Nematode community responses to range-expanding and native plant communities in original and new range soils

Many plant species expand their range to higher latitudes in response to climate change. However, it is poorly understood how biotic interactions in the new range differ from interactions in the original range. Here, in a mesocosm experiment, we analyze nematode community responses in original and new range soils to plant communities with either 1) species native in both the original and new range, 2) range-expanding species related to these natives (related range-expanders), or 3) range-expanders without native congeneric species in the new range (unrelated range-expanders). We hypothesized that nematode community shifts between ranges are strongest for unrelated range-expanders and minimal for plant species that are native in both ranges. As a part of these community shifts, we hypothesized that range-expanders, but not natives, would accumulate fewer root-feeding nematodes in their new range compared to their original range. Analyses of responses of nematodes from both original and n...

许多植物物种为应对气候变化而向高纬度地区扩展分布范围。然而，目前人们对新分布区的生物相互作用与原分布区的差异知之甚少。本研究通过中型实验，分析了原分布区和新分布区土壤中线虫群落对三类植物群落的响应：1) 在原分布区和新分布区均为本地种的植物；2) 与上述本地种亲缘关系较近的扩域物种（亲缘扩域种）；3) 在新分布区无本地同属物种的扩域物种（非亲缘扩域种）。我们假设，线虫群落在分布区间的变化对非亲缘扩域种最为显著，而对在两地均为本地种的植物则最微弱。作为群落变化的一部分，我们假设扩域物种（而非本地种）在新分布区积累的根食性线虫数量会少于其原分布区。对来自原分布区和新...