[Characteristics of Phytoplankton Community Structure in Lakes of Wetlands Dominated by Different Aquatic Plants and Its Driving Factors].

Q2 Environmental Science
Yu-Xin Li, Song-Qi Yang, Qi-Yan Ye, Kai-Ming Wan, Yu-Ting Deng, Teng Zhao, Pei-Chang Dong, Ling Zhou, Jin-Na Wang, Zhong-Xing Wu
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引用次数: 0

Abstract

In wetland ecosystems, small shallow lakes are critical transition zones of land and water, which are usually dominated by aquatic plants with different growth forms. However, the differences and key influencing factors of phytoplankton communities in shallow lakes dominated by different aquatic plants are unclear. On this basis, nine surveys were conducted at five sampling sites of three lakes in Zhangye National Wetland Park from June to November in 2022, which were respectively dominated by the emergent Phragmites australis (LL), the submerged Potamogeton perfoliatus (CL), and the floating-leaved Nymphaea tetragona (SL). During the study period, the three lakes showed obvious habitat differences. A total of 237 species of phytoplankton in seven phyla and 93 genera were identified in the three lakes, including 189 species, 151 species, and 147 species in the LL, CL, and SL lakes, respectively. Among them, Ulnaria acus, Scenedesmus quadricauda, Achnanthidium minutissimum, Nitzschia stagnorum, Navicula radiosa, and Gymnodinium aeruginosum were shared dominant species of all three lakes, indicating that they had strong environmental adaptability, whereas Navicula lanceolala, Encyonopsis cesatii, and Eunotia diodon and Cymbella aequalis were only dominant in the CL, LL, and SL lakes, respectively. Simultaneously, these dominant algae appeared with obviously distinct statuses of niche width, niche overlap, and interspecific correlation among the three lakes. Using principal coordinate analysis (PCoA) and permutational multivariate analysis of variance (PERMANOVA), significant differences were found in algal community composition among the three lakes (P<0.001). Multiple regression on (dis)similarity matrices analysis (MRM) showed that the heterogeneity of phytoplankton communities among the three lakes was positively affected by NO3--N and pH and negatively affected by dissolved oxygen (DO) and was closely positively correlated with the abundance of six dominant species, namely, S. quadricauda, U. acus, N. stagnorum, Pseudoanabaena sp., Merismopedia punctata, and A. minutissimum. These results indicate that aquatic plants with different growth types could affect the composition, structure, and stability of phytoplankton communities in the same habitat with them by shaping their habitat heterogeneity. Therefore, selecting specific growth types of aquatic plants for aquatic ecosystem restoration in wetland construction and management will be conducive to regulate the state of water habitat and phytoplankton community structure effectively.

[以不同水生植物为主的湿地湖泊浮游植物群落结构特征及其驱动因素]。
在湿地生态系统中,小型浅水湖泊是水陆过渡的关键地带,通常以生长形态各异的水生植物为主。然而,以不同水生植物为主的浅水湖泊中浮游植物群落的差异和主要影响因素尚不清楚。在此基础上,研究人员于2022年6月至11月在张掖国家湿地公园的3个湖泊的5个取样点进行了9次调查,这3个湖泊分别以挺水植物Phragmites australis(LL)、沉水植物Potamogeton perfoliatus(CL)和浮叶植物Nymphaea tetragona(SL)为主。在研究期间,三个湖泊呈现出明显的生境差异。三个湖泊共发现浮游植物 7 门 93 属 237 种,其中长湖、中湖和南湖分别为 189 种、151 种和 147 种。其中,Unnaria acus、Scenedesmus quadricauda、Achnanthidium minutissimum、Nitzschia stagnorum、Navicula radiosa和Gymnodinium aeruginosum是三个湖泊共有的优势种,表明它们具有较强的环境适应能力,而Navicula lanceolala、Encyonopsis cesatii和Eunotia diodon和Cymbella aequalis则分别只在CL、LL和SL湖泊中占优势。同时,这些优势藻类在三个湖泊中的生态位宽度、生态位重叠和种间相关性也有明显差异。利用主坐标分析(PCoA)P3--N和pH值存在显著差异,并受溶解氧(DO)的负影响。与六种优势物种的丰度密切正相关,这六种优势物种分别是:S. quadricauda、U. acus、N. stagnorum、Pseudoanabaena sp.、Merismopedia punctata 和 A. minutissimum。这些结果表明,不同生长类型的水生植物可通过塑造生境异质性来影响与它们处于同一生境的浮游植物群落的组成、结构和稳定性。因此,在湿地建设和管理中选择特定生长类型的水生植物进行水生生态系统修复,将有利于有效调节水域生境状态和浮游植物群落结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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