The role of mechanical harvesting on the recession of aquatic vegetation under an extreme water level increase in a eutrophic shallow lake

Yang, Changtao; Nan, Jing; Li, Jianhua; Lin, Yi; Yu, Jie; Wu, Jianbin; Shen, Xiaobing

doi:10.1007/s11356-021-15143-3

Cited by 7 publications

(5 citation statements)

References 58 publications

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“…In China, a motto states that “lucid waters and lush mountains are invaluable assets,” and actions have been taken based on this realization; thus, the restoration of freshwater ecosystems has attracted considerable attention, which has led to important action steps. Maintaining water clarity and a low water level is crucial for aquatic plant restoration (Yang et al, 2021). As shown in the present study, the restoration of high underwater PAR conditions does not suit C. caroliniana .…”

Section: Discussionmentioning

confidence: 99%

Underwater light attenuation inhibits native submerged plants and facilitates the invasive co‐occurring plant Cabomba caroliniana

Huang

Fan

Lü

et al. 2023

Diversity and Distributions

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Aim Decreasing in the diversity and distribution of native submerged plants have been widely observed in recent decades. Global underwater darkening, which is mainly caused by radiation dimming and a decrease in transparency due to, e.g. eutrophication, has emerged as a general trend that strongly hampers the growth of submerged plants in lakes by decreasing the light available for photosynthesis. However, few studies have attempted to compare the responses of native and invasive submerged plants to underwater darkening. In this study, we aimed to compare the effects of light attenuation on the growth and photosynthesis traits of native and invasive submerged plants. Location East China. Method Through field investigations and a mesocosm experiment, the responses of functional traits of two representative native [water thyme (Hydrilla verticillata), Eurasian watermilfoil (Myriophyllum spicatum)] and one invasive [Carolina fanwort (Cabomba caroliniana)] plant species to various environmental factors, notably to underwater light attenuation, were studied. Results Underwater photosynthetically active radiation (PAR) exerted a substantial effect on the relative coverage and abundance of the three studied submerged plants in their natural freshwater habitats. Invasive C. caroliniana showed relatively superior growth (total biomass and relative growth rate) and photosynthesis traits (maximum quantum yield of photosystem II Fv/Fm, chlorophyll a content, chlorophyll b content and the ratio of Chl a and b contents) compared to the two native plants under low underwater PAR conditions. In contrast, under high underwater PAR conditions, C. caroliniana showed the opposite response. Main Conclusions Light attenuation inhibits the growth of native submerged plants but facilitates the growth of invasive plant species. Restoration of freshwater lakes by reducing deterioration from underwater darkening (for instance, by reducing of external nutrients loading) may therefore constrain the growth and spread of the invasive C. caroliniana.

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Section: Discussionmentioning

confidence: 99%

Underwater light attenuation inhibits native submerged plants and facilitates the invasive co‐occurring plant Cabomba caroliniana

Huang

Fan

Lü

et al. 2023

Diversity and Distributions

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“…For example, Ghirardi et al (2022) [161] and Xia et al (2022) [162] explored the decade scale of SAV dynamics using remote sensing images, providing a reference area for restoration. The classification accuracy of SAV changed from 60% to nearly 95% in existing studies [158,[163][164][165], which were mainly limited by the resolution of images, water depth, water color, and spectral traits of specific submerged macrophytes [158,166]. With the increase in the resolution of satellite images, the dynamics of specific aquatic macrophyte species can also be interpreted.…”

Section: Remote Sensingmentioning

confidence: 97%

A Bibliometric Analysis of Lake Restoration with Submerged Macrophytes

Gao

2023

Water

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Submerged macrophytes have attracted increasing attention in lake restoration due to the importance of their structuring communities and stabilizing functions in lake ecosystems. However, there is still a lack of systematic reviews on lake restoration with submerged macrophytes. Thus, we performed a systematic review based on a bibliometric analysis via analyzing and visualizing 934 published works from 1996 to 2023 from the Web of Science core collection. Publication characteristics were summarized, and keyword co-occurrence networks, reference co-citation analysis, and keyword burst tests were conducted. Our results suggest that the increasing attention in this field has partly resulted from the many water treatments and scientific schemes in Europe, China, and the USA and extensive international cooperation. The development of this field was divided into three stages based on keyword bursts (e.g., early, turning, and recent stages). Alternative stable states and biomanipulation laid the foundations of this field in the early stage. Progress in the field was discussed based on four aspects, the influence of environmental factors on submerged macrophytes, theory and mechanisms, targets, and evaluation and methods. Therefore, our results provide a new and comprehensive understanding of lake restoration with submerged macrophytes.

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“…Water level changes affect the substrate, nutrients, light, water, and gas, leading to changes in the surface or root microbes of submerged plants and thereby affecting their growth [19,20]. Water level changes have been demonstrated to be an important reason for the extinction of aquatic vegetation in lakes such as Taihu Lake and Chaohu Lake [19,21]. Using structural equation modeling (SEM) in Taihu Lake and Datong Lake, Yang et al and Chao et al confirmed that the SD/WD and the water level were the primary drivers controlling the community composition of the submerged plants and triggered changes in the state of the lake ecosystem [22,23].…”

Section: Introductionmentioning

confidence: 99%

Water Level Fluctuation Rather than Eutrophication Induced the Extinction of Submerged Plants in Guizhou’s Caohai Lake: Implications for Lake Management

Chao,

Jiang,

Wang

et al. 2024

Water

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The intensifying global decline in submerged aquatic lake plants is commonly attributed to lake eutrophication, while other drivers such as water levels are seldom considered. This study focused on the sudden extinction of the submerged plants in Caohai Lake, Guizhou, and employed long-term data and a whole-lake water level manipulation experiment to explore the impacts of nutrients and water level changes on the decline in submerged plants. The results indicated that over the past 40 years, the total nitrogen and ammonia nitrogen in the water did not change significantly, while the total phosphorus showed a significant decreasing trend. In recent years, however, the water level rose. The biomass of submerged plants continuously increased until a sudden large-scale extinction occurred in 2021; chlorophyll a also significantly increased. It is speculated that the large-scale extinction of the submerged plants was caused by water level fluctuations rather than eutrophication. After the restoration of the natural hydrological regime of low water levels in winter and spring and high levels in summer and autumn, the submerged plants gradually recovered, with the biomass increasing to 922.6 g/m2 in 2023. The structural equation modeling indicated that the water depth and bottom light availability were the main drivers for the changes in the submerged plants. However, in lake protection and management, more attention is often paid to controlling nutrients, while other influencing factors are neglected. These findings confirm the importance of water levels in the decline in and restoration of submerged plants in shallow lakes, suggesting a focus on water level management in lake protection and aquatic vegetation restoration.

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The role of mechanical harvesting on the recession of aquatic vegetation under an extreme water level increase in a eutrophic shallow lake

Cited by 7 publications

References 58 publications

Underwater light attenuation inhibits native submerged plants and facilitates the invasive co‐occurring plant Cabomba caroliniana

Underwater light attenuation inhibits native submerged plants and facilitates the invasive co‐occurring plant Cabomba caroliniana

A Bibliometric Analysis of Lake Restoration with Submerged Macrophytes

Water Level Fluctuation Rather than Eutrophication Induced the Extinction of Submerged Plants in Guizhou’s Caohai Lake: Implications for Lake Management

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