Do native parasitic plants cause more damage to exotic invasive hosts than native non-invasive hosts? An implication for biocontrol.
Do native parasitic plants cause more damage to exotic invasive hosts than native non-invasive hosts? An implication for biocontrol.
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DOI：
10.1371/journal.pone.0034577
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Song W
中科院分区：
文献类型：
--
作者：
Li J;Jin Z;Song W
实地研究表明，本地寄生植物在入侵植物上生长旺盛，对入侵植物造成的伤害比本地植物更大。但目前尚无实证检验，其作用机制尚不清楚。为了量化寄生植物对寄主的危害及其与寄主生长速率和资源利用效率的关系，我们利用3对同源的外来、入侵和本地、非入侵草本植物进行了完全随机温室试验。寄生植物在外来入侵寄主上的生物量显著高于在原生非入侵寄主上的生物量。寄生物对外来的、入侵的寄主造成的伤害大于对同类的、本地的、非入侵的寄主。寄生物对寄主的危害程度与寄主生物量呈显著正相关。寄生物对寄主的危害与其寄主植物的相对生长速率和资源利用效率呈显著正相关。这可能是寄生植物在入侵寄主上生长更旺盛的机制，并且对外来入侵寄主造成比本地非入侵寄主更大的伤害。这些结果表明，本地植物和寄生植物通过降低入侵物种在入侵群落中的优势地位，对入侵物种具有潜在的生物控制作用。
Field studies have shown that native, parasitic plants grow vigorously on invasive plants and can cause more damage to invasive plants than native plants. However, no empirical test has been conducted and the mechanism is still unknown. We conducted a completely randomized greenhouse experiment using 3 congeneric pairs of exotic, invasive and native, non-invasive herbaceous plant species to quantify the damage caused by parasitic plants to hosts and its correlation with the hosts' growth rate and resource use efficiency. The biomass of the parasitic plants on exotic, invasive hosts was significantly higher than on congeneric native, non-invasive hosts. Parasites caused more damage to exotic, invasive hosts than to congeneric, native, non-invasive hosts. The damage caused by parasites to hosts was significantly positively correlated with the biomass of parasitic plants. The damage of parasites to hosts was significantly positively correlated with the relative growth rate and the resource use efficiency of its host plants. It may be the mechanism by which parasitic plants grow more vigorously on invasive hosts and cause more damage to exotic, invasive hosts than to native, non-invasive hosts. These results suggest a potential biological control effect of native, parasitic plants on invasive species by reducing the dominance of invasive species in the invaded community.
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