水生态学杂志2017，Vol.38Issue(6)：40-47,8.DOI:10.15928/j.1674-3075.2017.06.006
内蒙古乌梁素海浮游植物优势种的生态位分析
Ecological Niche Analysis of Dominant Phytoplankton Species in Wuliangsuhai Lake, Inner Mongolia
摘要
Abstract
Ecological niche is a fundamental theory of modern ecology and two important aspects are niche breadth and niche overlap.The concept applies to ecological differentiation within a population across an environmental gra-dient.The objective of this study was to explore phytoplankton community structure and the relationships between species and utilization of environmental resources in Wuliangsuhai Lake.Niche breadth and overlap of dominant summer and winter phytoplankton species in Wuliangsuhai Lake were analyzed using the formulations of Levin and Petraitis.In July 2011 and February 2012 , phytoplankton sampling was carried out from 09 :00 to 15 :00 at 10 sampling sites on Wuliangsuhai Lake.Sites were located at the lake entrance and exit, the different morphologi-cal sections, water functional areas and hydrologic controls.A total of 40 phytoplankton belonging to 35 genera and 7 phyla were identified during the investigation, with significant variation in species composition between summer and winter.In summer, 37 phytoplankton species from 33 genera were observed with dominance by Chlorophyta (15 species, 14 genera) , while in winter, 24 species from 21 genera were observed with dominance by Chlorophy-ta (8species, 7 genera) and Bacillariophyta (6 species, 6 genera).The total phytoplankton density was (3.62 ± 4.12) ×107 cell/L in summer and (1.32 ±0.98) ×107 cell/L in winter, with an average value of (2.47 ±3.14) ×107 cell/L over the two seasons.The niche breadth of Coelastrum microporum, Scenedesmus mey, Phormidium tenu, Oscillatoria vauch(>3.6) was relatively wide in summer and the niche breadth of Synedra ehrenberg, Eugle-na caudate( >5.0 ) was wide in winter, indicating that Coelastrum microporum, Scenedesmus mey, Phormidium tenu, Oscillatoria vauch had broader tolerances and better use of environmental resources in summer, while Synedra ehrenberg, Euglena caudate were more competitive in winter.Niche overlap for the same species was significantly different between summer and winter.Analysis of the ecological response rate indicates that the growth space of dominant species in summer expanded, except for Navicula bory, and the growth space of Phormidium tenu was lar-gest, followed by Spirulina princeps.The growth space of Synedra ehrenberg, Monochrysis skuja, and Cryptomonas ovata receded in winter and the growth space of Phormidium tenu was largest.Canonical correspondence analysis ( CCA) shows that the growth of Phormidium tenu and Spirulina princeps depended strongly on water temperature and Synedra ehrenberg growth depends more on pH.The abundance of most phytoplankton species decreased with increased salt concentration.关键词
浮游植物/优势种/生态位/乌梁素海Key words
phytoplankton/dominant species/ecological niche/Wuliangsuhai Lake分类
生物科学引用本文复制引用
李兴,李建茹,李畅游..内蒙古乌梁素海浮游植物优势种的生态位分析[J].水生态学杂志,2017,38(6):40-47,8.基金项目
国家自然科学基金(51469026) （51469026）
内蒙古机电职业技术学院院级科研项目(NJDZJZRQN1710) （NJDZJZRQN1710）
内蒙古青年科技英才计划项目(NJYT-15-B09) （NJYT-15-B09）
内蒙古自然科学基金(2016MS0553). （2016MS0553）
