Spatial Distribution Pattern and Abundance of Ageratum Conyzoides (Asteraceae Family) in Riverine and Non-Riverine Habitats of Mweka
The study of distribution of Ageratum conyzoides was conducted in Riverine and Non-riverine habitats of Mweka, focusing on the distribution pattern and abundance of the plant between the two sites. In each site 30 frame quadrats of 0.25 m2 were randomly placed where each individual of Ageratum conyzoides rooted within the quadrat was counted to define the abundance of the plant. Variance to mean ratio (I) was used to determine the distribution pattern of the plant in both sites. The t-test was used to examine if variance to mean ratio (I) had a significant difference from 1 and for testing if there was a significant difference in abundance between these habitats. In both sites Ageratum conyzoides was clumpy distributed while its abundance was higher in non-riverine than in riverine habitats. This difference in abundance was statistically significant (t = 3.070; df = 58; P = 0.0033). Clumped distribution of Ageratum conyzoides might be due to the higher concentration of soil nutrients in one area than in another. Abundance differences might be influenced by edaphic and anthropogenic factors.