Hydrological fluctuations modulate phototrophic responses to nutrient fertilization in a large and shallow lake of Southwest China

Hu, Kui; Chen, Guangjie; Gregory‐Eaves, Irene; Huang, Linpei; Chen, Xiaolin; Liu, Yuanyuan; Leavitt, Peter R.

doi:10.1007/s00027-019-0633-4

Cited by 10 publications

(9 citation statements)

References 76 publications

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“…The area belongs to the north subtropical drying monsoon and mid-tropical humid monsoon climate with distinct dry and wet seasons, with high precipitation in summer. In the region, the annual average precipitation is about 928.3 mm, the average value of annual sunshine hours is 2300 h and the average air temperature is around 18 • C [20]. The lake never freezes.…”

Section: Study Area and Data Acquisitionmentioning

confidence: 99%

“…To determine regime shifts using response variables, and to explore the potential drivers, the first step was to establish the conceptual stressor-response relationships in Lake Yilong. Previous studies showed that external nutrient loads are definitely the fundamental drivers (stressors) across the years, while other human activities (e.g., fish/aquaculture) and hydrological factors also had great effects at different periods [20,35]. With increasing loads from the watershed, the concentrations of TN and TP increased and subsequently caused a high level of algal biomass; the corresponding negative effects were high turbidity, low SD and the vanishing of submerged macrophytes.…”

Section: Determination Of Regime Shift Presencementioning

confidence: 99%

“…The concentrations of TN and TP in the lake were high and enough to support algal growth, which suggests that the nutrient conditions for a regime shift were fully met. In terms of the meteorological and hydrological conditions, since 1976, when the Qingyuwan Tunnel was built, the water level of Lake Yilong has been regulated artificially, but the lake dried up in 1981 and almost dried up in 2013 [20,42]. From 1989 to 2008, except for a gradual warming trend and a decreasing trend of wind speed, there were no extreme (inter-annual) changes in precipitation, as well as the lake area; though the annual precipitation decreased significantly from 2008 to 2009, the changes of the lake area and water depth were small [20].…”

Section: Driving Forces For the Regime Shiftsmentioning

confidence: 99%

“…Lake Yilong is one of the most eutrophic lakes in China. Although there is a high possibility that this lake has undergone regime shifts one or more times [18][19][20], the lack of knowledge on regime shifts and their drivers has severely impeded decision-making regarding lake ecosystem management. In this lake, the nutrients have exhibited enrichment since the 1960s; the water quality and the aquatic community varied a lot in the last few decades [18][19][20][21], and fish culture is an important income source for the local residents.…”

Section: Introductionmentioning

confidence: 99%

“…Although there is a high possibility that this lake has undergone regime shifts one or more times [18][19][20], the lack of knowledge on regime shifts and their drivers has severely impeded decision-making regarding lake ecosystem management. In this lake, the nutrients have exhibited enrichment since the 1960s; the water quality and the aquatic community varied a lot in the last few decades [18][19][20][21], and fish culture is an important income source for the local residents. In addition to nutrient input from the watershed, exotic fish introduction or changes of fish culture strategy may also have an impact on water quality, the food web and even cause regime shift, as has been revealed in other lakes [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Identification of Regime Shifts and Their Potential Drivers in the Shallow Eutrophic Lake Yilong, Southwest China

Zhao

Wang²,

Liang³

et al. 2020

Sustainability

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Regime shifts in shallow lakes can lead to great changes in ecosystem structures and functions, making ecosystem management more complicated. Lake Yilong, located in Yunnan Province, is one of the most eutrophic lakes in China. Although there is a high possibility that this lake has undergone regime shift one or more times, the presence of regime shifts and their drivers remain unknown. Here, we employed the sequential t-test analysis of regime shifts to detect the regime shifts based on the long-term (1989–2018) dataset of the lake. We further determined their potential drivers, and explored the nutrient thresholds of regime shifts and hysteresis. The results showed that during the testing period, three regime shifts occurred in 1996 (restorative type), 2009 (catastrophic type) and 2014 (restorative type). The potential key drivers for the first two regime shifts (1996 and 2009) were both related to aquaculture. The abolition of cage fish culture may have led to the restorative regime shift in 1996, and the stocking of crabs and excessive premature releasing of fry possibly caused the catastrophic regime shift in 2009. However, the third regime shift, which occurred in 2014, was possibly related to the drought and succedent hydration. These results indicate that adjustments of aquaculture strategy and hydrological conditions are critical for the lake ecosystem’s recovery. Moreover, the total phosphorus thresholds were identified to be lower than 0.046 mg/L (restorative type) and higher than 0.105 mg/L (catastrophic type), respectively. In addition, an obvious hysteresis was observed after 2014, suggesting that nutrient reduction is important for this lake’s management in the future.

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Section: Study Area and Data Acquisitionmentioning

confidence: 99%

Section: Determination Of Regime Shift Presencementioning

confidence: 99%

Section: Driving Forces For the Regime Shiftsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Identification of Regime Shifts and Their Potential Drivers in the Shallow Eutrophic Lake Yilong, Southwest China

Zhao

Wang²,

Liang³

et al. 2020

Sustainability

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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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Multiproxy paleolimnological records provide evidence for a shift to a new ecosystem state in the Northern Great Plains, USA

Mushet

Sweetman

2022

Limnology & Oceanography

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Wetlands in the Prairie Pothole Region of the North American Northern Great Plains perform multiple ecosystem services and are biodiversity hotspots. However, climatological changes can result in sudden shifts in these important ecosystems. For example, marked increases in precipitation in the last few decades have resulted in a widespread shift in wetlands across the Prairie Pothole Region to a new ecohydrological state. We used multiproxy analyses (diatom community composition and invertebrate stable isotopes) of 210Pb‐dated sediment cores from two adjacent, but morphologically and hydrologically different, prairie‐pothole wetlands to assess the effects of hydroclimatic variability on these wetland ecosystems. Our results provide evidence that the recent ecohydrological shift in the region's wetlands is unprecedented over the past ca. 178 yr. Oxygen stable isotopes in chironomid head capsules provide a record of paleohydrology changes. The most recent sediments (i.e., those deposited after the state shift) from both wetlands revealed novel changes in diatom communities that differed greatly from earlier community compositions. In addition, a depleted signal in deuterium and 13C carbon stable isotopes observed in chironomid head capsules and Daphnia ephippia, respectively, after 1993 is likely related to an increase in methane production in these wetlands. Our study highlights the importance of considering basin morphometry including whether a wetland has an overflow point, and multiple biological indicators to study climate‐change influences on freshwater ecosystems. Research using these techniques can lead to an improved understanding of recent ecosystem shifts, an understanding that will be essential for future climate‐change adaptation and mitigation in this ecologically important region.

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Hydrological fluctuations modulate phototrophic responses to nutrient fertilization in a large and shallow lake of Southwest China

Abstract: Hydrological fluctuations modulate phototrophic responses to nutrient fertilization in a large and shallow lake of Southwest China. Aquatic Sciences, 81(2), [37].

Cited by 10 publications

References 76 publications

Identification of Regime Shifts and Their Potential Drivers in the Shallow Eutrophic Lake Yilong, Southwest China

Identification of Regime Shifts and Their Potential Drivers in the Shallow Eutrophic Lake Yilong, Southwest China

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

Multiproxy paleolimnological records provide evidence for a shift to a new ecosystem state in the Northern Great Plains, USA

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