Local and Regional Drivers of Environmental Changes in Two Subtropical Montane Ponds (Central China) Over the Last Two Centuries

Chen, Xu; McGowan, Suzanne; Jia, Ping; Zheng, Ting; Bai, Xue; Zeng, Linghan

doi:10.1007/s10021-020-00535-2

Cited by 9 publications

(3 citation statements)

References 53 publications

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“…Even so, this lake zone has probably undergone a transition from a macrophyte‐dominated to algae‐dominated state, with the loss of macrophytes and increase in phytoplankton production driven by cultural eutrophication, elevated lake level, and light limitation (Zhang et al 2016). Third, two lake zones might have responded differently to climate‐related variables (e.g., warming, wind, and extreme weathers) due to their differences in drainage characteristics and ecological regime, as observed in other lake catchments (Maheux et al 2016; Moorhouse et al 2018; Chen et al 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Considering lake‐catchment characteristics and ecological regimes as “filters” of multiple stressors can further improve our understanding of catchment‐scale development and context‐dependent ecological responses (Leavitt et al 2009; Maheux et al 2016; Chen et al 2021). Taihu Lake, the third‐largest freshwater and shallow lake in the most densely populated region of eastern China, provides an ideal model system to study how the interaction of anthropogenic activity and climate change over a variety of spatial scales affects lake water quality and ecosystem functioning.…”

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confidence: 99%

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Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Zhang

McGowan

et al. 2021

Limnology & Oceanography

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Anthropogenic and climatic stressors on freshwater ecosystems are of global concern. However, the interactions and effects of multiple stressors (e.g., nutrient enrichment, climate warming, altered wind and precipitation) acting over different spatial and temporal scales are often complex and remain controversial. Here, we reconstructed one‐century dynamics of eutrophication and primary producer communities in algal‐dominated and macrophyte‐dominated zones of a large shallow lake (Taihu, China), by integrating sedimentary photosynthetic pigments and geochemical records with water monitoring and historical archives. We aimed to explore the long‐term underlying mechanisms of the responses of water quality and lake biota to multiple environmental perturbations. We found that water quality degradation and algal community modification showed similar trends but distinct timings and trajectories in contrasting ecological zones. Onset and intensity of eutrophication in north Meiliang Bay (since the 1950s) exceeded far beyond that of macrophyte‐dominated Eastern Taihu (~1990s). Anthropogenic nutrients overtook past climatic control on production and composition of phototrophic assemblages. More importantly, lake phytoplankton responded markedly to climate warming, decreasing wind speed, and extreme weathers after cultural eutrophication. Synergistic interactions of nutrients and climate on lake ecosystems became increasingly significant in promoting harmful algal blooms (HABs) dominated by Microcystis, close to the hyper‐eutrophic north lake zones. The asynchronous limnological and ecological responses also indicated the modulating roles of lake ecological regime and catchment hydrogeomorphic characteristic. Collectively, our findings suggest that mitigation of eutrophication and HABs calls for a triple management strategy integrating anthropogenic nutrients, climate change, and lake‐catchment setting.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Zhang

McGowan

et al. 2021

Limnology & Oceanography

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“…This explanation is also supported by recent decreases in C/N ratios in both peat cores, which probably resulted from a larger influx of nitrogen from atmospheric deposition. Furthermore, recent evidence from the nearby Congping Basin (10 km away from Dajiuhu Peatland) revealed that changes in primary producers (diatoms) and consumers (chironomids) of two alpine ponds were closely linked to progressive depletion of δ 15 N, an indicator of enhanced nitrogen deposition (Chen et al, 2021; Zheng et al, 2020). Thirdly, the difference might be linked to human disturbances, which have become one major driving force for peatland degradation (Dise, 2009; Joosten et al, 2012; Poulíčková et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Effects of climate change on a subtropical montane peatland over the last two centuries: Evidence from diatom records

et al. 2021

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Climate variability can induce rapid changes in peatland ecosystems, affecting both carbon cycling and vegetation succession. Diatoms are an important group of ubiquitous and diverse algae in peatlands. Until now, the responses of diatom communities to climate variability have rarely been explored in peatlands, especially in subtropical regions. In this study, monitoring and paleolimnological datasets were combined to decipher environmental changes of a subtropical montane peatland (central China) over the last two centuries. Seasonal monitoring data revealed that diatom communities were closely correlated with precipitation, depth to the water table, conductivity, nitrate and temperature. Sedimentary records revealed that temporal changes in diatom assemblages and geochemical elements displayed similar trends in two peat cores after the 1950s. The first gradient in diatom composition represented a shift from Pinnularia species to taxa preferring less-acidic habitats, which was closely linked to climate warming and the enrichment of inorganic elements (e.g. sodium and calcium) since the early 20th century. Meanwhile, changes in diatom communities were further related to precipitation variability, atmospheric deposition and local hydrogeomophic setting. Taken together, the succession of diatom communities was closely linked to climate-regulated availability of nutrients and moisture in this subtropical peatland over the last two centuries. In order to achieve sustainable management of these scarce peatlands, further biological monitoring and paleoecological studies are needed to improve our knowledge of peatland ecosystem evolution in response to future climate change.

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Altitudinal variations in water and sediment composition of 47 lakes in the Three Gorges Reservoir region and its adjacent regions: implications for watershed environmental management

Wang

Jia

et al. 2023

J Soils Sediments

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Local and Regional Drivers of Environmental Changes in Two Subtropical Montane Ponds (Central China) Over the Last Two Centuries

Cited by 9 publications

References 53 publications

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Effects of climate change on a subtropical montane peatland over the last two centuries: Evidence from diatom records

Altitudinal variations in water and sediment composition of 47 lakes in the Three Gorges Reservoir region and its adjacent regions: implications for watershed environmental management

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