| 摘要: |
| 浮游植物作为水生态系统的初级生产者,反映了水体的生态结构和功能状态。干旱湖泊水体循环结构多变,浮游植物群落对环境变化尤为敏感。本研究于2019年5月(春季)、7月(夏季)和10月(秋季)对新疆乌伦古湖进行了浮游植物群落结构及演替特征的调查,在28个采样点共鉴定出浮游植物7门73属161种,其中春季、夏季和秋季分别检出85种、49种和149种。微小四角藻(Tetra?dron minimum)为三季的共同优势种,春季以湖生卵囊藻(Oocystis lacustis)和尖针杆藻(Synedra acus)为绝对优势,夏季则为水华束丝藻(Aphanizomenon flos-aquae)和马索卵囊藻(Oocystis marssonii),秋季优势种为环离浮鞘丝藻(Planktolyngbya circumcreta)和水华束丝藻。种间联结特征显示,春秋季的优势种呈显著正联结,而夏季则呈显著负联结。浮游植物多样性表现为春季>秋季>夏季。非度量多维尺度分析(NMDS)和置换多元方差分析(PERMANOVA)结果表明,不同季节的藻类群落组成存在显著差异(P < 0.001)。多元回归分析(MRM)显示,水温(WT)、透明度(SD)和硝酸盐氮(NO- 3-N)对群落异质性有正向影响,而高锰酸盐指数(CODMn)则为负向影响。此外,群落结构与马索卵囊藻、微小四角藻、微囊藻(Microcystis sp.)和角星鼓藻(Staurastrum sp.)的丰度密切相关。总之,乌伦古湖的浮游植物群落在季节性环境变化和种间相互作用的影响下表现出稳定的演替模式。本研究为干旱湖泊浮游植物的环境响应及种间关联性提供了重要的生态学依据。 |
| 关键词: 浮游植物 群落结构 优势度 种间联结 乌伦古湖 |
| DOI： |
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| Response and Succession Mechanisms of Phytoplankton Communities to Seasonal Environmental Changes in Lake Ulungur |
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ZHAO Wei, PU Wenmiao, Sheng Xuran, SONG Dan, WANG Le, HUO Tangbin, DU Xue
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Key Laboratory of Aquatic Organism Protection and Ecological Restoration in Cold Waters,Heilongjiang River Fisheries Research Institute,Chinese Academy of Fishery Sciences
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| Abstract: |
| Phytoplankton, as primary producers in aquatic ecosystems, reflect the ecological structure and functional status of water bodies. The water circulation structure of arid lakes is highly variable, making phytoplankton communities particularly sensitive to environmental changes. This study investigated the structure and succession characteristics of phytoplankton communities in Lake Ulungur, Xinjiang, in May (spring), July (summer), and October (autumn) of 2019. A total of 161 phytoplankton species from 73 genera and 7 phyla were identified across 28 sampling sites, with 85, 49, and 149 species detected in spring, summer, and autumn, respectively. Tetra?dron minimum was the dominant species common to all three seasons. The absolute dominant species in spring were Oocystis lacustis and Synedra acus, while Aphanizomenon flos-aquae and Oocystis marssonii dominated in summer, and Planktolyngbya circumcreta and Aphanizomenon flos-aquae dominated in autumn. The interspecies association characteristics showed significant positive associations among dominant species in spring and autumn, while significant negative associations were observed in summer. Phytoplankton diversity was highest in spring, followed by autumn and summer. Non-metric multidimensional scaling (NMDS) and permutational multivariate analysis of variance (PERMANOVA) indicated significant differences in phytoplankton community composition across the three seasons (P < 0.001). Multiple regression on distance matrices (MRM) analysis revealed that water temperature (WT), transparency (SD), and nitrate nitrogen (NO- 3-N) positively influenced community heterogeneity, while the permanganate index (CODMn) had a negative effect. Additionally, the community structure was closely related to the abundance of Oocystis marssonii, Tetra?dron minimum, Microcystis sp., and Staurastrum sp. Overall, the phytoplankton community in Lake Ulungur exhibited stable succession patterns under the influence of seasonal environmental changes and interspecies interactions. This study provides essential ecological insights into the response of phytoplankton in arid lakes to environmental factors and interspecies relationships. |
| Key words: phytoplankton community structure dominance interspecies associations Lake Ulungur |
