生物多样性 ›› 2020, Vol. 28 ›› Issue (4): 504-514.DOI: 10.17520/biods.2019359

• 研究报告: 动物多样性 • 上一篇    下一篇

澜沧江流域水生昆虫群落分类多样性和功能多样性海拔格局的空间尺度依赖性

魏慧玉,陈凯(),王备新   

  1. 南京农业大学植物保护学院昆虫系昆虫分类与水生昆虫实验室, 南京 210095
  • 收稿日期:2019-11-08 接受日期:2020-02-10 出版日期:2020-04-20 发布日期:2020-06-15
  • 通讯作者: 陈凯
  • 基金资助:
    国家自然科学基金(51509159);中央高校基本科研业务费专项基金(KYZ201820)

The spatial scale dependency of elevational patterns of taxonomic and functional diversity in aquatic insects in the Lancang River, Yunnan, China

Huiyu Wei,Kai Chen(),Beixin Wang   

  1. Laboratory of Insect Taxonomy & Aquatic Insects, Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095
  • Received:2019-11-08 Accepted:2020-02-10 Online:2020-04-20 Published:2020-06-15
  • Contact: Kai Chen

摘要:

群落分类多样性和功能多样性的海拔格局研究, 是了解生物多样性空间分布现状、揭示多样性维持和变化机制的重要途径。当前对水生昆虫分类多样性和功能多样性沿海拔梯度分布格局, 及其尺度依赖性依旧缺乏深入研究。本文基于2013-2018年在云南澜沧江流域500-3,900 m海拔梯度共149个溪流点位的水生昆虫群落调查数据, 利用线性或二次回归模型探索并比较了局部尺度(点位尺度)和不同区域尺度(100 m、150 m、200 m、250 m海拔段)的分类多样性指数(物种丰富度指数、Simpson多样性指数和物种均匀度指数)和功能多样性指数(树状图功能多样性指数(dbFD)、Rao二次熵指数(RaoQ)和功能均匀度指数(FEve))的海拔格局。结果表明, 在局部尺度, 物种丰富度指数和dbFD指数沿海拔梯度均无显著分布特征, Simpson多样性指数、RaoQ指数、物种均匀度指数和FEve指数沿海拔梯度呈现U型或者单调递减趋势。在区域尺度, 随着区域海拔带宽度的增加, 物种丰富度指数沿海拔呈不显著的单调递减格局, 但dbFD指数沿海拔分布由U型转变为单调递减趋势; Simpson多样性指数和RaoQ指数沿海拔梯度由显著U型趋势转变为无显著分布特征; 物种均匀度指数沿海拔梯度无显著分布特征, 但FEve指数呈显著增加的海拔格局。综上, 群落分类多样性指数和功能多样性指数沿海拔梯度分布存在局部和区域尺度的空间差异, 但区域尺度下二者海拔格局随海拔带宽度的增加存在一定程度的一致性。

关键词: 生物多样性, 功能性状, 海拔梯度, 局部尺度, 区域尺度, 溪流, 生物地理学

Abstract:

Elevational patterns of taxonomic and functional diversity are important aspects of biodiversity maintenance and changes. However, the spatial scale dependency of elevational patterns on taxonomic and functional diversity of aquatic insect assemblages remains unclear. Using data collected from 149 stream sites along elevational gradients ranging between 500-3,900 m during 2013-2018 in the upper basin of Lancang River in Yunnan Province, China, we examined how elevational patterns of taxonomic and functional diversity of aquatic insect assemblages differed across local and regional scales among multiple elevational bands (i.e., 100, 150, 200, and 250 m). We used linear or quadratic regression models to explore the elevational patterns of taxonomic richness index, Simpson diversity index, evenness index, dendrogram- based functional diversity index (dbFD), Rao’s Quadratic index (RaoQ), and functional evenness index (FEve). At the local scale, taxonomic richness index and dbFD index show no significant elevational patterns; while Simpson diversity index, RaoQ index, evenness index, and FEve index show either U-shaped or monotonically decreasing trends along elevation gradients. At the regional scale with increasing elevation, taxonomic richness index decreases (NS) while dbFD index changes from U-shaped to a monotonically decreasing trend along the elevational gradient. Both Simpson diversity index and RaoQ index change from a significant U-shaped to no significant regional elevational patterns. Taxonomic evenness index and FEve index have no significant relationship with and significantly increased with regional elevations, respectively. Our results show that aquatic insect taxonomic and functional diversity are scale dependent across elevations. However, we observed a degree of consistency in elevational patterns for each taxonomic and functional diversity index across elevational bands at regional scales.

Key words: biodiversity, functional traits, elevation gradients, local scale, regional scale, stream, biogeography