- THIS ARTICLE
- Full Text (PDF)
- Alert me when this article is cited
- Alert me if a correction is posted
- SERVICES
- Similar articles in this journal
- Similar articles in PubMed
- Alert me to new issues of the journal
- Download to citation manager
- Reprints & Permissions
- CITING ARTICLES
- Citing Articles via HighWire
- Citing Articles via Google Scholar
- GOOGLE SCHOLAR
- Articles by Hebert, P. D. N.
- Search for Related Content
- PUBMED
- PubMed Citation
- Articles by Hebert, P. D. N.
ENZYME VARIABILITY IN NATURAL POPULATIONS OF DAPHNIA MAGNA II. GENOTYPIC FREQUENCIES IN PERMANENT POPULATIONS
Paul D. N. Hebert 1
1 School of Biological Sciences, University of Sydney, Sydney, Australia
In permanent habitats populations of the cyclical parthenogen, Daphnia magna, reproduce by continued parthenogenesis and are subject to only sporadic sexual recruitment. The genetic effects of this breeding system have been investigated by analyzing allozyme frequencies in thirteen populations of D. magna.—Genotypic frequencies at polymorphic loci characteristically deviated markedly from Hardy-Weinberg proportions and gametic phase imbalance between loci was frequent. Genotypic frequencies were subject to violent, selectively determined oscillations over short periods of time. These observations suggest that permanent populations of D. magna ordinarily consist of a limited number of highly structured genotypes. The adaptational advantages offered by such structuring may have been a major selective factor favoring the evolution of cyclical parthenogenesis.
Submitted on October 25, 1973Revised on January 7, 1974
This article has been cited by other articles:
 |
|
 |
|
  L. K. Hembre and R. O. Megard Direct and indirect effects of predation on the genetic structure of a Daphnia population J. Plankton Res., December 1, 2006; 28(12): 1129 - 1141. [Abstract] [Full Text] [PDF]
|
|