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

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2007
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Brede, Nora
Streit, Bruno
Schwenk, Klaus
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Hydrobiologia ; 594 (2007), 1. - pp. 83-89. - ISSN 0018-8158. - eISSN 1573-5117
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.
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570 Biosciences, Biology
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Ephippia,Hatching experiments,Cladocera,Ecology,Genetics,Lake Constance
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ISO 690BREDE, Nora, Dietmar STRAILE, Bruno STREIT, Klaus SCHWENK, 2007. The contribution of differential hatching success to the fitness of species and interspecific hybrids. In: Hydrobiologia. 594(1), pp. 83-89. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-007-9088-z
BibTex
@article{Brede2007contr-8363,
  year={2007},
  doi={10.1007/s10750-007-9088-z},
  title={The contribution of differential hatching success to the fitness of species and interspecific hybrids},
  number={1},
  volume={594},
  issn={0018-8158},
  journal={Hydrobiologia},
  pages={83--89},
  author={Brede, Nora and Straile, Dietmar and Streit, Bruno and Schwenk, Klaus}
}
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