Impact of barrages on assemblage pattern of phytoplankton in tropical river Ganga, India.

Autor: Kumar J; ICAR-Central Inland Fisheries Research Institute 24, Panna Lal Road, Allahabad-211002, Uttar Pradesh, India. jeetendrak142@gmail.com., Alam A; ICAR-Central Inland Fisheries Research Institute 24, Panna Lal Road, Allahabad-211002, Uttar Pradesh, India., Jha DN; ICAR-Central Inland Fisheries Research Institute 24, Panna Lal Road, Allahabad-211002, Uttar Pradesh, India., Gogoi P; ICAR-Central Inland Fisheries Research Institute, CGO Complex, (2nd floor, C-Wing), DF Block, Salt Lake, Kolkata, 700064, West Bengal, India., Borah S; ICAR-Central Inland Fisheries Research Institute Regional Center, HOUSEFEED Complex, Dispur (Last Gate), Guwahati, 781006, Assam, India., Das BK; ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata, 700120, West Bengal, India.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2022 Sep 19; Vol. 194 (11), pp. 804. Date of Electronic Publication: 2022 Sep 19.
DOI: 10.1007/s10661-022-10484-z
Abstrakt: The occurrence, abundance, and distribution of phytoplankton have been investigated upstream and downstream of three barrages on the river Ganga at Bijnor, Narora, and Kanpur in Uttar Pradesh, India. A total of 104 phytoplankton species belonging to eight phyla (Bacillariophyta, Charophyta, Chlorophyta, Cryptophyta, Cyanophyta, Euglenophyta, Miozoa, and Ochrophyta) were identified during the sampling period. During the summer, monsoon, and post-monsoon seasons, the density of phytoplankton (Ind. L -1 ) ranged from 9.6 × 10 4 to 2.03 × 10 7 , 9.6 × 10 4 to 4.5 × 10 5 , and 2.2 × 10 5 to 2.17 × 10 6 , respectively. The species abundance and the relative abundance showed an increasing trend from the first (Bijnor) to the third (Kanpur) barrage, suggesting a gradual decrease in river flow and an increase in residence time. Phytoplankton cell density in Kanpur, however, was unexpectedly higher and showed eutrophic conditions attributable to elevated organic load and surplus nutrients from the land runoff. One-way ANOVA (post-hoc Tukey test) showed statistically significant (p < 0.05) seasonal variation in temperature, transparency, free CO 2 , PO 4 3- , and dissolved organic matter. Analysis of Pearson's correlation coefficient suggested a statistically significant correlation (p < 0.05) of mostly phytoplanktonic groups with free CO 2 , CO 3 2- , HCO 3 - , Cl - , specific conductivity, total dissolved solids, total hardness, Mg 2+ , PO 4 3- , and SiO 4 4- . The minimum species diversity was recorded during the monsoon season, while the maximum diversity was reported during the post-monsoon season which might be due to high nutrient load and a high concentration of PO 4 3- post-monsoon. We concluded that aquatic biodiversity and ecological structure could be adversely influenced by a series of obstructed barrages and dams, which influenced the assemblage pattern of phytoplankton communities.
(© 2022. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
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