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Multivariate approach to link phytoplankton dynamics to environmental variations in a large tropical reservoir

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Abstract

The diversity and dynamics of phytoplankton are dependent on many environmental variables in an ecosystem. Their distribution, sudden surge in population, and the mere disappearance provide an indication of the ecology. Hence, the seasonal and spatial variations in phytoplankton diversity and abundance were investigated and correlated with abiotic variables for 2 years (2017–2018 and 2018–2019) in a large tropical reservoir in India, the Mettur reservoir. Plankton abundance was spatially similar with Cyanophyceae as the dominant class. The plankton density showed a 10-fold change ranging from 2.2 × 105 cells/liter during premonsoon to 2.3 × 106 cells/liter during post-monsoon season. The diversity index ranged from 1.202 (post-monsoon) to 2.057 (monsoon season). The reservoir recorded high organic pollution as evidenced by the estimated algal genus pollution index (AGPI). This may be attributed to anthropogenic activities, especially agricultural runoff from catchment areas or inflow of wastewater from the small-scale industries situated in the vicinity of the reservoir. Possible relationships of environmental variables in the ecosystem functioning with phytoplankton community composition were also derived. The outcomes of the present investigation can be extrapolated to other tropical aquatic ecosystems for assessing the ecological quality and the health status of water bodies for implementing efficient management practices for enhanced fish production, especially from underutilized reservoirs.

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Abbreviations

N:

North

E:

East

ha:

Hectare

no.:

Number

%:

Percentage

v/v:

Volume/volume

mg/L:

Milligram per liter

PAST:

PAleontological STatistics

°C:

Degree Celsius

Sp. Cond:

Specific conductivity

m:

Meter

μS/cm:

Micro seimens per centimeter

μg/L:

Microgram per liter

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Acknowledgements

The work was supported by the Indian Council of Agricultural Research (ICAR) through an institute project fund. The employees of the ICAR-CIFRI, Bangalore Research Center, and the Tamilnadu state Fisheries Department provided continuous assistance to the authors throughout this study, for which we are grateful.

Funding

This work was supported by Indian Council of Agricultural Research.

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Authors and Affiliations

Authors

Contributions

All authors were involved in conceptualization of the present work. Methodology and investigation: Ramya V. L., Ajoy Saha, Jesna P. K., Sibinamol Salim; formal analysis and writing—original draft: Jesna P. K.; data curation: Karthikeyan M., Vijaykumar M. E., writing—review and editing: Preetha Panikkar, Sarkar U. K; supervision, project administration: Das, B. K. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Jesna Parakkandi.

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Conflict of interest

The authors declare no conflict of interest.

Additional information

Responsible Editor: Broder J. Merkel

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Parakkandi, J., Ramya, V.L., Saha, A. et al. Multivariate approach to link phytoplankton dynamics to environmental variations in a large tropical reservoir. Arab J Geosci 16, 490 (2023). https://doi.org/10.1007/s12517-023-11596-7

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  • DOI: https://doi.org/10.1007/s12517-023-11596-7

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