": "During periods of environmental change, genetic diversity in foundation species is critical for ecosystem function and resilience, but it remains overlooked in environmental monitoring. In the Baltic Sea, a key species for monitoring is the brown seaweed Fucus vesiculosus, which forms sublittoral 3D habitats providing shelter and food for fish and invertebrates. Ecological distribution models predict a significant loss of Baltic F. vesiculosus due to ocean warming, unless populations can adapt. Genetic variation and recombination during sexual reproduction are essential for adaptation, but studies have revealed large-scale clonal reproduction within the Baltic Sea. We analysed genome-wide single nucleotide polymorphism (SNP) data from the east Atlantic, the \"Transition zone,\" and the Baltic Sea, and found a mosaic of divergent lineages in the Baltic Sea, contrasting an outside dominance of a few genetic groups. We determined that the previously described endemic species Fucus radicans is predominantly a large female clone of F. vesiculosus in its northern Baltic distribution. In the two Estonian sites, however, individuals earlier referred to as F. radicans are sexually and reproductively isolated from Baltic F. vesiculosus, revealing a separate lineage that may have diverged long before the formation of the Baltic Sea. Monitoring Baltic Fucus without considering this genetic complexity will fail to prioritise populations with adaptive potential to new climate conditions. From our genomic data, we can extract informative and diagnostic genetic markers that differentiate major genetic entities. Such a SNP panel will provide a straightforward tool for spatial and temporal monitoring and informing management decisions and actions.", "doi": "10.1111/mec.17699", "pmid": "39957665", "labels": {"National Genomics Infrastructure": "Service", "NGI Short read": "Service", "NGI Uppsala (SNP&SEQ Technology Platform)": "Service"}, "xrefs": [], "notes": [], "created": "2025-11-07T07:26:56.214Z", "modified": "2025-11-07T07:26:56.376Z"}, {"entity": "publication", "iuid": "e2ea7c02a3da445f8d79556975eaaf52", "links": {"self": {"href": "https://publications.scilifelab.se/publication/e2ea7c02a3da445f8d79556975eaaf52.json"}, "display": {"href": "https://publications.scilifelab.se/publication/e2ea7c02a3da445f8d79556975eaaf52"}}, "title": "Coupling of twelve putative chromosomal inversions maintains a strong barrier to gene flow between snail ecotypes.", "authors": [{"family": "Le Moan", "given": "Alan", "initials": "A", "orcid": "0000-0002-9124-6844", "researcher": {"href": "https://publications.scilifelab.se/researcher/609a745ce1fb42fea85cc8d55db25acf.json"}}, {"family": "Stankowski", "given": "Sean", "initials": "S", "orcid": "0000-0003-0472-9299", "researcher": {"href": "https://publications.scilifelab.se/researcher/62d9805534164f3ea59cd97a3ad89435.json"}}, {"family": "Rafajlovi\u0107", "given": "Marina", "initials": "M", "orcid": "0000-0003-2177-4622", "researcher": {"href": "https://publications.scilifelab.se/researcher/c19ea9bb89f644e897e85f38a6341684.json"}}, {"family": "Ortega-Martinez", "given": "Olga", "initials": "O", "orcid": "0000-0003-2734-6434", "researcher": {"href": "https://publications.scilifelab.se/researcher/bc84f54ca2cc49bc869cd23adeffc7ac.json"}}, {"family": "Faria", "given": "Rui", "initials": "R", "orcid": "0000-0001-6635-685X", "researcher": {"href": "https://publications.scilifelab.se/researcher/4dbdd2fff57949148124073f004f74c2.json"}}, {"family": "Butlin", "given": "Roger K", "initials": "RK", "orcid": "0000-0003-4736-0954", "researcher": {"href": "https://publications.scilifelab.se/researcher/e510a963ebeb4e8c8af68b10a001a326.json"}}, {"family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "researcher": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}}], "type": "journal article", "published": "2024-08-00", "journal": {"title": "Evolution Letters", "issn": "2056-3744", "volume": "8", "issue": "4", "pages": "575-586", "issn-l": "2056-3744"}, "abstract": "Chromosomal rearrangements can lead to the coupling of reproductive barriers, but whether and how they contribute to the completion of speciation remains unclear. Marine snails of the genus Littorina repeatedly form hybrid zones between populations segregating for multiple inversion arrangements, providing opportunities to study their barrier effects. Here, we analyzed 2 adjacent transects across hybrid zones between 2 ecotypes of Littorina fabalis (\"large\" and \"dwarf\") adapted to different wave exposure conditions on a Swedish island. Applying whole-genome sequencing, we found 12 putative inversions on 9 of 17 chromosomes. Nine of the putative inversions reached near differential fixation between the 2 ecotypes, and all were in strong linkage disequilibrium. These inversions cover 20% of the genome and carry 93% of divergent single nucleotide polymorphisms (SNPs). Bimodal hybrid zones in both transects indicated that the 2 ecotypes of Littorina fabalis maintain their genetic and phenotypic integrity following contact. The bimodality reflects the strong coupling between inversion clines and the extension of the barrier effect across the whole genome. Demographic inference suggests that coupling arose during a period of allopatry and has been maintained for > 1,000 generations after secondary contact. Overall, this study shows that the coupling of multiple chromosomal inversions contributes to strong reproductive isolation. Notably, 2 of the putative inversions overlap with inverted genomic regions associated with ecotype differences in a closely related species (Littorina saxatilis), suggesting the same regions, with similar structural variants, repeatedly contribute to ecotype evolution in distinct species.", "doi": "10.1093/evlett/qrae014", "pmid": "39479507", "labels": {"Bioinformatics Support for Computational Resources": "Service"}, "xrefs": [{"db": "pmc", "key": "PMC11523631"}, {"db": "pii", "key": "qrae014"}], "notes": [], "created": "2024-11-25T10:23:07.835Z", "modified": "2025-02-28T14:17:31.399Z"}, {"entity": "publication", "iuid": "eb2054fcd72f4e85a7d459c134350840", "links": {"self": {"href": "https://publications.scilifelab.se/publication/eb2054fcd72f4e85a7d459c134350840.json"}, "display": {"href": "https://publications.scilifelab.se/publication/eb2054fcd72f4e85a7d459c134350840"}}, "title": "Clones on the run: The genomics of a recently expanded partially clonal species.", "authors": [{"family": "Pereyra", "given": "Ricardo T", "initials": "RT"}, {"family": "Rafajlovi\u0107", "given": "Marina", "initials": "M"}, {"family": "De Wit", "given": "Pierre", "initials": "P", "orcid": "0000-0003-4709-3438", "researcher": {"href": "https://publications.scilifelab.se/researcher/95b69d4724ce4b69819c0a1578cd56eb.json"}}, {"family": "Pinder", "given": "Matthew", "initials": "M"}, {"family": "Kinnby", "given": "Alexandra", "initials": "A"}, {"family": "T\u00f6pel", "given": "Mats", "initials": "M"}, {"family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "researcher": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}}], "type": "journal article", "published": "2023-08-00", "journal": {"title": "Mol. Ecol.", "issn": "1365-294X", "volume": "32", "issue": "15", "pages": "4209-4223", "issn-l": "0962-1083"}, "abstract": "Why species that in their core areas mainly reproduce sexually become enriched with clones in marginal populations (\"geographic parthenogenesis\") remains unclear. Earlier hypotheses have emphasized that selection might promote clonality because it protects locally adapted genotypes. On the other hand, it also hampers recombination and adaptation to changing conditions. The aim of the present study was to investigate the early stages of range expansion in a partially clonal species and what drives an increase in cloning during such expansion. We used genome-wide sequencing to investigate the origin and evolution of large clones formed in a macroalgal species (Fucus vesiculosus) during a recent expansion into the postglacial Baltic Sea. We found low but persistent clonality in core populations, while at range margins, large dominant clonal lineages had evolved repeatedly from different sexual populations. A range expansion model showed that even when asexual recruitment is less favourable than sexual recruitment in core populations, repeated bottlenecks at the expansion front can establish a genetically eroded clonal wave that spreads ahead of a sexual wave into the new area. Genetic variation decreases by drift following repeated bottlenecks at the expansion front. This results in the emerging clones having low expected heterozygosity, which corroborated our empirical observations. We conclude that Baker's Law (clones being favoured by uniparental reproductive assurance in new areas) can play an important role during range expansion in partially clonal species, resulting in a complex spatiotemporal mosaic of clonal and sexual lineages that might persist during thousands of generations.", "doi": "10.1111/mec.16996", "pmid": "37199478", "labels": {"NGI Short read": "Service", "NGI Uppsala (SNP&SEQ Technology Platform)": "Service", "National Genomics Infrastructure": "Service"}, "xrefs": [], "notes": [], "created": "2023-11-29T09:04:27.425Z", "modified": "2023-11-29T09:04:27.440Z"}, {"entity": "publication", "iuid": "2909595198df4c9abdf042b88b8acb93", "links": {"self": {"href": "https://publications.scilifelab.se/publication/2909595198df4c9abdf042b88b8acb93.json"}, "display": {"href": "https://publications.scilifelab.se/publication/2909595198df4c9abdf042b88b8acb93"}}, "title": "Ten years of marine evolutionary biology-Challenges and achievements of a multidisciplinary research initiative.", "authors": [{"family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "researcher": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}}, {"family": "Leder", "given": "Erica H", "initials": "EH"}, {"family": "Andr\u00e9", "given": "Carl", "initials": "C"}, {"family": "Dupont", "given": "Sam", "initials": "S", "orcid": "0000-0002-9148-6565", "researcher": {"href": "https://publications.scilifelab.se/researcher/f2a083981f504ce3ac1d0629d663238b.json"}}, {"family": "Eriksson", "given": "Susanne P", "initials": "SP"}, {"family": "Harding", "given": "Karin", "initials": "K"}, {"family": "Havenhand", "given": "Jonathan N", "initials": "JN"}, {"family": "Jahnke", "given": "Marlene", "initials": "M"}, {"family": "Jonsson", "given": "Per R", "initials": "PR"}, {"family": "Kvarnemo", "given": "Charlotta", "initials": "C", "orcid": "0000-0001-8983-2900", "researcher": {"href": "https://publications.scilifelab.se/researcher/914d1337967942d8a3790e47e5b5d86b.json"}}, {"family": "Pavia", "given": "Henrik", "initials": "H"}, {"family": "Rafajlovi\u0107", "given": "Marina", "initials": "M", "orcid": "0000-0003-2177-4622", "researcher": {"href": "https://publications.scilifelab.se/researcher/c19ea9bb89f644e897e85f38a6341684.json"}}, {"family": "R\u00f6dstr\u00f6m", "given": "Eva Marie", "initials": "EM"}, {"family": "Thorndyke", "given": "Michael", "initials": "M"}, {"family": "Blomberg", "given": "Anders", "initials": "A"}], "type": "journal article", "published": "2023-02-00", "journal": {"title": "Evol Appl", "issn": "1752-4571", "issn-l": "1752-4571", "volume": "16", "issue": "2", "pages": "530-541"}, "abstract": "The Centre for Marine Evolutionary Biology (CeMEB) at the University of Gothenburg, Sweden, was established in 2008 through a 10-year research grant of 8.7 m\u20ac to a team of senior researchers. Today, CeMEB members have contributed >500 scientific publications, 30 PhD theses and have organised 75 meetings and courses, including 18 three-day meetings and four conferences. What are the footprints of CeMEB, and how will the centre continue to play a national and international role as an important node of marine evolutionary research? In this perspective article, we first look back over the 10 years of CeMEB activities and briefly survey some of the many achievements of CeMEB. We furthermore compare the initial goals, as formulated in the grant application, with what has been achieved, and discuss challenges and milestones along the way. Finally, we bring forward some general lessons that can be learnt from a research funding of this type, and we also look ahead, discussing how CeMEB's achievements and lessons can be used as a springboard to the future of marine evolutionary biology.", "doi": "10.1111/eva.13389", "pmid": "36793681", "labels": {"NGI Stockholm (Genomics Production)": "Service", "National Genomics Infrastructure": "Service", "NGI Short read": "Service"}, "xrefs": [{"db": "pmc", "key": "PMC9923476"}, {"db": "pii", "key": "EVA13389"}], "notes": [], "created": "2023-03-06T13:47:40.061Z", "modified": "2023-03-06T14:14:21.192Z"}, {"entity": "publication", "iuid": "2ee8b678c1cc4b938cd6947cc5231c97", "links": {"self": {"href": "https://publications.scilifelab.se/publication/2ee8b678c1cc4b938cd6947cc5231c97.json"}, "display": {"href": "https://publications.scilifelab.se/publication/2ee8b678c1cc4b938cd6947cc5231c97"}}, "title": "An allozyme polymorphism is associated with a large chromosomal inversion in the marine snail Littorina fabalis.", "authors": [{"family": "Le Moan", "given": "Alan", "initials": "A", "orcid": "0000-0002-9124-6844", "researcher": {"href": "https://publications.scilifelab.se/researcher/609a745ce1fb42fea85cc8d55db25acf.json"}}, {"family": "Panova", "given": "Marina", "initials": "M", "orcid": "0000-0002-4147-6473", "researcher": {"href": "https://publications.scilifelab.se/researcher/d2398a3ba7fb4cd2b25968f7760b267b.json"}}, {"family": "De Jode", "given": "Aur\u00e9lien", "initials": "A", "orcid": "0000-0003-0428-439X", "researcher": {"href": "https://publications.scilifelab.se/researcher/b1ff392d2a03435795aa8a8a1ee8dd65.json"}}, {"family": "Ortega-Martinez", "given": "Olga", "initials": "O"}, {"family": "Duvetorp", "given": "M\u00e5rten", "initials": "M"}, {"family": "Faria", "given": "Rui", "initials": "R", "orcid": "0000-0001-6635-685X", "researcher": {"href": "https://publications.scilifelab.se/researcher/4dbdd2fff57949148124073f004f74c2.json"}}, {"family": "Butlin", "given": "Roger", "initials": "R", "orcid": "0000-0003-4736-0954", "researcher": {"href": "https://publications.scilifelab.se/researcher/e510a963ebeb4e8c8af68b10a001a326.json"}}, {"family": "Johannesson", "given": "Kerstin", "initials": "K", "orcid": "0000-0003-0176-7986", "researcher": {"href": "https://publications.scilifelab.se/researcher/a376951d80cd405183f4ff8606df8bbc.json"}}], "type": "journal article", "published": "2023-02-00", "journal": {"title": "Evol Appl", "issn": "1752-4571", "volume": "16", "issue": "2", "pages": "279-292", "issn-l": "1752-4571"}, "abstract": "Understanding the genetic targets of natural selection is one of the most challenging goals of population genetics. Some of the earliest candidate genes were identified from associations between allozyme allele frequencies and environmental variation. One such example is the clinal polymorphism in the arginine kinase (Ak) gene in the marine snail Littorina fabalis. While other enzyme loci do not show differences in allozyme frequencies among populations, the Ak alleles are near differential fixation across repeated wave exposure gradients in Europe. Here, we use this case to illustrate how a new sequencing toolbox can be employed to characterize the genomic architecture associated with historical candidate genes. We found that the Ak alleles differ by nine nonsynonymous substitutions, which perfectly explain the different migration patterns of the allozymes during electrophoresis. Moreover, by exploring the genomic context of the Ak gene, we found that the three main Ak alleles are located on different arrangements of a putative chromosomal inversion that reaches near fixation at the opposing ends of two transects covering a wave exposure gradient. This shows Ak is part of a large (3/4 of the chromosome) genomic block of differentiation, in which Ak is unlikely to be the only target of divergent selection. Nevertheless, the nonsynonymous substitutions among Ak alleles and the complete association of one allele with one inversion arrangement suggest that the Ak gene is a strong candidate to contribute to the adaptive significance of the inversion.", "doi": "10.1111/eva.13427", "pmid": "36793696", "labels": {"National Genomics Infrastructure": "Service", "NGI Short read": "Service", "NGI Stockholm (Genomics Production)": "Service", "Bioinformatics Support for Computational Resources": "Service"}, "xrefs": [{"db": "pmc", "key": "PMC9923470"}, {"db": "pii", "key": "EVA13427"}], "notes": [], "created": "2023-10-04T12:04:49.853Z", "modified": "2024-01-16T13:48:34.062Z"}]}