Assessment of Primary Productivity of Kiri Reservoir, Adamawa, Nigeria

Abstract

Primary productivity is a fundamental ecological concept that quantifies the rate of organic matter production through photosynthesis  per unit area in aquatic environments, reflecting the foundational energy conversion in biological systems. This study was conducted in  Kiri Reservoir, Shelleng Local Government Area of Adamawa State, Nigeria. This study investigated the primary productivity dynamics of  the reservoir by conducting a comprehensive spatial and temporal analysis. Water samples were systematically collected from four  strategic sampling locations (inflow, outflow, and mid-reservoir positions) over a four-month period from October 2023 to February 2024,  with statistical analysis performed using ANOVA to evaluate productivity variations. The samples were used to assess the gross primary  productivity, net primary productivity, and community respiration. Gross primary productivity ranged from 0.108±0.004gCm-3h^-1 to  0.126±0.02gCm-3h^-1, Net primary productivity ranged from 0.059±0.05gCm-3h^-1 to 0.067 gCm-3h^-1 ±0.004 gCm-3h^-1 and Community  respiration ranged from 0.043±0.003 gCm-3h^-1 to 0.047±0.005 gCm-3h^-1. The research findings indicate that the Kiri Reservior  demonstrates characteristics of high to moderate productivity, substantiated by a substantial organic material synthesis rate