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  The population genetic consequences of diapause in Eudiaptomus copepods

Bohonak, A. J., Holland, M. D., Santer, B., Zeller, M., Kearns, C. M., & Hairston, Jr., N. G. (2006). The population genetic consequences of diapause in Eudiaptomus copepods. "Natural selection is ecology in action". Dedicated to Professor Dr. Winfried Lampert on the occasion of his 65th birthday, 183-202. doi:10.1127/0003-9136/2006/0167-0183.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D869-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D86A-3
Genre: Journal Article

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 Creators:
Bohonak, Andrew J., Author
Holland, Matthew D., Author
Santer, Barbara1, Author              
Zeller, Martina1, Author              
Kearns, Colleen M., Author
Hairston, Jr., Nelson G., Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: effective population size; Eudiaptomus gracilis; Eudiaptomus graciloides; genetic population structure; mitochondrial DNA
 Abstract: Prolonged diapause (extended dormancy) is thought to greatly influence evolution in freshwater invertebrates by lengthening generation time, promoting higher levels of dispersal among populations by wind or animal vectors, and increasing effective population size. However, empirical tests of these predictions are relatively rare. Comparative studies can be informative in this regard, if the comparisons involve sympatric, closely related species that differ only in the presence or absence of a dormant life history stage. We built upon a previous study by ZELLER et al. (2006), which used this approach to study patterns of microsatellite variation in Eudiaptomus copepods from northern Europe. E. graciloides possesses diapausing eggs and adults, whereas the closely related species E. gracilis is ecologically and trophically similar but lacks diapause. To separate further historical processes from recent anthropogenic influences, we examined mitochondrial DNA sequence variation in these species from three lakes in northern Germany where they are sympatric. Biotic and abiotic variation among contemporary and historical populations was minimized by focusing on hydrologically linked lakes separated by less than 10 km. E. gracilis and E. graciloides possess very different patterns of mtDNA variation. Both species possess significant population structure on small spatial scales, but E. graciloides has far fewer alleles despite a larger average divergence. Phylogeographic analyses and Bayesian skyline plots revealed evidence for historic population expansions in both species, with the growth phase beginning thousands of generations earlier in E. gracilis than in E. graciloides. Levels of genetic diversity suggest that effective population size may be an order of magnitude larger in E. gracifis than in E. graciloides, even though E. graciloides possesses a diapausing egg bank. Although this would seem to be an ideal system for quantifying the genetic role of diapause, we found no support for the assumption that freshwater invertebrates with diapause categorically possess larger effective population sizes and higher rates of gene flow than closely related species that lack diapause.

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Language(s): eng - English
 Dates: 2006-09
 Publication Status: Published in print
 Pages: -
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 Identifiers: eDoc: 291437
DOI: 10.1127/0003-9136/2006/0167-0183
Other: 2501/S 38578
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Title: "Natural selection is ecology in action". Dedicated to Professor Dr. Winfried Lampert on the occasion of his 65th birthday
Source Genre: Issue
 Creator(s):
Boersma, Maarten1, Editor            
Santer, Barbara1, Editor            
Affiliations:
1 Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547            
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 183 - 202 Identifier: -

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Title: Archiv für Hydrobiologie
  Alternative Title : Arch. Hydrobiol.
Source Genre: Journal
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Pages: - Volume / Issue: 167 (1-4) Sequence Number: - Start / End Page: - Identifier: ISSN: 0003-9136