Pearse Ian S, Hipp Andrew L
Department of Entomology, Illinois Natural History Survey, 1816 South Oak Street, Champaign, IL 61820, USA
The Morton Arboretum, 4100 Illinois Route 53, Lisle, IL 60532, USA Deptartment of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, IL 60605, USA.
Proc Biol Sci. 2014 Nov 7;281(1794):20141841. doi: 10.1098/rspb.2014.1841.
There is often an inverse relationship between the diversity of a plant community and the invasibility of that community by non-native plants. Native herbivores that colonize novel plants may contribute to diversity-invasibility relationships by limiting the relative success of non-native plants. Here, we show that, in large collections of non-native oak trees at sites across the USA, non-native oaks introduced to regions with greater oak species richness accumulated greater leaf damage than in regions with low oak richness. Underlying this trend was the ability of herbivores to exploit non-native plants that were close relatives to their native host. In diverse oak communities, non-native trees were on average more closely related to native trees and received greater leaf damage than those in depauperate oak communities. Because insect herbivores colonize non-native plants that are similar to their native hosts, in communities with greater native plant diversity, non-natives experience greater herbivory.
植物群落的多样性与该群落被非本地植物入侵的可能性之间通常存在反比关系。在新植物上定居的本地食草动物可能通过限制非本地植物的相对生长而影响多样性与入侵可能性之间的关系。在此，我们表明，在美国各地的大型非本地橡树群落中，引入到橡树物种丰富度较高地区的非本地橡树比在橡树丰富度较低地区积累了更多的叶片损伤。这种趋势的根本原因是食草动物能够利用与其本地宿主亲缘关系较近的非本地植物。在多样化的橡树群落中，非本地树木平均而言与本地树木的亲缘关系更近，并且比在贫化的橡树群落中受到的叶片损伤更大。由于昆虫食草动物会在与其本地宿主相似的非本地植物上定居，因此在本地植物多样性较高的群落中，非本地植物遭受的食草动物侵害更大。
