Morphological variation between allopatric populations of Steinernema kraussei (Steiner, 1923) (Rhabditida: Steinernematidae)

S. Patricia Stock, Zdenek Mráček, John M. Webster

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Morphometrics of four Canadian, three US and two European isolates representing distinct geographic populations of Steinernema kraussei (Steiner, 1923) were compared and analysed by multivariate analysis. A total of 540 individuals (270 males and 270 third-stage infective juveniles) representing the nine populations was measured. Fourteen morphometric variables were selected and subjected to principal component and canonical analyses. Results from both analyses indicate that there are morphological differences among the studied isolates, and that these differences are congruent with their geographic origin. The European isolates were shown to be distinctly different from the North American isolates. Within the North American isolates, the western isolates were distinguished from the eastern one (Parishville). No significant differences were observed between the two European isolates studied.

Original languageEnglish (US)
Pages (from-to)143-152
Number of pages10
Issue number2
StatePublished - 2000


  • Entomopathogenic nematodes
  • Geographic isolates
  • Morphological diversity
  • Multivariate analysis
  • Steinernematids

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Agronomy and Crop Science


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