Geographical Location

The study of Ageratum conyzoides distribution took place in riverine and non-riverine habitats of Mweka village which lies on the southern slopes of Mount Kilimanjaro [20]. The riverine habitat was the one from Kichau River while non-riverine habitat was chosen randomly from inland area of Mweka village. This village lies between lies between 37°15’ and 37°21’E and 3°03’ to 3°20’S with elevation of 800 – 2000 m.a.s.l. The rivers present in Mweka village originate from the Mount Kilimanjaro.

Climate

Double rain seasons exist at Mweka, long rains March to June and the shorter one starts November ends in January. The annual range of rainfall is 1000 to 1700 mm but it can rise up to 2500mm depending on aspect

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Mean abundance of Ageratum conyzoides recorded in thirty frame quadrats in the plot, and variance of Ageratum conyzoides abundance per quadrat to the plot mean were calculated. Mean and variance were used to get variance to mean ratio for determination of distribution pattern of Ageratum conyzoides in riverine and non-riverine plots. The distribution is said to be random if variance to mean ratio is equal to 1, clumped when the variance to mean ratio is greater than 1 and regular if the variance to mean ratio is less than 1 [29]. We employed two tailed t-test at 0.05 significance level to confirm if variance to mean ratio is significant different from 1. Plot abundance was determined by summing up the number of individual plants recorded in each frame quadrat. The t-test was used to test null hypothesis that abundance between two sites was the same. D 'Agostino-Pearson test for normal distribution was also employed to test if the data fall under normal distribution. The presentation of the data is in tables and graphs. Also for data analysis, R version 3.0.1, MedCalc version 12.5.0.0 and Microsoft Excel version 14.0.4760.1000 (32-bit) were