PDF(Pubmed)
Abstract：
Sirex noctilio, a European woodwasp, occasionally shares resources with the native S. nitobei and other colonizers in northeast China. The impact of its coexistence on individual species remains unclear. Random sampling was conducted to assess the patterns and extent of insect co-colonization across various spatial scales. Additionally, we analyzed wood sections to determine the density, adult size, and distribution of the two Sirex species. Spatial scales revealed negative associations (Asemum striatum and Phaenops sp.) and neutral ones (Ips acuminatus) between woodwasps and other co-colonizers. Clustering of woodwasps and Phaenops sp. occurred at a small scale (0-7.3 m). Regression analysis showed a positive correlation between the chance of woodwasp attacks and past attacks on the same host, with little impact from other colonization factors. The distribution and body size of S. noctilio within the tree appeared unaffected by S. nitobei\'s presence. In the presence of S. noctilio, S. nitobei tended to lay eggs in damaged sections. At the stand level, the overall impact of S. noctilio on S. nitobei population density is likely positive because S. nitobei prefer weaker trees, a preference potentially influenced by initial attacks from S. noctilio on healthier hosts.
摘要：
Sirexnoctilio,一只欧洲的木蜂,偶尔与中国东北的土生土长的S.nitobei和其他殖民者分享资源。其共存对单个物种的影响尚不清楚。进行随机抽样以评估跨各种空间尺度的昆虫共定殖的模式和程度。此外,我们分析了木材截面来确定密度，成人尺寸,以及两种Sirex物种的分布。空间尺度显示出负相关性（纹状体和Phaenopssp。）和木黄蜂和其他共同定殖者之间的中性（Ipsacuminatus）。木蜂和Phaenopssp的聚类。发生在小规模(0-7.3米)。回归分析显示,木蜂攻击的机率与过去攻击同一宿主的机率呈正相关,受其他定殖因素的影响很小。针叶草在树内的分布和体型似乎不受针叶草的存在的影响。在S.noctilio的存在下，美国尼托贝倾向于在受损的部分产卵。在展台级别，noctilio对nitobei种群密度的总体影响可能是积极的，因为nitobei喜欢较弱的树木，一种偏好可能受到诺克利奥对健康宿主的初始攻击的影响。
