Complex patterns of secondary spread without loss of genetic diversity in invasive populations of the Asian shore crab H
- PDF / 1,690,008 Bytes
- 18 Pages / 595.276 x 790.866 pts Page_size
- 41 Downloads / 183 Views
ORIGINAL PAPER
Complex patterns of secondary spread without loss of genetic diversity in invasive populations of the Asian shore crab Hemigrapsus takanoi (Decapoda) along European coasts Jonas C. Geburzi1,2,3,4 · Christine Ewers‑Saucedo2 · Dirk Brandis2 · Günther B. Hartl1 Received: 28 August 2019 / Accepted: 14 October 2020 © The Author(s) 2020
Abstract Genetic studies of introduced non-native species are a valuable tool to investigate invasion history and pathways, source populations and multiple introductions of alien species, as well as evolutionary genetic changes following establishment in a new environment. We used a set of nine polymorphic microsatellites to analyse the population genetic structure of the introduced Asian shore crab Hemigrapsus takanoi along European coasts. Our dataset covered the complete known European range of the species, including the most recent records from Great Britain and the southwestern Baltic Sea. The results showed a similarly high genetic diversity of H. takanoi throughout Europe, and no indication of genetic bottlenecks during secondary spread, even in the most recently established populations. Analyses for population structure along geographic regions gave support for a separation between the Bay of Seine populations (northern France) and all other populations. Genetic differentiation within the North and Baltic Seas was more subtle and patchy, hinting to potential unrecognised introduction events, dispersal barriers and anthropogenic vector activity. The populations from the Baltic Sea and Great Britain clustered with the Wadden Sea populations, suggesting secondary introductions from the southeastern North Sea as likely invasion pathways. In summary, we suggest that a combination of anthropogenic secondary spread and the species’ reproductive biology have prevented a loss of genetic diversity during its ongoing expansion. We argue that genetic data depicting population status shortly after an introduction event—like the British and Baltic Sea populations of H. takanoi—may provide important baseline data for investigations of genetic changes during establishment and adaptation processes.
Introduction Responsible Editor: M. Rius. Reviewed by N. Jeffery and undisclosed experts. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00227-020-03790-y) contains supplementary material, which is available to authorized users. * Jonas C. Geburzi jonas.geburzi@leibniz‑zmt.de 1
Zoological Institute, Population Genetics, Kiel University, Am Botanischen Garten 1‑9, 24118 Kiel, Germany
2
Zoological Museum Kiel, Hegewischstr. 3, 24105 Kiel, Germany
3
Alfred-Wegener-Institute for Polar and Marine Research, Wadden Sea Station, Hafenstr. 43, 25992 List/Sylt, Germany
4
Leibniz-Centre for Tropical Marine Research (ZMT), Mangrove Ecology, Fahrenheitstr. 6, 28359 Bremen, Germany
Continuously rising numbers of human-mediated introductions of species into areas far beyond their native ranges are increasingly recognised as an i
Data Loading...
