Seasonal Dynamics of Primary Productivity in Gobbur Reservoir, Karnataka.

Kanchikeri Sadananda , Nagbhushan Reddy , Vinod Kumar Patil , Shilpa Kalyanrao

Gobbur Reservoir, Primary Productivity, Gross Primary Productivity (GPP), Net Primary Productivity (NPP), Community Respiration (CR).

This study assessed the primary productivity of Gobbur Reservoir in Afzalpur, Kalaburagi District, Karnataka, from January 2024 to December 2024. Gross primary productivity (GPP), net primary productivity (NPP), and community respiration (CR) were measured monthly at four sampling stations using the light-and-dark bottle method. Physico-chemical parameters (temperature, pH, dissolved oxygen, alkalinity, nutrients) were analyzed to evaluate their influence on productivity. The results showed clear seasonal trends: GPP and NPP reached their highest levels in summer (0.65–0.85 gC/m³/hr and 0.40–0.55 gC/m³/hr, respectively) and northeast monsoon periods, whereas their lowest values were observed during the southwest monsoon because of turbid inflows. CR exhibited comparable patterns, showing a strong correlation with dissolved oxygen and temperature. Nutrient ratios (N:P) and morphometric variables (variations in water depth, land use of the catchment) significantly impacted productivity. The reservoir displayed mesotrophic characteristics with moderate productivity, influenced by light access, nutrient contributions from agricultural runoff, and consistent thermal stratification. These results emphasize the susceptibility of Gobbur Reservoir to eutrophication and stress the importance of sustainable land-use methods in its watershed.

Published Paper   E-Certificate

"Seasonal Dynamics of Primary Productivity in Gobbur Reservoir, Karnataka.", IJSDR - International Journal of Scientific Development and Research (www.IJSDR.org), ISSN:2455-2631, Vol.10, Issue 7, page no.a318-a320, July-2025, Available :https://ijsdr.org/papers/IJSDR2507038.pdf

Volume 10 Issue 7, July-2025

Pages : a318-a320

Paper Reg. ID: IJSDR_303991

Published Paper Id: IJSDR2507038

Downloads: 000505

Research Area: Biological Science

Country: Kalaburagi, Karnataka, India

Published Paper PDF: https://ijsdr.org/papers/IJSDR2507038

Published Paper URL: https://ijsdr.org/viewpaperforall?paper=IJSDR2507038

DOI: https://doi.org/10.56975/ijsdr.v10i7.303991

ISSN: 2455-2631 | IMPACT FACTOR: 9.15 Calculated By Google Scholar | ESTD YEAR: 2016

An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 9.15 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator

Publisher: IJSDR(IJ Publication) Janvi Wave

This work is licensed under a Creative Commons Attribution 4.0 International License and The Open Definition