Geburzi, Jonas, Heuer, Nele, Homberger, Lena, Kabus, Jana, Moesges, Zoe, Ovenbeck, Kira, Brandis, Dirk and Ewers, Christine (2022) An environmental gradient dominates ecological and genetic differentiation of marine invertebrates between the North and Baltic Sea. Ecology and Evolution, 12 (5). e8868. DOI

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Environmental gradients have emerged as important barriers to structuring populations and species distributions. We set out to test whether the strong salinity gradient from the marine North Sea to the brackish Baltic Sea in northern Europe representsan ecological and genetic break, and to identify life history traits that correlate with
the strength of this break. We accumulated mitochondrial cytochrome oxidase sub-unit 1 sequence data, and data on the distribution, salinity tolerance, and life history for 28 species belonging to the Cnidaria, Crustacea, Echinodermata, Mollusca, Polychaeta, and Gastrotricha. We included seven non-native species covering a broad range of times since introduction, in order to gain insight into the pace of adaptation
and differentiation. We calculated measures of genetic diversity and differentiation across the environmental gradient, coalescent times, and migration rates between North and Baltic Sea populations, and analyzed correlations between genetic and life history data. The majority of investigated species is either genetically differentiated
and/or adapted to the lower salinity conditions of the Baltic Sea. Species exhibiting population structure have a range of patterns of genetic diversity in comparison with the North Sea, from lower in the Baltic Sea to higher in the Baltic Sea, or equally di- verse in North and Baltic Sea. Two of the non-native species showed signs of genetic differentiation, their times since introduction to the Baltic Sea being about 80 and >700 years, respectively. Our results indicate that the transition from North Sea to Baltic Sea represents a genetic and ecological break: The diversity of genetic patterns points toward independent trajectories in the Baltic compared with the North Sea, and ecological differences with regard to salinity tolerance are common. The North
Sea–Baltic Sea region provides a unique setting to study evolutionary adaptation during colonization processes at different stages by jointly considering native and non-native species.

Document Type: Article
Programme Area: PA2
Research affiliation: Affiliations > Not ZMT
Ecology > Mangrove Ecology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.:
ISSN: 2045-7758
Date Deposited: 25 Oct 2022 09:25
Last Modified: 17 Nov 2022 08:22

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