Development of nematode behavior: sex attraction among different strains of the free-living Panagrellus redivivus

Abstract

The behavioral response of three genetically different stocks of the dioecious free-living nematode species complex Panagrellus redivivus – Panagrellus silusiae to mating attractant was examined. The male response to mating attractant showed strain differences, as did the nature of attractant produced by the females. The response of males is dose-dependent and showed optima at specific concentrations of females. These differences are under genetic control. Mating attraction increases inbreeding at low population densities and promotes outbreeding at high population densities. Several distinct attractants were isolated, at least one of which was protein, and none were ether-soluble. Most attractants were of low molecular weight, with only one high molecular-weight component.