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Hydrobiologia

, Volume 594, Issue 1, pp 83–89 | Cite as

The contribution of differential hatching success to the fitness of species and interspecific hybrids

  • N. BredeEmail author
  • D. Straile
  • B. Streit
  • K. Schwenk
Cladocera

Abstract

Resting egg banks of microcrustaceans have been used to reconstruct the evolutionary and ecological history of species. However, recent studies provided evidence for a discrepancy between dormant propagules in the sediment and the planktonic population. This pattern raises two questions: First, what is the value of data on resting egg banks for population dynamics over time and second, which component of the reproductive cycle causes the observed inconsistency? In our study we focussed on the second question by comparing the taxon composition of a resting egg bank with the reproductive success of ex-ephippial hatchlings. Species and interspecific hybrid identification of dormant and hatched stages was achieved through the application of restriction fragment length polymorphism analysis of an internal transcribed spacer region. We found no significant deviation between the proportion of hatched Daphnia galeata, D. galeata × hyalina and D. hyalina individuals and the observed taxon composition of the resting egg bank. However, species and hybrids differed in their mode and relative success of reproduction. We conclude that the components of reproductive success in Daphnia contribute differentially to the fitness of species and interspecific hybrids. The discrepancy between resting egg banks and “active” planktonic populations results not from differential hatching of species but from the reproductive success of ex-ephippial females and the timing and frequency of sexual reproduction of the different taxa.

Keywords

Ephippia Hatching experiments Cladocera Ecology Genetics Lake Constance 

Notes

Acknowledgements

For sharing his experience on hatching Lake Constance ephippia we thank T. Jankowski and for helpful assistance we thank M. Heger, C. Raue, M. Salinger, M. Wessels, G. Schmiedeskamp and E. Wörner.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Department of Ecology and EvolutionJ.W. Goethe-UniversityFrankfurt am MainGermany
  2. 2.Limnological InstituteUniversity of KonstanzKonstanzGermany

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