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  • 1
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    Genetic structure of Baltic Mytilus populations (2017)
    PANGAEA
    In:  Supplement to: Stuckas, Heiko; Knöbel, Loreen; Schade, Hanna; Breusing, Corinna; Hinrichsen, Hans-Harald; Bartel, Anja; Langguth, Klaudia; Melzner, Frank (2017): Combining hydrodynamic modelling with genetics: Can passive larval drift shape the genetic structure of Baltic Mytilus populations? Molecular Ecology, https://doi.org/10.1111/mec.14075
    Details
    Publication Date: 2023-01-13
    Description: While secondary contact between Mytilus edulis and M. trossulus in North America results in mosaic hybrid zone formation, both species form a hybrid swarm in the Baltic. Despite pervasive gene flow, Baltic Mytilus species maintain substantial genetic and phenotypic differentiation. Exploring mechanisms underlying the contrasting genetic composition in Baltic Mytilus species will allow insights into processes such as speciation or adaptation to extremely low salinity. Previous studies in the Baltic indicated that only weak interspecific reproductive barriers exist and discussed the putative role of adaptation to environmental conditions. Using a combination of hydrodynamic modelling and multilocus genotyping we investigate how oceanographic conditions influence passive larval dispersal and hybrid swarm formation in the Baltic. By combining our analyses with previous knowledge we show a genetic transition of Baltic Mytilus species along longitude 12°-13°E, i.e. a virtual line between Malmö (Sweden) and Stralsund (Germany). Although larval transport only occurs over short distances (10-30 km), limited larval dispersal could not explain the position of this genetic transition zone. Instead, the genetic transition zone is located at the area of maximum salinity change (15 to 10 psu). Thus, we argue that selection results in weak reproductive barriers and local adaptation. This scenario could maintain genetic and phenotypic differences between Baltic Mytilus species despite pervasive introgressive hybridization.
    Keywords: AHP; AHS; AKO; Allele; BAR; Code; Date/Time of event; DIVER; ECK; ESH; Event label; FLB; FSD; GEO; GLT; GRO; GWZ; HEL; HLG; HON; Identification; KAP; LATITUDE; Location; LONGITUDE; MAH; Mussels_Aarhus; Mussels_Ahrenshoop; Mussels_Askoe; Mussels_Barhoeft; Mussels_Dranske; Mussels_Eckernfoerde; Mussels_Fehmarnsund; Mussels_Flensburg; Mussels_Gelting; Mussels_Gollwitz; Mussels_Groemitz; Mussels_Hel; Mussels_Helgoland; Mussels_Kappeln; Mussels_KielFjord_Eastshore; Mussels_KielFjord_GEOMAR; Mussels_KielFjord_Hoern; Mussels_KielFjord_ShipMuseum; Mussels_Maasholm; Mussels_PennCove; Mussels_Steinbeck; Mussels_Tjaernoe; Mussels_Usedom; Mussels_Warnemuende; Mussels_Wendtorf; PCO; RUD; Sample code/label; Sampling by diver; SMU; STB; TJ; USE; WMU; WNF
    Type: Dataset
    Format: text/tab-separated-values, 6267 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Allele shift under laboratory selection and local adaptation to low salinity in Baltic Sea mytilid mussels (2018)
    PANGAEA
    Details
    Publication Date: 2023-02-06
    Description: Baltic blue mussels colonise and dominate benthic habitats with much lower salinity than any other marine mytilid population globally. Surprisingly, all Baltic populations are hybrids of Mytilus edulis x M. trossulus genotypes with the former dominating hybrid genotypes in the western (high salinity) and the latter in the eastern part of the Baltic (low salinity). Here, we tested if low salinity selects for M. trossulus dominated hybrid genotypes and whether populations along the salinity gradient are locally adapted to their specific salinity regimes. Using laboratory larval rearing trials, we can show that Baltic M. trossulus hybrids have higher fitness when exposed to salinities 〈10 psu whereas Baltic M. edulis hybrids have higher fitness at a salinity of 16 psu. In addition, we can demonstrate that populations from the centre of the hybrid cline can be selected towards Baltic M. trossulus hybrids at low salinities, with allele shifts significantly beyond genetic drift expectations. We conclude that salinity driven selection can shape mussel populations and hence allows for local adaptation to extremely low environmental salinity. Future climate change driven desalination therefore has the potential to shift the Baltic Sea hybrid gradient to the west, with important implications for ecology and aquaculture.
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 67.6 kBytes
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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