| 冰封期乌梁素海浮游植物生态位和种间联结性分析 |
| Ecological Niche and Interspecific Association of Phytoplankton during the Ice-on Period of Ulansuhai Lake |
| 投稿时间：2021-09-17 修订日期：2023-05-23 |
| DOI：10.15928/j.1674-3075.202109170330 |
| 中文关键词:浮游植物 优势种 生态位 种间联结性 乌梁素海 |
| 英文关键词:phytoplankton dominant species niche interspecific association Ulansuhai Lake |
| 基金项目:国家自然科学基金(42067037，41701281)；内蒙古“一湖两海”科技重大专项(ZDZX2018054) |
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| 中文摘要: |
| 为了解乌梁素海冰封期浮游植物群落结构和生态位特征，于2018年和2019年冬季（1月）进行浮游植物采样调查。根据乌梁素海污染源分布、水文及环境特征，在湖泊入水口（N1~N6）、湖泊中部（N7~N14）和湖泊出水口（N15、N16）选取了16个典型样点，进行浮游植物和水样采集；运用改进的Levins公式和Petraitis指数测定浮游植物优势种的生态位宽度和生态位重叠度。结果表明，2018年和2019年冰封期共鉴定出浮游植物优势种2门6种和6门8种，伪鱼腥藻是2018年的绝对优势种，2019年的绝对优势种为蓝隐藻和旋转囊裸藻。2018年冰封期优势种生态位宽度为0.0711~0.5971，宽度最大的为球衣藻，其次是绿柄球藻和衣藻；2019年冰封期优势种生态位宽度为0.1265~0.5455，宽度最大的为绿柄球藻，其次是具尾逗隐藻和蓝隐藻。2018 年和2019年乌梁素海冰封期各优势种的生态位重叠值分别为0.0078~0.7967 和0.0448~0.9248，整体上重叠值小；2018年冰封期浮游植物优势种绿藻门的衣藻与球衣藻的重叠值最高，2019年隐藻门的具尾逗隐藻与蓝隐藻的重叠值最高。生态位重叠度和生态响应速率显示，2018年乌梁素海冰封期浮游植物群落整体上呈发展趋势，而2019年呈衰退趋势。方差比率法分析显示，优势种整体呈正关联；卡方检验发现，各优势种间的联结性均不显著，大多数藻类种间为负关联，少数为正关联。 |
| 英文摘要: |
| In this study, we explored the phytoplankton community structure and ecological niche characteristics of Ulansuhai Lake during the ice-on period and analyzed interspecific associations of phytoplankton based on theoretical conceptions of ecological niche breadth and overlap. Our objective was to provide basic data to support nutrient evaluation and pollution treatment of the lake. Based on the distribution of pollution sources, hydrology and environmental characteristics of Ulansuhai Lake, 16 representative sites were selected, including the inlet (N1-N6), open area (N7-N14) and outlet (N15, N16) of the lake for sampling phytoplankton and water in January (winter) of 2018 and 2019. The Improved Levins formula and Petraitis Index were used to determine niche breadth and niche overlap of dominant phytoplankton species. A total of 99 phytoplankton species from 7 phyla were identified during the two investigations, with 57 species from 7 phyla in 2018 and 63 species from 7 phyla in 2019. Among them, six species from two phyla in 2018 and 8 species from 6 phyla in 2019 were dominant during the ice-on period, with the absolute dominance by Pseudoanabaena sp. in 2018 and the absolute dominance by Chroomonas sp. and Trachelomonas volvocina in 2019. The niche width of the dominant species in the ice-on period was 0.0711-0.5971 in 2018, and Chlamydomonas globosa had the largest niche width, followed by Stylosphaeridium stipitatum and Chlamydomonas sp. In 2019, the niche width of the dominant species was in the range of 0.1265-0.5455, and Stylosphaeridium stipitatum had the largest niche width, followed by Komma caudata and Chroomonas sp.. In 2018 and 2019, the niche overlap values of the dominant species were 0.0078-0.7967 and 0.0448-0.9248, respectively, and the niche overlap values were generally small. The overlap degree of Chlamydomonas sp. and Chlamydomonas globosa was highest in 2018, and the overlap degree of Komma caudata and Chroomonas sp. was highest in 2019. The overlap of ecological niches and the rate of ecological response indicates that phytoplankton community showed an overall developing trend in 2018 and a declining trend in 2019. The analysis of the variance ratio method showed that, overall, the dominant species were positively correlated. The chi-square test indicated that the association between dominant species was not significant, and most algae species were negatively correlated, with a few species displaying positive correlations. |
| 林 岩,丁晓宇,吕 航,卢兴顺,李 佳,赵子闻,武琳慧.2023.冰封期乌梁素海浮游植物生态位和种间联结性分析[J].水生态学杂志,44(3):102-109. |
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