Twentieth century human and climate impacts on a large mountain lake in southwest China

Xinchun, Guo; Potito, Aaron P.; Luo, Lin; Beilman, David W.

doi:10.1007/s10750-013-1615-5

Cited by 14 publications

(9 citation statements)

References 57 publications

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“…As increased temperature and agricultural inputs can both result in higher lake productivity and lowered dissolved oxygen levels, they can display similar signatures within chironomid communities (Davidson and Jeppesen 2013;Guo et al 2013). However, the differentiated effects of temperature and catchment agricultural cover are apparent in the partial RDAs and ordination bi-plots.…”

Section: Inference Modelmentioning

confidence: 99%

“…Three of these sites appear to be overestimating July temperature due to agricultural activity within the catchments. As greater temperatures and agricultural inputs can both lead to increased lake productivity (Davidson and Jeppesen 2013), they can exhibit similar effects on chironomid communities (Guo et al 2013). CE5, DL1 and G8 contain 99.9, 75.0 and 100 % agricultural catchment cover, respectively, and all contain cows within their catchments.…”

Section: Inference Modelmentioning

confidence: 99%

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Modern influences on chironomid distribution in western Ireland: potential for palaeoenvironmental reconstruction

et al. 2014

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Ireland provides a unique setting for the study of past climates, as its climate is dominated by westerly airflow from the North Atlantic and readily responsive to changes in North Atlantic circulation patterns. Although there has been substantial research on Ireland's past environments, quantitative palaeolimnological research, especially chironomid-based research, has been lacking. In order to further develop chironomid-based palaeolimnological investigations, a calibration set was constructed to determine the dominant environmental controls on modern chironomids in western Ireland. Chironomid subfossils were collected from surface sediments of 50 lakes. The lakes were characterised with 36 environmental variables, including physical attributes, lake water characteristics, lake sediment characteristics and land cover within each catchment. In this exploratory study, no specific environmental variable was targeted and lakes were chosen to span gradients of latitude, elevation, depth and trophic status. Redundancy analysis showed that six environmental variablesmean July air temperature, lake depth, dissolved organic carbon, and percentage catchment land cover of agriculture, peat bog and scrubland-captured a large and statistically significant portion of the variance in the chironomid data. July temperature and agricultural land cover were the most dominant environmental variables, with July temperature proving the most suitable for inference model development. A classical weighted-averaging model was developed to estimate July air temperature, with a coefficient of determination (r jack 2 ) of 0.60 and root mean square error of prediction (RMSEP) of 0.57°C. Results suggest that summer temperature is the dominant influence on chironomid distribution across a wide variety of lake types, and the relatively small RMSEP should allow for more accurate reconstructions of Ireland's relatively subdued Holocene temperature fluctuations.

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Section: Inference Modelmentioning

confidence: 99%

Section: Inference Modelmentioning

confidence: 99%

Modern influences on chironomid distribution in western Ireland: potential for palaeoenvironmental reconstruction

et al. 2014

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“…Time series analysis of lake records has been pivotal in extending long-term climate records, while allowing for a more intricate understanding of the potential effects of modern climate change on lake ecology (Smol and Cumming, 2008). A number of studies have attempted to separate the climate signal from anthropogenically induced pressures on lakes with mixed success (Dong et al, 2012;Thies et al, 2012;Guo et al, 2013). Jeppesen et al (2014) suggest the use of historical climate data and palaeo-techniques to assess the impacts of local drivers versus regional climate influences.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their worldwide distribution and abundance, lifecycle characteristics and mobility, as well as their sensitivity to changes in limnological conditions, chironomids have been an effective tool in reconstructing recent temperature change (Porinchu et al, 2007;Guo et al, 2013). However, studies that have employed chironomids to reconstruct recent climate change have tended to focus on regions situated in either high latitudes or high altitudes, as these areas tend to show a strong response to recent warming (Axford et al, 2009;Porinchu et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Assessing recent climatic and human influences on chironomid communities from two moderately impacted lakes in western Ireland

McKeown

Potito

2015

Hydrobiologia

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This study assessed the influences of climate warming and human impacts on Irish lakes over the late nineteenth to early twenty-first centuries. High-resolution chironomid (Insecta: Diptera) stratigraphies were developed for two low-to mid-elevation lakes in northwest Ireland to determine if lakes with mild-to-moderate human impacts can be used to accurately reconstruct mean July air temperature. Application of an Ireland-based chironomid-inference model to quantitatively estimate July air temperature (r 2 jack = 0.60, RMSEP = 0.57°C) revealed that chironomids can reflect changes in Irish temperature, particularly post-1980 when warming accelerated, although this signal becomes compromised with intensified human impacts. A biotic response to nutrient enrichment and soil erosion from direct human activities was identified through a comparison of chironomid autecology with known catchment changes. Redundancy analysis and time series comparisons were used to identify when faunal turnover is a function of local (nutrient input, erosion) versus extra-regional (climate) drivers over the recent past, and identify any thresholds of human influence within the catchments. This study highlights the importance of careful site selection as moderately impacted sites do not follow a simple scheme, as well as multi-proxy analysis to assess catchment-based human activity for longer term chironomid-based temperature reconstructions in Ireland.

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“…Nevertheless, some anthropogenic activities around the lake could change the local environmental conditions, including increased agriculture since 1940s, large-scale deforestation in 1970s and 1980s and tourism growth since 1990s (Zhang et al, 2013;Guo et al, 2013). Deforestation is generally associated with erosion, which increases both sediment and nutrient load in the lake (O'Reilly et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Long-chain n-alkenes in recent sediment of Lake Lugu (SW China) and their ecological implications

Zhang

Liu

et al. 2015

Limnologica

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a b s t r a c tLong-chain n-alkenes showing a predominance of n-C 25:1 and n-C 27:1 were detected in recent sediment of Lake Lugu, an oligotrophic alpine lake in Yunnan Province, SW China. The abundances of n-C 25:1 and n-C 27:1 alkenes varied considerably in the sediment core, most obviously in showing higher values during the period of 1821-1982, followed by a significant decrease between 1982 and 2012. Such variations were similar to those of long-chain 1,15-alkyl diols, biomarkers of eustigmatophytes, and a significant correlation was observed between n-C 25:1 (or n-C 27:1 ) alkene and C 32 1,15-alkyl diol in the sediment core. This correlation and the fact that long-chain n-alkenes in some eustigmatophytes (e.g., Nannochloropsis sp.) were dominated by C 25 and C 27 compounds indicates that eustigmatophytes were the most likely contributor of the long-chain n-alkenes (especially the n-C 25:1 and n-C 27:1 alkenes) in Lake Lugu sediment. Chlorophytes, on the other hand, cannot be excluded as a possible contributor of the long-chain n-alkenes because these algae are common in Lake Lugu and they are known to biosynthesize n-C 27:1 alkene. Productivities for some species of eustigmatophytes and chlorophytes considerably decreased when the lake water was heavily influenced by catchment soil erosion and anthropogenic sewage inputs.

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Twentieth century human and climate impacts on a large mountain lake in southwest China

Cited by 14 publications

References 57 publications

Modern influences on chironomid distribution in western Ireland: potential for palaeoenvironmental reconstruction

Modern influences on chironomid distribution in western Ireland: potential for palaeoenvironmental reconstruction

Assessing recent climatic and human influences on chironomid communities from two moderately impacted lakes in western Ireland

Long-chain n-alkenes in recent sediment of Lake Lugu (SW China) and their ecological implications

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