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Estimation of primary production along gradients of the middle course of Imo River in Etche, Nigeria

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Author(s): Dike Henry Ogbuagu 1* , Adedolapo Abeke Ayoade 2

Journal: International Journal of Biosciences
ISSN 2220-6655

Volume: 1;
Issue: 4;
Start page: 68;
Date: 2011;
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Keywords: Etche | primary production | oligotrophic | community respiration | phytoplankton

ABSTRACT
Dynamics in spatial yields of primary production in the middle course of the Imo River in Etche, South-eastern Nigeria has been investigated. At seven sampling locations along the course of the river, in situ measurements for water temperature, pH, turbidity, and dissolved oxygen (DO) were made with HORIBA U-10 Water Quality Checker. The light and dark bottle technique was used to measure primary production. Wide variations were observed in turbidity (11.0-279.0, mean = 96.7 ± 9.3 NTU), DO (4.50-8.81, mean = 6.96 ± 0.14mg/l), and sulphate (0.90-8.10, mean = 4.35 ± 0.25mg/l) across the sampling locations. Gross and net primary production (GPP & NPP) as well as community respiration (CR) ranged from 0.10-11.2 (0.9 ± 0.2), 0.1-1.0 (0.4 ± 0.03), and 0.02-0.5 (0.2 ± 0.02) mgO2l-1d-1, respectively. Sampling location 1 showed the highest GPP, NPP, and CR of 0.9, 0.6, and 0.3 mgO2l-1d-1, respectively while location 7 showed the least GPP of 0.6 mgO2l-1d-1, and locations 2-7 the least CR of 0.2mgO2l-1d-1each. At P

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