湖泊科学2024，Vol.36Issue(5)：1392-1402,中插6-中插9,15.DOI:10.18307/2024.0515
金沙江上游主要支流着生藻类群落的空间格局及其影响因子
Spatial pattern of periphytic algae communities in major tributaries of the upper Jinsha River and the environmental drivers
摘要
Abstract
Periphytic algae constitute integral components of river ecosystems,serving as a starting point in the food chain of aquat-ic ecosystems.They play a crucial role in maintaining ecological diversity,energy flow,and material transfer within ecosystems.Benthic algae respond rapidly to anthropogenic disturbances and environmental changes,and are widely used in river biodiversity monitoring and water environment assessment.Comparing the species composition and distribution among periphytic algae communi-ties in different rivers along with elucidating their relationships with riverine environments,contributes to a better understanding of mechanisms maintaining river biodiversity.Therefore,we sampled periphytic algae from 38 sites in the main tributaries of the upper Jinsha River(i.e.,Sequ River,Zengqu River,Ouqu River and Zangqu River)during May and June of 2021,and recorded their environmental conditions.The influence of environmental factors on the community structure of periphytic algae was analyzed using the redundancy analysis method.Results revealed 91 taxa of periphytic algae,belonging to 3 phyla and 34 genera,with Bacillario-phyta as the most species-rich group.Periphytic algae density in the major tributaries of the upper Jinsha River varied from 0.002× 105-2.43×105 cells/cm2 and the biomass varied from 0.3×10-3-1.56 mg/cm2.No significant differences were found in benthic algae density and biomass among the various tributaries.In the Sequ River,dominant species included Lyngbya semiplema,Calo-thrix sp.and Navicula minima.In the Zengqu River,dominant species included Lyngbya semiplema,Diatoma tenue and Synedra tabulata.The Ouqu River exhibited dominant species such as Lyngbya semiplema,Fragilaria intermedia and Cymbella hustedtii.In the Zangqu River,the dominant species were Lyngbya semiplema,Lyngbya hieronymusii and Cymbella perpusilla.Redundancy anal-ysis indicated that conductivity,pH,channel width and dissolved oxygen were the main driving factors affecting the community struc-ture of the dominant taxa in main tributaries of the upper Jinsha River.These findings suggested that environmental filtering played a role in the spatial patterns of periphytic algae communities in the upper Jinsha River.This study provides basic data and a theoretical basis for the sustainable management and conservation of aquatic ecosystems in the main tributaries of the upper Jinsha River.关键词
水生生物/指示物种/群落结构/河流健康/青藏高原/金沙江Key words
Aquatic organisms/indicator species/community structure/river health/Qinghai-Tibet Plateau/Jinsha River引用本文复制引用
尚坤钰,韩毓,高欣,孙丹丹,姜昊,吴兴华,林鹏程..金沙江上游主要支流着生藻类群落的空间格局及其影响因子[J].湖泊科学,2024,36(5):1392-1402,中插6-中插9,15.基金项目
国家重点研发计划项目(2022YFC3202404)、中国生物多样性监测与研究网络内陆水体鱼类多样性监测网项目、中国长江三峡集团有限公司项目(201903144)和中国电建集团成都勘测设计研究院有限公司科研项目和知识创新专项-基础研究项目(2022020801010141)联合资助. （2022YFC3202404）
