城市湿地水生植物对附生轮虫多样性的影响

于2021年6~10月对海珠湿地连通水系水区及三类水生植物体表附生的轮虫群落结构开展研究,分析水生植物附生轮虫多样性及群落动态特征.研究期间共记录轮虫70种,其中水生植物水区最多,记录47种.水生植物均有大量轮虫附生,变化范围在108~5826ind./gdw之间,且附生轮虫丰度呈现沉水植物>浮叶植物>挺水植物的变化趋势.水生植物附生群落、无植物水区和水生植物栽培区3种生境轮虫群落物种组成差异明显.水生植物附生群落中游动能力较弱的腔轮虫、镜轮虫、鞍甲轮虫等敏感类群占据优势,而无水生植物区和水生植物水区群落中以游泳能力较强的多肢轮属、龟纹轮属和臂尾轮属等耐污类群占据优势.3类型水生植物附生轮虫群落Shannon-Weiner多样性指数与Pielou’s均匀性指数均显著高于无植物栽培水区(P<0.05).3类水生植物均为轮虫提供了生境支持,有效提高城市湿地生态系统生物多样性.

Effects of macrophytes on epiphytic rotifer species diversity in urban wetlands

This study investigated the community structure of rotifers living epiphytically on three types of macrophytes and in the pelagic zone within the connected water system of Haizhu National Wetland Park from June to October, 2021. The rotifer species diversity and the community dynamics of epiphytic rotifers on macrophytes were analysed. A total of 70 rotifer species were recorded during the study period. The highest number of taxa occurred in macrophyte zone (47). Abundant rotifers were attached to the surface of macrophytes, ranging from 108 to 5826 ind./gdw. The abundance of epiphytic rotifers decreased in the trend: submerged plants > floating leaf plants > emergent plants. The rotifer communities were significantly different among the non-macrophyte zone, the macrophyte zone and the three types of macrophytes. The surface of macrophytes were dominated by sensitive genera with weak swimming ability, such as Lecane, Testudinella and Lepadella. While macrophyte zone and non-macrophyte zone communities were dominated by genera with strong swimming ability such as Polyarthra as well as pollution-tolerant genera such as Anuraeopsis and Brachionus. In addition, the Shannon-Weiner diversity index and the Pielou’s evenness index of the three macrophyte epiphytic rotifer communities were significantly higher than those in the non-macrophyte zone (P<0.05). All three types of the macrophytes provide habitat support for rotifers and effectively improve the biodiversity in urban wetland ecosystem.