Impact of DOC trends resulting from changing climatic extremes and atmospheric deposition chemistry on periphyton community of a freshwater tropical lake of India

Pandey, Usha; Pandey, Jitendra

doi:10.1007/s10533-012-9747-7

Cited by 22 publications

(20 citation statements)

References 37 publications

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“…The increases have been observed in acid sensitive rivers and lakes and appear to be present in both waters that already had a relatively high DOC concentration and waters that initially had a low DOC concentration ( Evans et al, 2005 ). Data on long-term DOC trends in other parts of the world is scarce, but increasing DOC concentrations have also been reported, for example in Lake Jaisamand in India ( Pandey and Pandey, 2012 ) and it has been suggested that DOC concentrations have increased in Lake Paldang in South Korea ( Kang et al, 2010 ). The exact cause of this rise in DOC has not been found, though it has been suggested that an interaction between several mechanisms is responsible ( Sucker and Krause, 2010 ).…”

Section: Co 2 and Doc In Freshwater Ecosystemsmentioning

confidence: 99%

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

2018

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Freshwater ecosystems are confronted with the effects of climate change. One of the major changes is an increased concentration of aquatic carbon. Macrophytes are important in the aquatic carbon cycle and play as primary producers a crucial role in carbon storage in aquatic systems. However, macrophytes are affected by increasing carbon concentrations. The focus of this review lies on dissolved organic carbon (DOC), one of the most abundant forms of carbon in aquatic ecosystems which has many effects on macrophytes. DOC concentrations are rising; the exact cause of this increase is not known, although it is hypothesized that climate change is one of the drivers. The quality of DOC is also changing; for example, in urban areas DOC composition is different from the composition in natural watersheds, resulting in DOC that is more resistant to photo-degradation. Plants can benefit from DOC as it attenuates UV-B radiation, it binds potentially harmful heavy metals and provides CO2 as it breaks down. Yet plant growth can also be impaired under high DOC concentrations, especially by humic substances (HS). HS turn the water brown and attenuate light, which limits macrophyte photosynthesis at greater depths. This leads to lower macrophyte abundance and lower species diversity. HS form a wide class of chemicals with many different functional groups and they therefore have the ability to interfere with many biochemical processes that occur in freshwater organisms. Few studies have looked into the direct effects of HS on macrophytes, but there is evidence that HS can interfere with photosynthesis by entering macrophyte cells and causing damage. DOC can also affect reactivity of heavy metals, water and sediment chemistry. This indirectly affects macrophytes too, so they are exposed to multiple stressors that may have contradictive effects. Finally, macrophytes can affect DOC quality and quantity as they produce DOC themselves and provide a substrate to heterotrophic bacteria that degrade DOC. Because macrophytes take a key position in the aquatic ecosystem, it is essential to understand to what extent DOC quantity and quality in surface water are changing and how this will affect macrophyte growth and species diversity in the future.

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Section: Co 2 and Doc In Freshwater Ecosystemsmentioning

confidence: 99%

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

2018

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“…Many of the major sources of nitrogen emissions can be regulated via technological means, and for this reason, nitrogen deposition rates are dropping over much of the industrialized world and recovery from acid deposition in these regions already underway [Driscoll et al, 2003;Kopáček et al, 2006]. In contrast, P emissions to the atmosphere result from land use and climate changes that influence the wind erosion of soils, increases in food production, use of grazing lands, and changes in the frequency and severity of droughts that influence biomass burning [Foley et al, 2005;Hudson, 2011;Pandey and Pandey, 2013;Trenberth et al, 2014]. Though N deposition is decreasing in the industrialized world, N deposition continues to rise in other parts of the developing world [Galloway et al, 2004;Pandey et al, 2014;Wilcke et al, 2013].…”

Section: 1002/2015gb005137mentioning

confidence: 99%

Is atmospheric phosphorus pollution altering global alpine Lake stoichiometry?

Brahney

Mahowald

Ward

et al. 2015

Global Biogeochemical Cycles

151

133

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Anthropogenic activities have significantly altered atmospheric chemistry and changed the global mobility of key macronutrients. Here we show that contemporary global patterns in nitrogen (N) and phosphorus (P) emissions drive large hemispheric variation in precipitation chemistry. These global patterns of nutrient emission and deposition (N:P) are in turn closely reflected in the water chemistry of naturally oligotrophic lakes (r 2 = 0.81, p < 0.0001). Observed increases in anthropogenic N deposition play a role in nutrient concentrations (r 2 = 0.20, p < 0.05); however, atmospheric deposition of P appears to be major contributor to this pattern (r 2 = 0.65, p < 0.0001). Atmospheric simulations indicate a global increase in P deposition by 1.4 times the preindustrial rate largely due to increased dust and biomass burning emissions. Although changes in the mass flux of global P deposition are smaller than for N, the impacts on primary productivity may be greater because, on average, one unit of increased P deposition has 16 times the influence of one unit of N deposition. These stoichiometric considerations, combined with the evidence presented here, suggest that increases in P deposition may be a major driver of alpine Lake trophic status, particularly in the Southern Hemisphere. These results underscore the need for the broader scientific community to consider the impact of atmospheric phosphorus deposition on the water quality of naturally oligotrophic lakes.

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“…In many parts of India, current AD-N inputs (Pandey & Pandey, 2009, 2013Pandey, Pandey, & Singh, 2014a) are high enough to influence the structure and functioning of terrestrial (Clark & Tilman, 2008;Sase et al, 2019) and aquatic ecosystems (Bergström, Jonsson, & Jansson, 2008;Pandey et al, 2014aPandey et al, , 2014b. Tropical aquatic ecosystems, where light and temperature regimes generally remain optimal are more prone to such nutrient inputs (Pandey & Pandey, 2013). The AD-nutrients delivered directly on water surfaces enhance phytoplankton development (Bergström et al, 2008) while those added into the catchment may enhance terrestrial carbon and nutrient supply through land surface runoff (Pandey et al, 2014a) and the coupled effect of these alter the structure and function of receiving ecosystems (Clark & Tilman, 2008;Pandey & Pandey, 2013;Pandey et al, 2014aPandey et al, , 2014bSuárez & Gebauer, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Tropical aquatic ecosystems, where light and temperature regimes generally remain optimal are more prone to such nutrient inputs (Pandey & Pandey, 2013). The AD-nutrients delivered directly on water surfaces enhance phytoplankton development (Bergström et al, 2008) while those added into the catchment may enhance terrestrial carbon and nutrient supply through land surface runoff (Pandey et al, 2014a) and the coupled effect of these alter the structure and function of receiving ecosystems (Clark & Tilman, 2008;Pandey & Pandey, 2013;Pandey et al, 2014aPandey et al, , 2014bSuárez & Gebauer, 2019). The thresholds of these critical transitions, however, generally remain unnoticed until surprising shifts occur.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric deposition and land-surface runoff driven nutrient flushing in Ganga River (India)

Pandey

Singh

et al. 2020

Water Science

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Disproportionate addition of nutrients can alter the nutrient stoichiometric balance of surface water bodies. In the present study, we investigated the atmospheric deposition (AD) and runoff-induced nutrient enrichment and N:P stoichiometric shifts in the Ganga River along a 35 km stretch of Varanasi city. The region receives 8-42 kg ha −1 of reactive-N (NO 3 − + NH 4 +) and 0.40-3.10 kg ha −1 of PO 4 3through AD annually. The most polluted Rajghat Site receives ~770.50 tons of reactive-N (Nr) and ~64.50 tons of PO 4 3annually as AD input in the subwatershed; and ~25.10 tons of Nr and 2.09 tons of PO 4 3directly on the water surface. Concentrations of nutrients in surface runoff increased with AD input irrespective of land use. Among land use categories, the runoff nitrate was highest from agricultural catchment while NH 4 + and PO 4 3were highest from urban areas. The study showed that the AD-runoff coupled with additional supplies could substantially alter the overall load and stoichiometric ratios of critical nutrients with a consequent effect on ecological functioning of the river in long-run.

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Impact of DOC trends resulting from changing climatic extremes and atmospheric deposition chemistry on periphyton community of a freshwater tropical lake of India

Cited by 22 publications

References 37 publications

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

Is atmospheric phosphorus pollution altering global alpine Lake stoichiometry?

Atmospheric deposition and land-surface runoff driven nutrient flushing in Ganga River (India)

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