| 引用本文: | 纪磊,何平,叶佳,彭水秀.近50年来洪湖鱼类群落分类学多样性变动.湖泊科学,2017,29(4):932-941. DOI:10.18307/2017.0417 |
| JI Lei,HE Ping,YE Jia,PENG Shuixiu.The taxonomic distinctness diversity of fish community in Lake Honghu during the past 50 years. J. Lake Sci.2017,29(4):932-941. DOI:10.18307/2017.0417 |
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| 摘要: |
| 基于洪湖1959-2004年鱼类群落状况的调查研究，应用分类学多样性指数分析洪湖鱼类群落分类学多样性的变动. 结果显示：受江湖阻隔及人为干扰加剧等因素影响，洪湖鱼类种、属的数目在1981年表现出下降的趋势，科以上的分类阶元的数目则在1993年之后明显减少. 对洪湖鱼类组成进行NMDS排序，1959、1964和1981年的鱼类群落组成较为类似，1993和2004年的群落组成则发生了较大的变化. 随着时间推移，分类差异性指数Δ+表现出先上升后下降的趋势，而变异分类差异性指数Λ+则表现出先下降后上升的趋势，表明随着人为干扰的增加，洪湖鱼类群落的分类学进化树的平均路径长度和均匀度发生了不同程度的变化. 零假设模型显示，5个时期的Δ+值都位于置信区间内，而1993和2004年的Λ+值却位于置信区间的上方，显示分类学进化树的均匀度显著下降. Δ+和Λ+值的变化提供了与物种数变化所蕴含的不同信息，在多样性评价研究中可以作为经典多样性指数的补充. 洪湖鱼类Λ+值随干扰程度的加剧而增加，表明这一指数在多样性保护和评价中具有良好的应用价值. |
| 关键词: 分类学多样性 洪湖 鱼类群落 环境干扰 多样性评价 |
| DOI：10.18307/2017.0417 |
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| 基金项目:安徽省自然科学基金项目（1708085QC71，1608085MC49）、资源植物生物学安徽省重点实验室科研基金项目（ZYZWSW2014006）、安徽省教育厅自然科学研究项目（KJ2017A384，KJ2015A302）和国家自然科学基金项目（31500594，41273089）联合资助. |
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| The taxonomic distinctness diversity of fish community in Lake Honghu during the past 50 years |
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JI Lei, HE Ping, YE Jia, PENG Shuixiu
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School of Life Sciences, Huaibei Normal University, Huaibei 235000, P.R.China
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| Abstract: |
| Based on the published literatures about fish assemblages in Lake Honghu, we measured the long-term changes in two taxonomic diversity indices (average taxonomic distinctness, Δ+ and variation in taxonomic distinctness, Λ+) at five periods (1959, 1964, 1981, 1993, 2004) during the half past century. The results showed that the numbers of species and genera declined from 1981, whereas the numbers of families and higher taxa decreased from 1993. Non-metric multidimensional scaling analysis based on species composition led to a separation of two groups, one grouping 1959, 1964 and 1981, the other gathering 1993 and 2004. Taxonomic distinctness indices displayed a first increase and subsequent decrease of Δ+, and a consistent increase of Λ+ through time. The five periods all fell within the 95% confidence interval for Δ+, but 1993 and 2004 fell significantly above the confidence interval for Λ+, indicating a higher unevenness of the distribution of taxa across the taxonomic tree than random expectations. Δ+ and Λ+ could provide complementary information about the variability of biodiversity in addition to traditional diversity indices, thus we proposed that taxonomic distinctness indices can be used as promising tools in studies of biodiversity and environmental assessment. |
| Key words: Taxonomic diversity Lake Honghu fish community environmental disturbance biodiversity assessment |
