Responses of root-feeding nematodes (Helicotylenchus spp.) to local and non-local populations of the host plant Ammophila arenaria

摘要: The root-feeding nematode community of wild plants may vary throughout their natural range. Little is known about how the variation along range affects relationship with nematodes. In present study, we examined local and non-local combinations host nematodes to test hypothesis that reproduction favoured by hosts. two indoor experiments, exposed populations dune grass Ammophila arenaria from northern southern European coastal sand dunes plant parasitic species (Helicotylenchus spp.) those same geographical origins. First, used determine whether effect a versus depend on density. Then, in cross-inoculation experiment investigated both performed local, as compared hosts. In biomass ontogenetic characteristics were not significantly different between populations. applied densities did have negative impact performance. This allowed us consider response without co-varying differences responses. Reproduction differed according origin, but contrary what expected, perform better Helicotylenchus n. sp., originating Portugal, than host. Male female ratios lowest pseudorobustus Netherlands. Female juveniles percentages also quite distinct, more females Netherlands Portugal. We concluded ectoparasitic spp. do necessarily best population foredune A. arenaria. Our results imply distribution coast determined other factors These could be abiotic, e.g. water availability, or biotic, enemies adapted Introducing genotypes parts will, therefore, lead reduced abundance semi-endo