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  • 1
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    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
    Publication Date: 2018-12-15
    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.
    Type: Dataset
    Format: text/tab-separated-values, 6267 data points
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  • 2
    Publication Date: 2019-04-30
    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/octet-stream, 67.0 kBytes
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  • 3
    Publication Date: 2019-02-01
    Description: While secondary contact between Mytilus edulis and Mytilus 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, that is 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 (15–10 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.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Publication Date: 2019-08-20
    Description: Mytilus mussels (Mytilus edulis (ME), M. trossulus (MT), and M. galloprovincialis (MG)) are of interest in many fields of marine science and have been used as model in evolutionary research. For instance, they form mosaic hybrid zones or hybrid swarms in areas of secondary contact and hence are suited to address questions related to the evolution of reproductive barriers, adaptive hybridization or speciation. While existing genomic information mostly focuses on single species (ME, MG), this project generated RNA seq data of all three species from allopatric populations, i.e. samples representing genetically pure specimens. We investigated adult mantle tissue (four specimens per species), which is functionally involved in processes such as reproduction or biomineralization. The project provides three assembled transcriptomes (post filtering total transcript numbers for ME: 353339, MT: 437827, MG: 290267) representing genes annotated to at least 40 level 2 GO-terms (number (percentage) of annotated transcripts for ME: 44434 (12.6%), MT: 43960 (10%), MG: 60064 (20.7%)). Annotation showed that the most abundant 40 GO-terms are equally well covered by contigs of the three Mytilus transcriptomes. Therefore, this project lays a basis for evolutionary research by providing candidate genes representing various molecular functions such as reproduction, cellular processes or immune response. The potential of the new transcriptomes to address evolutionary questions is further exemplified by a pilot study on ME and MT transcriptomes that used reciprocal blast to identify 7652 one-to-one orthologue pairs of transcripts
    Type: Article , PeerReviewed
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