| 摘要: |
| 周转（一个集合体中的物种在另一个集合体中被其他物种代替）和嵌套（物种贫乏的集合体是物种丰富集合体的严格子集）是形成β多样性的两种途径.本文采用Baselga提出的β多样性加法分解方法，对云南高原湖泊软体动物β多样性及其周转和嵌套组分进行了研究.利用多位点方法计算，结果表明云南高原湖泊软体动物总β多样性为0.8903（Sørensen指数法）和0.9419（Jaccard指数法），周转组分分别占总β多样性的80.93%（Sørensen指数法）和88.92%（Jaccard指数法）.总β多样性为瓣鳃类 > 腹足类，金沙江水系 > 南盘江水系 > 澜沧江水系 > 元江水系，浅水型 > 深水型.周转组分占总β多样性的比例为瓣鳃类 > 腹足类，元江水系 > 南盘江水系 > 澜沧江水系 > 金沙江水系，深水型>浅水型.采用配对的方法计算结果表明，不同湖泊对软体动物总β多样性及其周转、嵌套成分的值分布形式不同.周转的成分分布比较均匀，嵌套成分呈现一种单峰的分布.周转成分最大值为1，最小值为0，表明湖泊对间β多样性存在着完全的周转和完全的嵌套形式，所以相应地要采取多区域保护和重点保护相结合的策略保护云南高原湖泊软体动物. |
| 关键词: 软体动物 β多样性 周转 嵌套 湖泊 云南高原 |
| DOI：10.18307/2018.0518 |
| 分类号: |
| 基金项目:安徽高校省级自然科学研究一般项目（2015KJ004）和阜阳师范学院自然科学研究项目（2015FSKJ01ZD）联合资助. |
|
| Analysis of the beta diversity of mollusk in the lakes of Yunnan Plateau |
|
WANG Weigen
|
|
School of Biology and Food Engineering of Fuyang Teachers College, Fuyang 236037, P. R. China
|
| Abstract: |
| Beta diversity can be a result of unique structuring processes:turnover (caused by species replacement from site to site) and nestedness (caused by species losses in nested subsets). Based on the Baselga proposed framework for beta diversity partitioning measures, the total beta diversity and its components of mollusk in the lakes of Yunnan Plateau were studied. According to multiple-site calculating methods, the results showed that the total beta diversity of the mollusk is 0.8903 (Sørensen index) and 0.9419 (Jaccard index). The turnover component accounted for 80.93% (Sørensen index) or 88.92% (Jaccard index) of the total beta diversity, respectively. The total beta diversity of Lamellibranchia is greater than that of Gastropoda, across basins from the highest to the lowest is that of Jinshajiang, Lancangjiang, Nanpanjiang and Yuanjiang, and total beta diversity of deep lakes is greater than that of shallow lakes. The proportion of beta diversity attributed to turnover of Lamellibranchia is higher than that of Gastropoda, across basins from the highest to the lowest is that of Yuanjiang, Nanpanjiang, Lancangjiang and Jinshajiang, and that of deep lakes is greater than that of shallow lakes. According to the pairwise measuring method, the distribution of total beta diversity and its turnover and nestedness components varied depend on lakes pair. The distribution pattern of turnover was uniform, and nestedness presented a unimodal model distribution. The maximum value of the turnover is 1, and the minimum value is 0, indicating that there are complete turnover and complete nestedness pattern between lakes. So, results suggest that mollusk conservation should not be focused solely on protecting lakes with the highest species richness, but should consider a variety of lakes across a region. |
| Key words: Mollusk beta diversity turnover nestedness lakes Yunnan Plateau |
