不同热带地区林冠植食性甲虫Beta多样性分布格局及影响因子探讨

The beta diversity, an important component of biological diversity index, which was determined as the compositional change in species assemblages across temporal and spatial scale, has been used widely to describe the diversity distribution pattern recently. The beta diversity level was affected by niche process, dispersal limitation and geography evolutionary history combined. To explore the beta diversity distribution pattern of different fauna group and their influencing factors between the habitats which is similar though in a larger distance and which is not similar but in a smaller distance is a fundamental question in the community ecology and population evolutionary biogeography. The herbivorous beetles of forest canopy, as the important indicator taxon of tropical forest canopy diversity, not only occupied the similar niche but also have the same dispersal ability. In the present study, we test the hypothesis that the distribution pattern of Coleoptera insect assemblages was regulated by different mechanisms. The three sampling plots in the southern China were selected including Xishuangbanna of southern Yunnan, Daweishan of southeastern Yunan and the Jianfengling of Hainan. Through the standard quantized sampling method we collect the herbivorous beetle insects within forest canopy and tree stem. We want to detect the response of Coleoptera insect assemblage to host specificity of dominant and rare tree species within tropical rainforest. Furthermore, we try to study how the distance and habitat affect the species distribution and dispersal ability through linking the flora and geography evolutionary history as well as the mechanisms on maintenance of high diverse Coleoptera insect assemblages in tropical forest canopy.

物种beta多样性已广泛用于表述多样性分布格局,其水平受生态位过程、散布限制及地质进化历史等综合影响。了解不同生物类群的beta多样性分布格局及影响因素，特别是空间相距较远而生境条件相似，以及空间相距较近但生境条件迥异的两个地点上种群的beta多样性水平，是群落生态学和进化生物地理学的一个基础性命题。冠层植食性甲虫不仅生态位相似，且散布能力基本相当。作为热带森林林冠多样性的重要指示类群,其分布规律尚待研究。本项研究拟以中国南方（滇南西双版纳、滇东南屏边大围山和海南尖峰岭）三个不同热区森林冠层植食性甲虫为研究对象，通过标准量化的取样方式收集树木冠层和树干内部的昆虫，探讨beta多样性构成和群落相似性水平对两类宿主树种（优势种和稀有种）特异性的响应机制，以及距离和生境两个因子的作用对种群扩散的影响，并联系植物区系地理和地质进化历史解释热带地区极其丰富多样的植食性甲虫形成的原因和维持机制。

物种beta多样性已广泛用于表述多样性分布格局,其水平受生态位过程、散布限制及地质进化历史等综合影响。了解不同生物类群的beta多样性分布格局及影响因素，特别是空间相距较远而生境条件相似，以及空间相距较近但生境条件迥异的两个地点上种群的beta多样性水平，是群落生态学和进化生物地理学的一个基础性命题。冠层植食性甲虫不仅生态位相似，且散布能力基本相当。作为热带森林林冠多样性的重要指示类群,其分布规律尚待研究。本项研究以中国南方（滇南西双版纳、滇东南屏边大围山和海南尖峰岭）三个不同热区森林冠层植食性甲虫为研究对象，通过标准量化的取样方式收集树木冠层和树干内部的昆虫，探讨beta多样性构成和群落相似性水平对两类宿主树种（优势种和稀有种）特异性的响应机制，以及距离和生境两个因子的作用对种群扩散的影响，并联系植物区系地理和地质进化历史解释热带地区极其丰富多样的植食性甲虫形成的原因和维持机制。本研究前期部分已发表研究成果表明地区植物以及树木多样性水平是决定热带冠层植食性甲虫beta多样性分布格局的主要因素，热带林区植食性甲虫beta多样性变化格局整体表现出较低的分布模式，这是与植食性甲虫相对较为一致的散布能力相关的。本研究在对比全球其他热带地区的研究案例过程中发现，热带植食性甲虫的beta多样性分布格局受多方面因素的影响，但植物或者树木的多样性水平是决定其分布格局的主要作用因素。本研究对阐明和了解热带地区冠层植食性甲虫的多样性分布机制以及热带地区生物多样性的维持机制具有一定的指导和参考价值。