Periodic inundations drive community assembly of amphibious plants in floodplain lakes
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PRIMARY RESEARCH PAPER
Periodic inundations drive community assembly of amphibious plants in floodplain lakes Xueqin Liu
. Saibo Yuan . Hongzhu Wang
Received: 19 April 2020 / Revised: 26 August 2020 / Accepted: 30 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract 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% speciesrich communities (species richness C 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. Keywords Environmental filtering Functional trait Hydrological regime Lakeshore Randomness
Handling editor: Andre´ Padial
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04401-z) contains supplementary material, which is available to authorized users.
A central issue in community ecology is to understand the mechanisms governing the assembly of biological communities in various environmental contexts (Chesson, 2000; Chase, 2003). It is generally recognized that community assembly is driven by deterministic processes as well as stochastic processes (Chase & Myers, 2011; Fitzgerald et al., 2017; Maren et al., 2018). The deterministic perspective is based on niche concepts, focusing on processes related to biotic interactions (e.g., limiting similarity) or abiotic
X. Liu (&) S. Yuan H. Wang State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China e-mail: [email protected] S. Yuan Wuhan City Flood Control Survey and Design Institute Limited Company, Wuhan 430014, China
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Hydrobiologia
environments (e.g., environmental filtering) (Chesson, 2000; Kraft et al., 2015). In contrast, the stochastic perspective is associated with demographic stochasticity and dispersal limitation (Hubbell,
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