Abstract
The effect of environmental (Physicochemical) and biological (plankton) parameters of Ajiwa reservoir were studied for a period of eight months (March–October 2018). Field and laboratory activities were carried out using standard protocols. Mean monthly values of Temperature ranged between 25.87±3.57°C–29.46±0.66°C, Electrical conductivity was between 32.00±3.46µs/cm–210.00±95.39µs/cm. Dissolve Oxygen, Total Dissolved Solid and Biological Oxygen Demand Means of monthly values ranges between 5.53±0.39mg/l–9.35±0.62mg/l, 33.087±0.06mg/l–84.01±4.37mg/l, and 2.69±0.34mg/l–7.27±1.88mg/l. While phosphate and nitrate means of monthly values ranges between 0.04±0.02mg/l–0.09±0.03mg/l, 0.03±0.01mg/l–0.09±0.02mg/l. Four Phytoplankton phyla dominated by Chlorophyta (387org/L), Euglenophyta (160 org/L), Cyanophyta (83 org/L) and Bacillariophyta (63 org/L) were recorded in the reservoir. The Zooplanktons fauna comprises of Rotifers (180 org/L), Cladocerans (149 org/L) and Copepods (78 org/L). Correlation matrix showed that there were significant correlation between Phytoplankton, Zooplankton and Physicochemical parameters. The composition of planktons in the reservoir were affected by seasonal variations and fluctuation of physicochemical parameters
Highlights
Among the important features of the Earth’s landscape are Reservoirs which are the sources of precious water, but provide conducive habitats for plants and animals, moderate hydrological cycles, influence microclimate, enhance the aesthetic beauty of the landscape and many recreational opportunities to mankind (Bhat et al, 2011)
In the graph environmental factors are monthly variation of phytoplankton in Ajiwa reservoir in indicated by the line, length of line represents the degree of relation to months, seasons and physicochemical parameters relationship between sample plots, the distribution of biota and were recorded
They were dominated by Chlorophyta Cyanophyta relative importance of the environmental variable in determining followed by Euglenophyta and Bacillariophyta in the reservoir. the axis
Summary
Among the important features of the Earth’s landscape are Reservoirs which are the sources of precious water, but provide conducive habitats for plants and animals, moderate hydrological cycles, influence microclimate, enhance the aesthetic beauty of the landscape and many recreational opportunities to mankind (Bhat et al, 2011). Reservoirs had received little attention so far in terms of their biological, diversity, conservation and water management. This is in spite of them becoming increasingly important due to the possible consequences of the global climate change (Hofer et al, 2001). The effect of physical factors such as light and heat are of great significance as they are solely responsible for certain phenomena such as thermal stratification, chemical stratification, diurnal and seasonal variations in the distribution and quality of planktons and other aquatic organisms (Ibrahim, 2009; Sharma, 2013; Sarwade and Kamble, 2014). The aim of this research is to determine the effect of environmental parameters on plankton assemblage in Ajiwa reservoir
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