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A comparison of egg-bank and long-term plankton dynamics of two Daphnia species, D. hyalina and D. galeata : potentials and limits of reconstruction

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2003

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Jankowski, Thomas

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Limnology and Oceanography. 2003, 48(5), pp. 1948-1955. eISSN 0024-3590. Available under: doi: 10.4319/lo.2003.48.5.1948

Zusammenfassung

Resting eggs of planktonic organisms from datable sediment cores are increasingly used to reconstruct historical information on the abundance, size, genetic composition, and microevolution of planktonic organisms. All of these studies have relied on the (up to now) mostly untested assumption that the resting egg bank in sediment will indeed allow an accurate reconstruction of past populations. Here we test the performance of the egg bank to reconstruct historical data of the Daphnia population of Lake Constance, which was thoroughly investigated throughout the past century. We show that it is possible to reproduce the variability in the abundance, size, and genetic composition of Daphnia galeata within a period of ~2 decades. Furthermore, resting egg data allowed us to reconstruct the timing of the invasion of D. galeata into Lake Constance. However, the egg bank did not reconstruct (1) the dynamics of the native Daphnia species of Lake Constance, D. hyalina, and (2) the relative importance of the two Daphnia species. We present evidence that the latter is caused by differences in the sexually reproductive activity between the two species. The failure to reconstruct the long-term dynamics of D. hyalina in the lake is most probably due to a change in the frequency and timing of sexual activity during the course of eutrophication.

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570 Biowissenschaften, Biologie

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long-term plankton, Daphnia species, egg-bank, limnologicalinstitute

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ISO 690JANKOWSKI, Thomas, Dietmar STRAILE, 2003. A comparison of egg-bank and long-term plankton dynamics of two Daphnia species, D. hyalina and D. galeata : potentials and limits of reconstruction. In: Limnology and Oceanography. 2003, 48(5), pp. 1948-1955. eISSN 0024-3590. Available under: doi: 10.4319/lo.2003.48.5.1948
BibTex
@article{Jankowski2003compa-8783,
  year={2003},
  doi={10.4319/lo.2003.48.5.1948},
  title={A comparison of egg-bank and long-term plankton dynamics of two Daphnia species, D. hyalina and D. galeata : potentials and limits of reconstruction},
  number={5},
  volume={48},
  journal={Limnology and Oceanography},
  pages={1948--1955},
  author={Jankowski, Thomas and Straile, Dietmar}
}
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