Determinants of parasitoid communities of willow-galling sawflies: habitat overrides physiology, host plant and space

Molecular Ecology
T NymanHeikki Roininen

Abstract

Studies on the determinants of plant-herbivore and herbivore-parasitoid associations provide important insights into the origin and maintenance of global and local species richness. If parasitoids are specialists on herbivore niches rather than on herbivore taxa, then alternating escape of herbivores into novel niches and delayed resource tracking by parasitoids could fuel diversification at both trophic levels. We used DNA barcoding to identify parasitoids that attack larvae of seven Pontania sawfly species that induce leaf galls on eight willow species growing in subarctic and arctic-alpine habitats in three geographic locations in northern Fennoscandia, and then applied distance- and model-based multivariate analyses and phylogenetic regression methods to evaluate the hierarchical importance of location, phylogeny and different galler niche dimensions on parasitoid host use. We found statistically significant variation in parasitoid communities across geographic locations and willow host species, but the differences were mainly quantitative due to extensive sharing of enemies among gallers within habitat types. By contrast, the divide between habitats defined two qualitatively different network compartments, because many com...Continue Reading

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Citations

Jul 21, 2016·Current Opinion in Insect Science·John O Stireman
Aug 3, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Christopher C M BakerNaomi E Pierce
Aug 4, 2016·Genome Génome / Conseil National De Recherches Canada·Tomas Roslin, Sanna Majaneva
Apr 27, 2021·Current Opinion in Insect Science·George E HeimpelJacques Brodeur
Sep 26, 2021·Molecular Ecology Resources·Tomas RoslinMarko Mutanen

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