<b>Non-native plants engage differently in native infochemical networks via plant volatiles: avoiding herbivores but enhancing pollinator relationships</b>

Plant volatiles provide information that mediates interactions among plants, herbivores, predators, parasitoids, and pollinators. However, little is known about how volatiles released by non-native plant species integrate into information systems of the communities they invade. We compared arthropod communities on 25 non-native and 56 native species at 28 field sites and conducted bioassays and volatile analyses with 15 pairs of non-native and native congeners in a common garden experiment. Native species had much higher leaf arthropod abundances and diversities than non-natives both in the field survey and common garden experiment. In contrast, pollinator abundance and diversity were greater on non-native species than on native species. Leaf alkane and terpene volatiles related to insect preferences, were emitted at higher rates by native species and attracted more herbivores, whereas flower terpene volatiles were emitted at higher rates by non-native species and were more attractive to pollinators. Decreased preferences of herbivores for non-native species corresponded with less leaf damage, and increased preferences of pollinators for non-native species corresponded with higher seed production. We propose that plant volatiles from non-native plants engage in native infochemical networks in ways that minimize risks posed by herbivores, relative to native plants, but strengthen their interactions with mutualists.