An extreme drought event homogenises the diatom composition of two shallow lakes in southwest China

Klamt, Anna Marie; Hu, Kui; Huang, Linpei; Chen, Xiaolin; Liu, Xiaolong; Chen, Guangjie

doi:10.1016/j.ecolind.2019.105662

Cited by 19 publications

(9 citation statements)

References 79 publications

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“…In addition, the year 2009 witnessed severe droughts in sub-regions 2, 4, 6, and 7, which were observed from SPI, SSI, and SRI. This agreed well with the southwestern severe droughts from 2009-2012 [64][65][66]. Overall, the drought conditions differed for dry and wet areas.…”

Section: Temporal Variations Over 1948-2010supporting

confidence: 81%

National-Scale Variation and Propagation Characteristics of Meteorological, Agricultural, and Hydrological Droughts in China

Yao

Zhao

et al. 2020

Remote Sensing

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The regional and national scales variation and propagation characteristics of different types of droughts are critical for improving drought resilience, while information is limited in China. The objective of this research was to investigate the evolution and propagation characteristics of three types of droughts using standardized indices at multi-timescales in different sub-regions of China. The indices included Standardized Precipitation/Soil Moisture/Runoff Index (SPI/SSI/SRI) using the optimal probability density function, representing meteorological, agricultural, and hydrological droughts based on precipitation, soil water storage, and baseflow-groundwater runoff, respectively. Wavelet analysis was used to reveal their periodical characteristics. Modified Mann-Kendall trend test was used to compare the trend among drought indices. Correlation coefficients between SPI and SSI/SRI were calculated to identify the time-lags of SPI with SSI and SRI. In general, droughts indicated by SPI agreed well with the historical drought events at different sub-regions. The main periods of SSI were closer to SPI than SRI, indicating stronger connections of agricultural drought with meteorological drought. A weaker connection between meteorological and agricultural/hydrological droughts at shorter timescales was observed in northwestern arid and semi-arid regions. The propagation from meteorological to agricultural or hydrological droughts were well denoted by the lagged time (months) from SPI to SSI or SRI at a timescale ranged from 0 (mostly located in south China) to 5 months (mostly located in northeastern China) for 1-, 3-, 6-, 12-, or 24-month timescale; this was a new finding for China. The methods of wavelet combining trend test and Pearson coefficient showed meaningful power for revealing the drought propagation characteristics and the obtained results can be a good reference for other regions of the world since this study compared different climate zones from arid to humid conditions. The study provides crucial information and guidance to develop drought management strategies at regional to national scale and their critical time of action.

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Section: Temporal Variations Over 1948-2010supporting

confidence: 81%

National-Scale Variation and Propagation Characteristics of Meteorological, Agricultural, and Hydrological Droughts in China

Yao

Zhao

et al. 2020

Remote Sensing

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“…In Central and Southern China, a large number of vegetation deaths were caused by freezing disasters in 2008 [53]. In Southwest China, extreme drought events between 2009 and 2013 significantly reduced lake diatom diversity [54]. In 2018, temperature and precipitation anomalies led to changes in NDVI (Normalized Difference Vegetation Index) in the Yangtze River Basin [55].…”

Section: Increasing Threat Of Extreme Eventsmentioning

confidence: 99%

Response of Biodiversity, Ecosystems, and Ecosystem Services to Climate Change in China: A Review

2021

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Climate change is having a significant impact on the global ecosystem and is likely to become increasingly important as this phenomenon intensifies. Numerous studies in climate change impacts on biodiversity, ecosystems, and ecosystem services in China have been published in recent decades. However, a comprehensive review of the topic is needed to provide an improved understanding of the history and driving mechanisms of environmental changes within the region. Here we review the evidence for changes in climate and the peer-reviewed literature that assesses climate change impacts on biodiversity, ecosystem, and ecosystem services at a China scale. Our main conclusions are as follows. (1) Most of the evidence shows that climate change (the increasing extreme events) is affecting the change of productivity, species interactions, and biological invasions, especially in the agro-pastoral transition zone and fragile ecological area in Northern China. (2) The individuals and populations respond to climate change through changes in behavior, functions, and geographic scope. (3) The impact of climate change on most types of services (provisioning, regulating, supporting, and cultural) in China is mainly negative and brings threats and challenges to human well-being and natural resource management, therefore, requiring costly societal adjustments. In general, although great progress has been made, the management strategies still need to be further improved. Integrating climate change into ecosystem services assessment and natural resource management is still a major challenge. Moving forward, it is necessary to evaluate and research the effectiveness of typical demonstration cases, which will contribute to better scientific management of natural resources in China and the world.

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“…As in real systems exposed to drying, our tiles and leaf packs were above the waterline for portions of the experiment, and these results coincide with previous examinations of drought systems. Previous field [ 32 , 33 , 70 ] and mesocosm [ 52 , 57 ] studies have shown that drought can negatively affect algal communities [ 71 , 72 ]. Additionally, drought can negatively impact macroinvertebrate taxa [ 30 , 73 ], cause a decrease in the autotrophic index as photosynthetic components of the periphyton die [ 52 ], and slow the decomposition of leaf litter [ 52 , 71 ].…”

Section: Discussionmentioning

confidence: 99%

Drought and nutrient pollution produce multiple interactive effects in stream ecosystems

Fournier

Magoulick²

2022

PLoS ONE

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Drought and nutrient pollution can affect the dynamics of stream ecosystems in diverse ways. While the individual effects of both stressors are broadly examined in the literature, we still know relatively little about if and how these stressors interact. Here, we performed a mesocosm experiment that explores the compounded effects of seasonal drought via water withdrawals and nutrient pollution (1.0 mg/L of N and 0.1 mg/L of P) on a subset of Ozark stream community fauna and ecosystem processes. We observed biological responses to individual stressors as well as both synergistic and antagonistic stressor interactions. We found that drying negatively affected periphyton assemblages, macroinvertebrate colonization, and leaf litter decomposition in shallow habitats. However, in deep habitats, drought-based increases in fish density caused trophic cascades that released algal communities from grazing pressures; while nutrient enrichment caused bottom-up cascades that influenced periphyton variables and crayfish growth rates. Finally, the combined effects of drought and nutrient enrichment interacted antagonistically to increase survival in longear sunfish; and stressors acted synergistically on grazers causing a trophic cascade that increased periphyton variables. Because stressors can directly and indirectly impact biota—and that the same stressor pairing can act differentially on various portions of the community simultaneously—our broad understanding of individual stressors might not adequately inform our knowledge of multi-stressor systems.

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An extreme drought event homogenises the diatom composition of two shallow lakes in southwest China

Cited by 19 publications

References 79 publications

National-Scale Variation and Propagation Characteristics of Meteorological, Agricultural, and Hydrological Droughts in China

National-Scale Variation and Propagation Characteristics of Meteorological, Agricultural, and Hydrological Droughts in China

Response of Biodiversity, Ecosystems, and Ecosystem Services to Climate Change in China: A Review

Drought and nutrient pollution produce multiple interactive effects in stream ecosystems

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