JMR-2017v7n17 - page 8

Journal of Mosquito Research 2017, Vol.7, No.17, 134-141
Figure 1 Minna street guide map showing the study area (Source: Urban and Regional Planning Department, FUT, Minna, 2012)
1.3 Collection and analyses of water samples for physicochemical properties of rice fields
Water samples were collected from each selected rice field between the hours of 08:00 and 09:00 am, at a depth of
5 cm, on each sampling day. 500 ml of water sample was collected per rice field using sample bottles of 500 ml
capacity. Temperature (
C) and Hydrogen ion concentration (pH) were measured
in situ
at the sites, using mercury
thermometer and pH meter, respectively. The other parameters namely Turbidity, Conductivity, Potassium,
Sodium, Chloride, Nitrate, Phosphate, Alkalinity, Hardness, and Dissolved Oxygen (DO) were determined in the
laboratory within 2-3 hours of collection, while Biochemical Oxygen Demand (BOD) was determined on day five
after collection, using the standard methods described by American Public Health Association (1992).
1.4 Statistical analysis
Data collected from all the sites and sampling periods were processed as mean ±S.D, using EXCEL programme.
Mean values of the variables per treatment were compared for significance of statistical differences using
appropriate tools of ANOVA and Duncan Multiple Range Test at P = 0.05 level of significance.
2 Results
2.1 Physicochemical condition of the rice field mosquito larval habitats
The indices of physicochemical conditions of the rice field mosquito larval habitats in Minna are presented in
Table 1. Temperature, Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) did not varies significantly
1,2,3,4,5,6,7 9,10-11,12,13,14,15,16
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