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Anthropogenic Drivers Shift Diatom Dominance–Diversity Relationships and Transparent Exopolymeric Particles Production in River Ganga:Implication for Natural Cleaning of River Water


Affiliations
1 Department of Botany, Mahatma Gandhi Kashi Vidyapith, Varanasi 221 002, India
2 Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, India
3 Department of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, India
 

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.
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  • Anthropogenic Drivers Shift Diatom Dominance–Diversity Relationships and Transparent Exopolymeric Particles Production in River Ganga:Implication for Natural Cleaning of River Water

Abstract Views: 396  |  PDF Views: 122

Authors

Usha Pandey
Department of Botany, Mahatma Gandhi Kashi Vidyapith, Varanasi 221 002, India
Jitendra Pandey
Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, India
Anand V. Singh
Environmental Science Division, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, India
Abha Mishra
Department of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, India

Abstract


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.

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DOI: https://doi.org/10.18520/cs%2Fv113%2Fi05%2F959-964