Journal of Geoscience and Environment Protection

Volume 7, Issue 7 (July 2019)

ISSN Print: 2327-4336   ISSN Online: 2327-4344

Google-based Impact Factor: 0.89  Citations  

Investigating Temperature and Nutrients as Drivers of Primary Productivity in Aquatic Environment

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DOI: 10.4236/gep.2019.77008    445 Downloads   926 Views  Citations


An investigation into the relationship between temperature and the nutrients (,, and ) in pelagial primary productivity of the middle reaches of Otamiri River in Owerri, Southeastern Nigeria was carried out between October and November, 2018 at ten sampling points (OTP 1-OTP 10). The estimation of productivity was made with the light and dark bottle technique. Maximum yields in Gross Primary Productivity (GPP) (0.8738 mgCL-1d-1), Net Primary Productivity (NPP) (0.8513 mgCL-1d-1), as well as Community Respiration (CR) (0.1613 mgCL-1d-1) were recorded at OTP 3, OTP 3 and OTP 8 respectively that had more vegetation covers than in segments without cover. GPP is correlated withions (r = 0.400),ions (r = 0.418), and water temperature (r = 0.379) (p < 0.05), while CR is correlated with ions (r = 0.500) (p < 0.01). The variability of GPP increased mildly with increasing temperature and the nutrients; with predicted regression model productivities of 0.1388, 0.5621, and 0.6066 mgCL-1d-1, corresponding with mean values of 28.41, 0.33 mg/L, 1.04 mg/L and 10.25 mg/L recorded for temperature,,, and ions concentrations. Mean GPP was estimated to result in a comparatively low annual productivity of 188.75 mgCL-1yr-1. Conservation and restoration of riparian vegetation covers in watershed corridors of the river for optimal driver roles were recommended.

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Ogbuagu, D. , Nwahiri, U. , Osuebi, E. , Mbuka-Nwosu, I. and Onwuagba, C. (2019) Investigating Temperature and Nutrients as Drivers of Primary Productivity in Aquatic Environment. Journal of Geoscience and Environment Protection, 7, 92-107. doi: 10.4236/gep.2019.77008.

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