The contrasting roles of host species diversity and parasite population genetic diversity in the infection dynamics of a keystone parasitic plant
The contrasting roles of host species diversity and parasite population genetic diversity in the infection dynamics of a keystone parasitic plant
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DOI：
10.1111/1365-2745.13050
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发表时间：
2019-01-01
影响因子：
5.5
通讯作者：
Craig，Hayley
中科院分区：
文献类型：
--
作者：
Rowntree，Jennifer K.;Craig，Hayley
物种间的多样性和物种内的遗传多样性都是生态群落的重要组成部分，可以决定物种之间，特别是宿主和寄生虫之间相互作用的结果。我们试图了解物种多样性对宿主社区抵抗感染的关键寄生植物（Rhinanthus minorL.）和遗传多样性的寄生虫，其成功地建立在草原community.We使用了一个实验方法，其中大盆种植的中营养型草地物种的混合物在高和低物种多样性。寄生植物播种的比例，这些与高和低的遗传多样性的治疗。建立的寄生虫进行了监测超过2年，并在每个生长季节结束时收获盆，以确定感染对植物群落biometh.We发现的寄生植物的建立上的宿主植物物种多样性的影响很强，成功建立相当低的高物种多样性治疗。在高物种多样性处理中，遗传多样性促进了寄生虫的建立，在低物种多样性处理中，遗传多样性也促进了寄生虫的长期适应性。寄主群落结构受R.寄生虫存在时，牧草相对生物量降低，豆科植物相对生物量增加。寄生虫的存在对非豆科杂类的相对生物量没有直接影响。我们的数据表明，主机社区物种多样性的重要性，在阻止建立一个通才寄生虫。他们还强调了遗传多样性在决定多物种群落中宿主-寄生虫相互作用结果方面的作用。因此，这些发现对物种丰富的草原的建立和管理具有重要意义，并为寄生植物及其宿主的群落动态提供了见解。
Diversity among species and genetic diversity within species are both important components of ecological communities that can determine the outcome of species interactions, especially between hosts and parasites. We sought to understand the impact of species diversity on host community resistance to infection by a keystone parasitic plant (Rhinanthus minorL.) and genetic diversity of the parasite on its successful establishment in a grassland community.We used an experimental approach where large pots were planted with mixtures of mesotrophic grassland species at high and low species diversity. The parasitic plant was sown in a proportion of these with high and low genetic diversity treatments. Establishment of the parasite was monitored over 2 years and the pots harvested at the end of each growing season to determine the impact of infection on plant community biomass.We found a strong effect of host plant species diversity on the establishment of the parasitic plant, with successful establishment considerably lower in the high species diversity treatment. Genetic diversity appeared to promote establishment of the parasite in the high species diversity treatment, and also facilitated longer term fitness in the low species diversity treatment. Host community structure was influenced byR. minor, with grass relative biomass decreasing and legume relative biomass increasing when the parasite was present. There was no direct impact of the presence of the parasite on the relative biomass of nonleguminous forbs.Synthesis. Our data demonstrate the importance of host community species diversity in deterring the establishment of a generalist parasite. They also highlight the role of genetic diversity in determining the outcome of host–parasite interactions in multispecies communities. These findings, therefore, have important implications for the establishment and management of species‐rich grasslands and provide insight into the community dynamics of parasitic plants and their hosts.