Zhu Yuxuan, Tu Xiaojie, Bi Yonghong, Song Gaofei, Mi Wujuan
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Hubei Key Laboratory of Resources and Eco-Environment Geology (Hubei Geological Bureau), Wuhan 430034, China.
Plants (Basel). 2024 Jul 26;13(15):2067. doi: 10.3390/plants13152067.
Periphytic algal colonization is common in aquatic systems, but its interspecific competition remains poorly understood. In order to fill the gap, the process of periphytic algal colonization in the Middle Route of the South to North Water Diversion Project was studied. The results showed that the process was divided into three stages: the initial colonization stage (T1, 3-6 days), community formation stage (T2, 12-18 days) and primary succession stage (T3, 24-27 days). In T1, the dominant species were (Bory), (Kützing) and (Lange-Bertalot) belonging to Heterokontophyta; these species boasted wide niche widths (NWs), low niche overlap (NO) and low ecological response rates (ERRs). In T2, the dominant species were , (Kützing), , , (Kützing), (C.Agardh), (N.L.Gardner) and (Kuntze). These species displayed wider NWs, lower NO, and lower ERRs than those in T1. In T3, the dominant species were , , , , (Grunow), etc. Among them, Heterokontophyta such as and had a competitive advantage based on NWs and ERRs. Cyanobacteria like lost their dominant status due to the narrower NW and the increased NO. It could be concluded the interspecific competition became fiercer and shaped the colonization process; this study will be helpful in understanding the colonization of periphytic algal communities.
附生藻类定殖在水生系统中很常见，但其种间竞争仍知之甚少。为了填补这一空白，对南水北调中线工程中的附生藻类定殖过程进行了研究。结果表明，该过程分为三个阶段：初始定殖阶段（T1，3 - 6天）、群落形成阶段（T2，12 - 18天）和初级演替阶段（T3，24 - 27天）。在T1阶段，优势种为属于不等鞭毛类的（博里）、（屈茨ing）和（兰格 - 贝塔洛特）；这些物种具有较宽的生态位宽度（NWs）、较低的生态位重叠（NO）和较低的生态响应率（ERRs）。在T2阶段，优势种为、（屈茨ing）、、、（屈茨ing）、（C.阿加德）、（N.L.加德纳）和（昆茨）。这些物种比T1阶段的物种表现出更宽的NWs、更低的NO和更低的ERRs。在T3阶段，优势种为、、、、（格鲁诺夫）等。其中，基于NWs和ERRs，诸如和等不等鞭毛类具有竞争优势。像这样的蓝细菌由于生态位宽度变窄和NO增加而失去了优势地位。可以得出结论，种间竞争变得更加激烈并塑造了定殖过程；这项研究将有助于理解附生藻类群落的定殖。
