Understanding the effects of disturbance regimes on community assembly is an essential issue in community ecology. Yet, little is known about how water regimes drive community assembly considering functional facets in aquatic communities. We detected functional trait patterns of amphibious plant communities and checked the effects of inundations on these patterns, using null model analyses based on observational data of 20 Yangtze River floodplain lakes. Amphibious plant communities in the study lakes were dominated by perennials and a large proportion (61.2%) of communities were species-poor (species richness < 3). Null model analyses based on both incidence and biomass data showed 95.6% species-rich communities (species richness ≥ 3) presented randomness trait patterns. A higher proportion of randomness was found in the post-flood (98.8%) than pre-flood (89.7%) communities, and randomness tended to be more important as inundation increased. We showed for the first time the effects of periodic inundations on trait patterns of amphibious plants in floodplain lakes. Our results suggested that randomness would be common and important at a fine scale even in highly disturbed habitats. We further put forward a new conceptual framework regarding the underlying assembly mechanisms that water regimes drove aquatic plant communities in river floodplain ecosystems.

中文翻译：

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周期性洪水推动泛滥平原湖泊中两栖植物的群落聚集

了解干扰机制对社区集会的影响是社区生态学中的一个重要问题。然而，考虑到水生群落的功能方面，人们对水制度如何推动群落组装知之甚少。我们检测了两栖植物群落的功能特征模式，并检查了洪水对这些模式的影响，使用基于 20 个长江漫滩湖泊观测数据的零模型分析。研究湖泊中的两栖植物群落以多年生植物为主，大部分（61.2%）的群落物种贫乏（物种丰富度<3）。基于发病率和生物量数据的空模型分析显示，95.6% 的物种丰富群落（物种丰富度≥3）呈现随机性状模式。在洪水后发现了更高比例的随机性 (98. 8%) 比洪水前 (89.7%) 社区，随着洪水的增加，随机性往往更重要。我们首次展示了周期性洪水对泛滥平原湖泊两栖植物性状模式的影响。我们的结果表明，即使在高度干扰的栖息地，随机性在精细尺度上也很普遍和重要。我们进一步提出了一个关于河流泛滥平原生态系统中水体驱动水生植物群落的潜在组装机制的新概念框架。我们的结果表明，即使在高度干扰的栖息地，随机性在精细尺度上也很普遍和重要。我们进一步提出了一个新的概念框架，关于水制度驱动河流泛滥平原生态系统中水生植物群落的潜在组装机制。我们的结果表明，即使在高度干扰的栖息地，随机性在精细尺度上也很普遍和重要。我们进一步提出了一个关于河流泛滥平原生态系统中水体驱动水生植物群落的潜在组装机制的新概念框架。