Indirect herbivore biomanipulation may halt regime shift from clear to turbid after macrophyte restoration

文献类型： 外文期刊

第一作者： Zhang, Chengxiang

作者： Zhang, Chengxiang;Zhang, Chengxiang;Lu, Cai;Zhang, Xiaobo;Liu, Peizhong;Lei, Guangchun;Pei, Hongcui;Liu, Cunqi;Wang, Wei

作者机构：

关键词： Biomanipulation; Regime shift; Lake ecological restoration; Stoichiometric phosphorus homeostasis

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：9.988； 五年影响因子：10.366 ）

ISSN： 0269-7491

年卷期： 2022 年 313 卷

页码：

收录情况： SCI

摘要： Eutrophication transforms clear water into turbid water in shallow lakes. Current restoration techniques focus on re-establishing the clear-water state rather than on its maintenance. We investigated the response of submerged macrophytes to temporary grass carp (Ctenopharyngodon idella) and scraping snail (Bellamya aeruginosa) in-troductions. We also explored the impacts of herbivores on underwater light conditions to identify their long-and short-term potential to halt regime shift from clear to turbid after clear-water state reestablishment. Herbivores reduced both the biomass of submerged macrophytes and accumulated nutrients in the tissue of submerged macrophytes. This potentially avoided the pulse of endogenous nutrient release which would have exceeded the threshold required for the regime shift from clear to turbid. However, herbivores had a non-significant impact on submerged macrophyte-reduced light attenuation coefficient, which has a positive linear relationship with water chlorophyll a. Further, grass carp and snails enhanced the inhibition ratio of submerged macrophytes to phytoplankton by 3.96 and 2.13 times, respectively. Our study provides novel findings on the potential of herbivore introduction as an indirect biomanipulation tool for halting the regime shift of shallow lakes from clear to turbid after the restoration of submerged macrophytes.

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