This study assessed the Spatial and seasonal variation in Physico-chemical quality of Ikoli creek, Niger Delta, Nigeria. Triplicate samples were obtained from 5 locations for a two seasons viz; March and June, 2014. The water samples were analyzed following standard methods. Mean seasonality results for dry and wet were 27.47 and 27.33 o C (temperature), 6.78 and 7.102 (pH), 27.766 and 42.738 µS/cm (conductivity), 45.492 and 29.354 NTU (turbidity), 7.298 and 23.868 mg/l (total dissolved solid), 24.45 and 10.712mg/l (biological oxygen demand), 5.734 and 7.558 (dissolved oxygen), 0.066 and 0.072 mg/l (nitrite), 0.114 and 0.112 mg/l (nitrate), 3.14 and 3.088 mg/l (chloride), 4.354 and 4.336 mg/l (sulphate), 2.234 and 2.634 mg/l (calcium), 1.888 and 2.576 mg/l (potassium), 3.638 and 4.066 mg/l (sodium) and 1.348 and 1.732 mg/l (magnesium) respectively. There was significance difference (P<0.05) in most parameters for spatial distribution as well as seasonality. The study showed that season affect physico-chemical quality of Ikoli creek. Anthropogenic activities in the creek could affect the physico-chemical quality of water. This could be the reason while there was variation based on spatial distribution

Sampling was done in six sampling stations for one year (August, 2014-July, 2015) to investigate the impacts of makeshift oil refineries on the macro-invertebrates of the Nun River estuary in the Niger Delta region of Nigeria after over 3 years of chronic pollution of this estuary by the makeshift refinery activities. There was also a massive destruction of the benthic and mangrove associated macrofauna of the Nun River estuary and its tributaries. 18 species of benthic macro-invertebrates distributed among 15 genera and 9 families were recorded during the study. A total of 2, 942 individual organisms were collected in which 41 belonged to the Class Polycheata, 684 belonged to the Class Decapoda (subphylum crustacea), and 2, 217 belonged to the Class Gastropoda. The class Gastropoda, made up of 1 family and 2 species had the highest percentage composition (75.36%) and are the most dominant species of the area, followed by the class Decapoda (23.25%), and Class Polychaeta (1.39%), respectively. About 12 organisms (which were present during the baseline study) were absent during the current study. The biodiversity of the estuary is low. The alteration of the physico-chemical parameters as well as the direct contact with the spilled crude oils which resulted from the makeshift oil refinery activities is responsible for the massive destruction of the macro zoobenthos in the area.