Abstract:
Species introductions of anthropogenic origins are a major aspect of rapid ecological change
globally. The increase in human population has led to increased rangeland disturbances and
hence the rapid spread of alien species to this vital ecosystem. The purpose of this research was
to evaluate the impact of invasive plant species in Kiritiri. Development in Kiritiri town and
other urban centres have contributed to rangeland deterioration through land-use practices such
as grazing, crop cultivation and infrastructure. These activities, when not regulated, accelerate
the invasion and spread of introduced plant species. The study also employed a socio-economic
survey that involves the use of questionnaires and interviews to ascertain the perceptions of the
local community regarding origin, impact and uses of the species. Seventy-eight per cent of the
respondents indicated that invasive plant species presence has had a negative effect on
biodiversity in Kiritiri through the loss of native vegetation. The study site was divided into five
blocks whereby transects of 5m
were used to quantify the relative abundance of the targeted plant
species, which was Lantana camara and the derived sample size was estimated. The random and
purposeful sampling was used for data collection and after processing, data was then analyzed
using analytical methods in Statistical Package for Social Sciences (SPSS) computer software
version 23 and Chi square tests were done to test on significant variables among variables
(p≤0.05). Invasive plant invasion was particularly likely in habitats disturbed by human
activities. The study shows that Lantana camara is a major environmental problem in the study
area through its swift colonization of strategic grazing reserves and is rapidly colonizing new
areas. The findings of this study call for concerted efforts to manage the rangeland ecosystem
through wildlife conservation initiatives, sustainable farming, dry land agroforestry, energy,
water and soil conservation methods and proper waste management.
