Xu Chun-Yan, Yu Qiu-Jia, Xu Feng-Jie, Hu Xue-Qin, You Wen-Hui
College of Resources and Environmental Science, East China Normal University, Shanghai 200062, China.
Ying Yong Sheng Tai Xue Bao. 2012 Sep;23(9):2550-8.
By using modified Levins and Petraitis formulae, this paper determined the niche breadth and niche overlap of the phytoplankton's dominant species in Dianshan Lake of East China, and analyzed the relationships between the niche breadth and niche overlap and the density and dominance of the dominant species. The niche breadth and niche overlap of the dominant species differed in different periods, and different dominant species had different adaptive capacity to the environmental factors. Based on their niche breadth in different seasons, the dominant species in the Lake could be classified into four groups, among which, Chroomonas acuta and Chlorella vulgaris had broader niche, more quantity, wider distribution, and better use of environmental resources. During cyanobacterial blooms, the niche overlap among Cyanophyta species was comparatively higher, Microcystis aeruginosa had broader niche breadth, but other species showed lower niche breadth. Correlation analysis showed that the dominance of the dominant species in different seasons had significant correlation with their niche breadth, and the dominant species density had significant correlation with their niche overlap.
本文运用修正的Levins公式和Petraitis公式，测定了华东地区淀山湖浮游植物优势种的生态位宽度和生态位重叠，并分析了生态位宽度、生态位重叠与优势种密度和优势度之间的关系。优势种的生态位宽度和生态位重叠在不同时期存在差异，不同优势种对环境因子的适应能力不同。根据不同季节的生态位宽度，可将该湖的优势种分为4类，其中尖尾蓝隐藻和普通小球藻生态位较宽，数量较多，分布较广，对环境资源利用较好。在蓝藻水华期间，蓝藻门物种间的生态位重叠相对较高，铜绿微囊藻生态位宽度较宽，而其他物种生态位宽度较低。相关性分析表明，不同季节优势种的优势度与其生态位宽度显著相关，优势种密度与其生态位重叠显著相关。
