Assessing the phytoplankton community and diversity in relation to physico-chemical parameters in a tropical reservoir o
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(2020) 6:110
ORIGINAL ARTICLE
Assessing the phytoplankton community and diversity in relation to physico‑chemical parameters in a tropical reservoir of the River Ganga basin, India Jeetendra Kumar1 · Absar Alam1 · Uttam Kumar Sarkar2 · Basanta Kumar Das2 · Vijay Kumar1 · Saket Kumar Srivastava1 Received: 8 April 2020 / Accepted: 15 October 2020 © Springer Nature Switzerland AG 2020
Abstract Phytoplankton species composition and diversity and its relation to physico-chemical parameters were studied in Jargo Reservoir located on River Jargo, a tributary of River Ganga basin, India. A total of 137 phytoplankton species belonging to 8 divisions were recorded indicating rich phytoplankton diversity in the North Indian reservoir. Bacillariophyta contributed the highest number of species followed by Chlorophyta. Filamentous algae such as Geitlerinema sp., Pseudoanabaena sp., Oscillatoria sp. and Phormidium sp. were highly abundant. The contribution of the top ten species ranged between 63% and 98% of total phytoplankton density. PCA analysis of physico-chemical revealed six principal components ( HCO3, TDS, BOD, DOM, air temperature and pH) which significantly affected the succession of phytoplankton in Jargo Reservoir. The CCA analysis of phytoplankton species and physico-chemical parameters revealed that Ochrophyta and Miozoa were highly influenced by high CO2 and PO4. Higher phytoplankton diversity and species richness were observed during the late winter season and rainy season, respectively. Our investigation recommends that fish production in the reservoir could be enhanced by stocking with fingerlings of silver carp, which has the potential to utilise the unconsumed population of abundant Myxophyta. Keywords Phytoplankton · Diversity indices · Jargo Reservoir · Ecology · CCA · India
Introduction India has a rich reservoir resource of more than 3.51 m ha (CWC 2016; Sarkar et al. 2017 and Sarkar and Mishal 2017). Jargo reservoir was proposed on River Jargo (a tributary of River Ganga) during the first 5-year plan (1951–1956) for the strengthening of the irrigation system of state Uttar Pradesh, India and completely converted the lotic ecosystem to lentic ecosystem. Jargo reservoir is a medium reservoir with an average area of 3108 ha and a catchment area of 40,145 ha. The main sources of water for this reservoir are five seasonal rivers viz; Panchbahini, Kumhiya, Barhai, Maminiya and Jargo. * Uttam Kumar Sarkar [email protected] 1
ICAR-Central Inland Fisheries Research Institute, 24 Panna Lal Road, Allahabad, UP 211002, India
ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata, WB 700120, India
2
Inland open water bodies such as rivers, estuaries, wetlands, and lagoon have undergone environmental degradation due to anthropogenic activities such as industrial pollution, agricultural runoff, domestic sewage, water abstraction and overexploitation (Kuang et al. 2004; Sarkar et al. 2017). Continual degradation of aquatic systems resulted in aconsiderable decline of capture fish
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