Parthenogenetic and Bisexual Populations of Ephemerella Notata Eat. in Poland

  • Adam Głazaczow

Abstract

The sex ratio (males: females) of final instar nymphs of Ephemerella notata varies from 0.12: 1.00 to 0.92: 1.00 in isolated populations of the Pomeranian Lake District in Poland. These data support the view that facultative parthenogenesis occurs in this species. The incidence of parthenogenesis was inversely related to population density. Parthenogenetic populations were less variable in size (determined by a principal component analysis of a total body-size index) and more synchronous in their development.

Keywords

Europe Editing Elodea 

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Adam Głazaczow
    • 1
  1. 1.Department of Systematic ZoologyAdam Mickiewicz UniversityPoznańPoland

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