Population genetic dynamics of an invasion reconstructed from the sediment egg bank

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2015
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Möst, Markus
Markova, Silvia
Aidukaite, Dalia
Baumgartner, Livia
Stich, Hans-Bernd
Wessels, Martin
Spaak, Piet
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Biological invasions are a global issue with far-reaching consequences for single species, communities and whole ecosystems. Our understanding of modes and mechanisms of biological invasions requires knowledge of the genetic processes associated with successful invasions. In many instances, this information is particularly difficult to obtain as the initial phases of the invasion process often pass unnoticed and we rely on inferences from contemporary population genetic data. Here, we combined historic information with the genetic analysis of resting eggs to reconstruct the invasion of Daphnia pulicaria into Lower Lake Constance (LLC) in the 1970s from the resting egg bank in the sediments. We identified the invader as ‘European D. pulicaria’ originating from meso- and eutrophic lowland lakes and ponds in Central Europe. The founding population was characterized by extremely low genetic variation in the resting egg bank that increased considerably over time. Furthermore, strong evidence for selfing and/or biparental inbreeding was found during the initial phase of the invasion, followed by a drop of selfing rate to low levels in subsequent decades. Moreover, the increase in genetic variation was most pronounced during early stages of the invasion, suggesting additional introductions during this period. Our study highlights that genetic data covering the entire invasion process from its beginning can be crucial to accurately reconstruct the invasion history of a species. We show that propagule banks can preserve such information enabling the study of population genetic dynamics and sources of genetic variation in successful invasive populations.

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570 Biowissenschaften, Biologie
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ancient DNA, asexual, Daphnia, egg bank, genetic variation, invasion
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ISO 690MÖST, Markus, Sarah OEXLE, Silvia MARKOVA, Dalia AIDUKAITE, Livia BAUMGARTNER, Hans-Bernd STICH, Martin WESSELS, Dominik MARTIN-CREUZBURG, Piet SPAAK, 2015. Population genetic dynamics of an invasion reconstructed from the sediment egg bank. In: Molecular Ecology. 2015, 24(16), pp. 4074-4093. ISSN 1365-294X. eISSN 1365-294X. Available under: doi: 10.1111/mec.13298
BibTex
@article{Most2015Popul-32060,
  year={2015},
  doi={10.1111/mec.13298},
  title={Population genetic dynamics of an invasion reconstructed from the sediment egg bank},
  number={16},
  volume={24},
  issn={1365-294X},
  journal={Molecular Ecology},
  pages={4074--4093},
  author={Möst, Markus and Oexle, Sarah and Markova, Silvia and Aidukaite, Dalia and Baumgartner, Livia and Stich, Hans-Bernd and Wessels, Martin and Martin-Creuzburg, Dominik and Spaak, Piet}
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