Competitive displacement of the native species Bursaphelenchus mucronatus by an alien species Bursaphelenchus xylophilus (Nematoda: Aphelenchida: Aphelenchoididae): a case of successful invasion
Competitive displacement of the native species Bursaphelenchus mucronatus by an alien species Bursaphelenchus xylophilus (Nematoda: Aphelenchida: Aphelenchoididae): a case of successful invasion
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DOI：
10.1007/s10530-008-9225-2
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发表时间：
2009-02-01
影响因子：
2.9
通讯作者：
Xie, Bing-Yan
中科院分区：
文献类型：
--
作者：
Cheng, Xin-Yue;Xie, Pei-Zhen;Xie, Bing-Yan
外来入侵物种的存在对当地生物多样性，特别是对生态系统中占据相同生态位的本地物种产生了严重的负面影响。研究外来入侵种松材线虫对其本地姊妹种B的影响。mucronatus，将两种线虫物种在真菌垫中混合培养并混合接种到敏感宿主中。通过比较竞争和非竞争条件下两个种群的繁殖参数，发现B. xylophilus明显高于B。在实验室培养条件下，此外，还研究了B.无论是在室内培养还是在寄主接种条件下，竞争条件下的小菜蛾幼虫的生长速率都远高于非竞争条件下的。松材线虫也排除B。当两种物种作为混合物培养较长时间时，两种在天然松林中的相对多度比也是通过随机抽样不同入侵历史地区的垂死松树来确定的。随着入侵年份的增加，B.而B. mucronatus减少。实验验证了入侵种B繁殖力高、竞争能力强的假设。木生菌比本地种B更有竞争力。mucronatus和取代它在自然生态系统中。B的成功入侵。竞争置换可能是其生态入侵机制之一。
The presence of alien invasive species has serious negative impact on endemic biodiversity, especially on native species that occupy the same niche in the ecosystem. To study the influence of the alien invasive species Bursaphelenchus xylophilus on its native sister species B. mucronatus, the two nematode species were mix-cultured in a fungal mat and mix-inoculated into a susceptible host. By comparing the propagation parameters of both species under competitive and noncompetitive conditions it was shown that the propagation level of B. xylophilus was clearly higher than that of B. mucronatus under laboratory culture. Furthermore, the propagation capacity of B. xylophilus under competitive conditions was much higher than that under noncompetitive conditions, both in laboratory culture and with host inoculation. Bursaphelenchus xylophilus also excluded B. mucronatus when the two species were cultured as a mixture for a longer time. The relative abundance ratios of the two species in natural pinewoods were also determined by random sampling of dying pine trees from regions with different invasion histories. It was noted that with an increase in invasion years the distribution frequency of B. xylophilus increased while that of B. mucronatus decreased. Experimental tests verified our hypothesis that because of its high fecundity and strong competitive ability, the invasive species B. xylophilus out-competed the native species B. mucronatus and displaced it in natural ecosystems. The successful invasion of B. xylophilus is attributed to competitive displacement, which may be one of the ecological invasive mechanisms.