Effects of macrophytes on epiphytic rotifer species diversity in urban wetlands
LIANG Di-wen1, LIU Lu2, HUANG Chun-rong1, YE Zhen1, SUN Shuang-shuang1, XU Rui1, YANG Yu-feng2, DONG Jia-hua1, LIANG Ming-yi1, ZHONG Zhi-qiang1
1. State Environmental Protection Key Laboratory of Urban Ecological Environment Simulation and Protection, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China; 2. Department of Ecology, Jinan University, Guangzhou 510632, China
Abstract: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.
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