Dr. Sabine Hänniger

   Department of Entomology
 Phone:+49 (0)3641 57 1516Max Planck Institute for Chemical Ecology
 Fax:+49 (0)3641 57 1502Hans-Knöll-Straße 8
  emailD-07745 Jena

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PhD Thesis

Chasing Sympatric Speciation. The relative importance and genetic basis of prezygotic isolation barriers in diverging populations of Spodoptera frugiperda
University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics, Faculty of Science
First Supervisor: Prof. D.G. Heckel
Co-Supervisor(s): Prof. Dr. A.T. Groot, Dr. G. Schöfl (HKI Jena)
Retrieved from Thesis (hosted by MPI)

This thesis investigates the mechanisms underlying three prezygotic isolation barriers between the corn- and the rice-strains of the noctuid moth Spodoptera frugiperda to determine possible interactions between these isolation barriers and their relative importance for sympatric speciation. First, we investigated the role of host plant differentiation as isolation barrier between the two strains. Second, I focused on differentiation in sexual communication between the two strains. The third and most consistent prezygotic isolation barrier between the two strains is allochronic differentiation, i.e. the strains differ in the daily timing of their sexual activities. Finally, the relative importance and possible interactions between the three prezygotic isolation barriers between the two strains in S. frugiperda are discussed.