| 中国新记录种卡西双壁藻的形态特征与生境调查 |
| Morphological Characteristics and Habitat of Diploneis calcilacustris: A Newly Recorded Species of Diploneis in China |
| 投稿时间：2021-06-30 修订日期：2023-02-02 |
| DOI：10.15928/j.1674-3075.202106300216 |
| 中文关键词:卡西双壁藻 新记录种 固着硅藻 乌梁素海 |
| 英文关键词:Diploneis calcilacustris newly recorded species periphytic diatom Wuliangsuhai Lake |
| 基金项目:国家自然基金（U1904124）；河南省科技攻关重点项目（202102310028, 202102310272） |
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| 中文摘要: |
| 为探究内蒙古乌梁素海固着硅藻的生物多样性，评价水生态系统健康状态，2020年7月开展了藻类采集与调查工作。调查过程中发现了双壁藻属的一个中国新记录种——卡西双壁藻（Diploneis calcilacustris）；描述了该种的形态特征，分析了乌梁素海水体理化性质和固着硅藻的群落组成。结果表明，卡西双壁藻壳面椭圆形到长椭圆形，两端略呈钝圆形；中央区小，圆形至椭圆形；孔隙粗糙，纵向纹理狭窄；线纹末端有1~2个小孔，与线纹紧密相连，10 μm内有线纹10~12条、孔纹13~15个；壳缝远缝端弯向一侧，近缝端壳缝略扩张。乌梁素海生境指标中，化学需氧量（41.0 mg/L）、总氮（3.2 mg/L）和总磷（0.4 mg/L）含量较高，均属于地表水Ⅴ类标准；根据综合营养指数法评价，TLI(Σ)=72.1>70，乌梁素海为重度富营养化水体。固着硅藻群落结构特征表明，该种所在群落共有固着硅藻89种，其中菱形藻属种类最多，占20.22%，其次为舟形藻，占11.23%；卡西双壁藻为偶见种，丰度占比仅0.4%。该种的发现丰富了中国硅藻种类多样性，可为该属种类的世界地理分布提供新资料。 |
| 英文摘要: |
| Wuliangsuhai Lake is the largest lake in the Yellow River basin and has been?included?in?the?list?of?wetlands?of?international?importance. In July 2020, we conducted a systematic investigation of periphytic diatom biodiversity at five sampling sites in Wuliangsuhai Lake, and simultaneously monitored physiochemical parameters of the lake water. A new diatom species, Diploneis calcilacustris, was collected in Wuliangsuhai Lake during the investigation. The morphology of the new species was characterized, the composition of the periphytic diatom community was analyzed and the water quality of Wuliangsuhai Lake was then evaluated based on the results. We aimed to evaluate the aquatic ecosystem of Wuliangsuhai Lake and provide evidence for the prevention and control of water pollution and conservation of biodiversity. The morphological characteristics of D. calcilacustris were as follows: Valves are elliptic to oblong-elliptical, with rounded ends. The central area is small and the shape is round to oval. Areolae are coarse, and the vertical textures are narrow. Apical internal canals are marked by one or two apertures to the outer valve, located near the transapical striae, with 10-12 10 μm stripes and 13-15 10 μm areolae. The distal raphe fissure is deflected, and the proximal raphe end is slightly expanded. A total of 89 periphytic diatom species from 40 genera and 12 families were identified during the investigation. Dominant species included Nitzschia (18 species), accounting for 20.22% of the total species, followed by Navicula (10 species, 11.23%). The newly identified D. calcilacustris was an occasional species, accounting for 0.4% of the total algae abundance. In terms of water quality, the chemical oxygen demand (COD), total phosphorus (TP) and total nitrogen (TN) in Wuliangsuhai Lake were relatively high with respective values of 41.0 mg/L, 3.2 mg/L and 0.4 mg/L, all meeting Class V surface water standards. The comprehensive trophic index (TLI(Σ)=72.1) of Wuliangsuhai Lake indicated that the water was severely eutrophic (TLI(Σ)>70). This study added to our knowledge periphytic of diatom biodiversity in Wuliangsuhai Lake and provided new information on the global distribution of D. calcilacustris. |
| 吕绪聪,张 曼,董 静,高云霓,王盼盼,刘青娟,李学军.2023.中国新记录种卡西双壁藻的形态特征与生境调查[J].水生态学杂志,44(1):125-130. |
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