Accumulation and recovery capacity of heavy metals in sand mine ponds of the Otamiri River in Owerri, Nigeria

Ogbuagu, Dike Henry; Samuel, Comfort Barikpoa

doi:10.4136/ambi-agua.1226

Cited by 3 publications

(1 citation statement)

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“…This low productivity would correspond with low phytoplankton abundance in the study, which may have in turn been created by intense ongoing in-stream sand mining activities. Ogbuagu and Samuel (2014) had observed that in-stream sand mining activity could exert significant negative impacts on the ecodynamics of the river. The current study therefore would result in a low annual productivity estimate of about 503.335 mgO 2 L −1 yr −1 (=188.751 mgCL −1 d −1 ).…”

Section: Discussionmentioning

confidence: 99%

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

Ogbuagu¹,

Nwahiri²,

Osuebi³

et al. 2019

GEP

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An investigation into the relationship between temperature and the nutrients (3 NO − , 3 4 PO − , 2 4 SO −) 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 −1 d −1), Net Primary Productivity (NPP) (0.8513 mgCL −1 d −1), as well as Community Respiration (CR) (0.1613 mgCL −1 d −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 with 3 4 PO − ions (r = 0.400), 2 4 SO − ions (r = 0.418), and water temperature (r = 0.379) (p < 0.05), while CR is correlated with 2 4 SO − 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 −1 d −1 , corresponding with mean values of 28.41˚C, 0.33 mg/L, 1.04 mg/L and 10.25 mg/L recorded for temperature, 3 NO − , 3 4 PO − , and 2 4 SO − ions concentrations. Mean GPP was estimated to result in a comparatively low annual productivity of 188.75 mgCL −1 yr −1. Conservation and restoration of riparian vegetation covers in watershed corridors of the river for optimal driver roles were recommended.

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Section: Discussionmentioning

confidence: 99%