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Pandey, Usha
- The Skewed N : P Stoichiometry Resulting from Changing Atmospheric Deposition Chemistry Drives the Pattern of Ecological Nutrient Limitation in the Ganges
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PDF Views:96
Authors
Affiliations
1 Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Mahatma Gandhi Kashividyapith University, Varanasi 221 002, IN
1 Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Mahatma Gandhi Kashividyapith University, Varanasi 221 002, IN
Source
Current Science, Vol 107, No 6 (2014), Pagination: 956-958Abstract
No Abstract.Full Text
- Anthropogenic Drivers Shift Diatom Dominance–Diversity Relationships and Transparent Exopolymeric Particles Production in River Ganga:Implication for Natural Cleaning of River Water
Abstract Views :235 |
PDF Views:74
Authors
Affiliations
1 Department of Botany, Mahatma Gandhi Kashi Vidyapith, Varanasi 221 002, IN
2 Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, IN
3 Department of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, IN
1 Department of Botany, Mahatma Gandhi Kashi Vidyapith, Varanasi 221 002, IN
2 Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, IN
3 Department of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, IN
Source
Current Science, Vol 113, No 05 (2017), Pagination: 959-964Abstract
We studied the relationships among diatom biodiversity,transparent exopolymeric particles (TEP) and water quality at the confluences of four tributaries of River Ganga (Yamuna, Assi, Varuna and Gomti)during low flow. Diatom abundance changed with concurrent shifts in water chemistry with dominance–diversity curves markedly skewed from a log-normal pattern. Canonical correspondence analysis segregated chloride-loving and calcifilous species from N- and P-favoured taxa. Despite pollution-induced reduction of diatom diversity, TEP production continued to rise plausibly due to dominance transference of TEP producers. However, with further increase in nutrient pollution, TEP declined. Since TEP enhances sedimentation removal of carbon, nutrients and heavy metals, the present study confirms one of the fundamental mechanisms that underline the self-purification capacity of River Ganga and has relevance from a biodiversity/river conservation perspective.Keywords
Anthropogenic Drivers, Carbon Sequestration, Diatoms, Transparent Exopolymeric Particles.Full Text
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- Point Source-Driven Seasonal Hypoxia Signals Habitat Fragmentation and Ecosystem Change in River Ganga
Abstract Views :359 |
PDF Views:88
Authors
Affiliations
1 Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Mahatma Gandhi Kashividyapith University, Varanasi 221 002, IN
1 Ganga River Ecology Research Laboratory, Environmental Science Division, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Botany, Mahatma Gandhi Kashividyapith University, Varanasi 221 002, IN
Source
Current Science, Vol 117, No 12 (2019), Pagination: 1947-1949Abstract
The development of dissolved oxygen deficit (DOD; hypoxia) has been reported to expand over 2.45 × 105 km2 area of the ocean from over 400 different areas worldwide1. Although cultural eutrophication has greatly accelerated DOD in estuaries and semi-enclosed seas2,3, it is not a common phenomenon in large rivers4. Hydrological continuum reinforces oxygenation, and therefore, development of hypoxia (dissolved oxygen (DO) < 2.0 mg l–1) is less critical in large rivers. River ecosystems usually respond to gradual changes in a smooth manner. However, smooth and continuous changes can be interrupted by sudden abrupt switches to a mosaic of alternative states leading to loss of resilience5. Such shifts are most often driven externally, for instance, point source flushing, but they can trigger internal feedbacks leading the system to behave chaostically even in the absence of external forcing6.Full Text
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