Quantification and visualization of the variability of phytoplankton assemblage in a semi-lotic seasonal Canal in Sundarbans, India

Sinha, Archana and Gogoi, Pranab and Tayung, Tasso and Sarkar, S D and Lohith Kumar, K and Mitra, Arunava and Suresh, V V R and Das, B K (2021) Quantification and visualization of the variability of phytoplankton assemblage in a semi-lotic seasonal Canal in Sundarbans, India. Journal of the Indian Society of Coastal Agricultural Research, 36 (2). pp. 206-220. ISSN 0972-1584

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Abstract

Canals of Sundarbans in India are highly vulnerable to anthropogenic pressures which directly or indirectly impact the biological components of such ecosystems. Being at the base of the trophic pyramid, phytoplankton is exposed to environmental stressors and the impact will be reflected in the upper strata of the aquatic food chain. Hence, phytoplankton communities along with their interrelationship with environmental parameters were assessed in Bhetkimari canal, a semi-lotic system in Indian Sundarbans during June 2017 to September 2018. Seventy-seven species under 66 genera were recorded with Cyanophyceae (34%) as a major contributor, followed by Bacillariophyceae (31%) and Chlorophyceae (22%). Diatoms dominated round the year in terms of diversity (25 species) with maximum contribution from Pennales. ANOVA (post-hoc test) showed significant temporal heterogeneity (p≤0.05) in phytoplankton distribution in the canal. The Margalef richness index (d) and Shannon-Weiner diversity index (H′) were 2.59±0.43 and 2.26±0.59, respectively indicating that the environment is good and phytoplankton diversity in the system is moderate. Water temperature, dissolved oxygen, total alkalinity and nutrients (nitrate, silicate and phosphate) were the explanatory variables in shaping the phytoplankton assemblages in the canal, which was evident from Canonical correspondence analysis. The salient findings of this study can add to the existing knowledge on the abundance and di

Item Type:	Article
Uncontrolled Keywords:	Assemblages; Canal; Indian Sundarbans; Phytoplankton; Physicochemical
Subjects:	Marine Biology > Phytoplankton
Divisions:	CMFRI-Kochi > Mariculture Division Subject Area > CMFRI > CMFRI-Kochi > Mariculture Division CMFRI-Kochi > Mariculture Division Subject Area > CMFRI-Kochi > Mariculture Division
Depositing User:	Arun Surendran
Date Deposited:	30 Jan 2023 06:57
Last Modified:	30 Jan 2023 06:57
URI:	http://eprints.cmfri.org.in/id/eprint/16660

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