Organic geochemical record of increased productivity in Lake Naukuchiyatal, Kumaun Himalayas, India

Choudhary, Preetam; Routh, Joyanto; Chakrapani, G. J.

doi:10.1007/s12665-009-0221-3

Cited by 29 publications

(13 citation statements)

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“…Their fragile ecosystem must maintain the state of environmental equilibrium with the existing surroundings particularly from a special prospective of human encroachment and pollution. However, in recent decades, population growth, agricultural practices and sewage runoff from urban areas have increased nutrient inputs many folds to the level of their natural occurrence, resulting in accelerated eutrophication (Choudhary et al 2010;Zan et al 2010). The lakes and reservoirs, all over India without exception, are in varying degrees of environmental degradation, might be due to encroachments, eutrophication (from domestic and industrial effluents) and silt.…”

Section: Introductionmentioning

confidence: 99%

Water quality index to determine the surface water quality of Sankey tank and Mallathahalli lake, Bangalore urban district, Karnataka, India

2013

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Section: Introductionmentioning

confidence: 99%

Water quality index to determine the surface water quality of Sankey tank and Mallathahalli lake, Bangalore urban district, Karnataka, India

2013

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“…Because low molecular weight n-alkanes dominate the hydrocarbon composition of most aquatic algae (i.e. both diatoms and green algae) and photosynthetic bacteria (Choudhary et al 2010), the increase in these compounds, combined with low diatom productivity, as indicated by low BSi values, could reflect dominance of cyanobacteria and green algae during most of the turbid state. The temporary increase in DAR, suggesting increased dominance of diatoms around 1977 (Fig.…”

Section: Discussionmentioning

confidence: 99%

Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake

et al. 2014

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In this study, we demonstrate that an integrated approach, combining palaeolimnological records and limnological monitoring data, can increase our understanding of changing ecological patterns and processes in shallow lakes. We focused on recent regime shifts in shallow Lake Krankesjön, southern Sweden, including the collapse of the clearwater state in 1975 and its subsequent recovery in the late 1980s. We used diatom, hydrocarbon and biogenic silica sediment records, in concert with limnological data sets on nutrient concentrations, water clarity, chlorophyll-a and water depth, to investigate the shifts. The shift from clear to turbid conditions was abrupt and occurred over 1 to 2 years, whereas recovery of the clear-water state was more gradual, taking 4-5 years. In 1978, shortly after the first regime shift in water clarity, the diatom community underwent a significant shift. It became less diverse, with decreased abundance of epiphytic and planktonic taxa. Despite rising phosphorus concentrations and lower abundance of submerged macrophytes, Lake Krankesjön has remained in the clear-water state over the past 20 years, although this state seems to be increasingly unstable and susceptible to collapse. The complex reactions of the entire lake ecosystem to major changes in lake-water clarity, as shown by the Paleolimnol (2014) 51:437-448 DOI 10.1007 palaeolimnological variables investigated in this study, emphasize the importance of careful lake and catchment management if a stable, clear-water state is desired.

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“…Lastly, Lop Lake presents a good example of changes to water flow and water area, whereby the overall trend is that lakes shrink and even dry up to disappear as they evolve to later stages. Under natural conditions, the lake aging process develops slowly; however, with the development of social economy in many areas, the evolution and disappearance of lakes have been greatly accelerated (Katsuki et al, 2009;Choudhary et al, 2010;Kabir et al, 2011;Zan et al, 2012). Similar to aging people, in the process of lake development, when a lake becomes old, it will attempt to maintain its previous level of function but never has exactly the same biological and chemical components and concentrations.…”

Section: T Zhang Et Al: Dianchi Lake In Southwest Chinamentioning

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Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

Zhang

Zeng

Wang

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Temporal and spatial changes to the water quality of Dianchi Lake in southwest China were investigated using monthly monitoring data from 2005 to 2012. Dianchi Lake is divided into two parts, Caohai Lake and Waihai Lake, by a man-made dike. Caohai Lake lies at the north of Dianchi Lake, while Waihai Lake is the main water body of Dianchi Lake and accounts for 96.7 % of the whole area of the lake. Based on the analysis of total phosphorus (TP), total nitrogen (TN), and chlorophyll a (Chl a) concentrations, it was determined that, in Caohai Lake, the annual concentrations of these variables ranged from 0.19-1.46 mg L −1 , 6.11-16.79 mg L −1 , 0.06-0.14 mg L −1 , respectively. In addition, the annual concentrations of TP, TN and Chl a in Waihai Lake ranged between 0.13 and 0.20 mg L −1 , 1.82 and 3.01 mg L −1 , and 0.04 and 0.09 mg L −1 , respectively. Cluster analysis (CA) classified the 10 monitoring sites into two clusters (cluster A and cluster B) based on similarities of water quality characteristics. Our data revealed that the current status of water quality within Caohai Lake was much worse than that of Waihai Lake. Water quality was seriously degraded during the economic boom near the period of the "Eleventh Five-Year Plan" (2005)(2006)(2007)(2008)(2009)(2010), and gradually improved from 2010 to 2012 because of the "standard emission directive to industry". The main factors that influenced the spatial and temporal changes to water quality were natural factors including lake evolution and regional characteristic as well as human factors such as pollution load into the lake and management strategies that were already adopted. Some activities and regulations were implemented to enhance the lake environment by controlling wastewater emissions and establishing regulations to protect the lakes in the Yunnan Province. However, problems with institutional fragmentation (horizontal and vertical), simple treatment methods, low-intensity investment in pollution control, and lack of meaningful endogenous pollution control strategies were still present in the lake management strategy. To solve these problems, suitable control measures are needed, especially considering the current old-age status of Dianchi Lake. The fundamental improvement of the water quality within Caohai Lake was dependent on the measures taken in the upper reaches of the Caohai Watershed, including further recovery of submerged plants, resource utilization by floating plants and the reinforcement of sediment disposal. Management strategies for endogenous pollution in Waihai Lake were mainly dependent on restocking algae-eating fish and the ecological restoration of macrophytes. In this way, the swamping trend and the ageing process that is occurring in Dianchi Lake can be stunted. And the management strategies would be a contribution to the management of water conflicts between mankind and ecosystems in similar lakes.

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Organic geochemical record of increased productivity in Lake Naukuchiyatal, Kumaun Himalayas, India

Cited by 29 publications

References 40 publications

Water quality index to determine the surface water quality of Sankey tank and Mallathahalli lake, Bangalore urban district, Karnataka, India

Water quality index to determine the surface water quality of Sankey tank and Mallathahalli lake, Bangalore urban district, Karnataka, India

Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake

Temporal and spatial changes of water quality and management strategies of Dianchi Lake in southwest China

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