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Stuckas, Heiko; Knöbel, Loreen; Schade, Hanna; Breusing, Corinna; Hinrichsen, Hans-Harald; Bartel, Manuela; Langguth, Klaudia; Melzner, Frank (2017): Genetic structure of Baltic Mytilus populations. PANGAEA,, 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,

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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.
Median Latitude: 54.518842 * Median Longitude: 5.773898 * South-bound Latitude: 48.210000 * West-bound Longitude: -122.700000 * North-bound Latitude: 58.880000 * East-bound Longitude: 18.800000
Date/Time Start: 2003-10-01T00:00:00 * Date/Time End: 2013-11-01T00:00:00
Mussels_Aarhus (AHS) * Latitude: 56.160000 * Longitude: 10.210000 * Date/Time: 2005-07-01T00:00:00 * Method/Device: Sampling by diver (DIVER)
Mussels_Ahrenshoop (AHP) * Latitude: 54.380000 * Longitude: 12.410000 * Date/Time: 2013-09-01T00:00:00 * Method/Device: Sampling by diver (DIVER)
Mussels_Askoe (AKO) * Latitude: 58.820000 * Longitude: 17.640000 * Date/Time: 2004-06-01T00:00:00 * Method/Device: Sampling by diver (DIVER)
Raw allele data for 5 nuclear and one mitochondrial marker underlying analysis of hybrid status of Baltic mytilid mussels.
ME = Mytilus edulis
MT = Mytilus trossulus
MG = Mytilus galloprovincialis
100=ME-allele, 200=MT-allele, 300=MG-allele
FE = M. edulis F genome; FL = M.edulis F genome length variant
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventMelzner, Frank
2LocationLocationMelzner, Frank
3CodeCodeMelzner, Frank
4LATITUDELatitudeMelzner, FrankGeocode
5LONGITUDELongitudeMelzner, FrankGeocode
6Date/Time of eventDate/TimeMelzner, Frank
7Sample code/labelSample labelMelzner, Frank
8AlleleAllelebpMelzner, Franknuclear locus: mac, allele 1
9AlleleAllelebpMelzner, Franknuclear locus: mac, allele 2
10AlleleAllelebpMelzner, Franknuclear locus: Glu5, allele 1
11AlleleAllelebpMelzner, Franknuclear locus: Glu5, allele 1
12AlleleAllelebpMelzner, Franknuclear locus: Efbis, allele 1
13AlleleAllelebpMelzner, Franknuclear locus: Efbis, allele 2
14AlleleAllelebpMelzner, Franknuclear locus: MAL, allele 1
15AlleleAllelebpMelzner, Franknuclear locus: MAL, allele 2
16AlleleAllelebpMelzner, Franknuclear locus: M7Lysin, allele 1
17AlleleAllelebpMelzner, Franknuclear locus: M7Lysin, allele 2
18IdentificationIDMelzner, FrankmtDNA: D-Loop
6267 data points

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