Not all non-natives are equally unequal: reductions in herbivore -diversity depend on phylogenetic similarity to native plant community

作者：Burghardt Karin T^*; Tallamy Douglas W

来源：Ecology Letters, 2015, 18(10): 1087-1098.

DOI：10.1111/ele.12492

• Beta diversity
• feeding guild
• herbivore
• host specificity
• insects
• managed landscapes
• native plant
• non-native plant
• spatial scale

Effects of host plant - and -diversity often confound studies of herbivore -diversity, hindering our ability to predict the full impact of non-native plants on herbivores. Here, while controlling host plant diversity, we examined variation in herbivore communities between native and non-native plants, focusing on how plant relatedness and spatial scale alter the result. We found lower absolute magnitudes of -diversity among tree species and among sites on non-natives in all comparisons. However, lower relative -diversity only occurred for immature herbivores on phylogenetically distinct non-natives vs. natives. Locally in that comparison, non-native gardens had lower host specificity; while among sites, the herbivores supported were a redundant subset of species on natives. Therefore, when phylogenetically distinct non-natives replace native plants, the community of immature herbivores is likely to be homogenised across landscapes. Differences in communities on closely related non-natives were subtler, but displayed community shifts and increased generalisation on non-natives within certain feeding guilds.

• 出版日期2015-10