The human population is expanding globally causing alteration in physical and chemical composition of the environment. Ecosystems and human health is under threat, climate is warming and environmental pollution has increased. Some species have changed their original habitat invading native species environment, resulting to competition for the limited resources. Human activities have played major role in introduction of the invasive species to an ecosystem, the alien species have unique adaptations that enable them to survive in new environment (Richardson, 2010). Bio diversification is under threat due to species invasion into ecosystem, the native plants have continued to be extinct and part of this phenomena has been attributed …show more content…
The study also concentrates on how the number of the species influence their completion. Brassica rapa is dominant in a cool climate.It is grown as a spring crop in deep and fertile soils .it is an invasive plant, spread all over the world, it is native to Eurasia(Clark, 2013). While Lolium arundaceum isturfed, tall and erect grass which has spread widely throughout the world. It is highly nutritious stock feed. Both these plants exhibit ability of surviving in new …show more content…
The distance between the species was examined to this effect. The competition is directly proportional to the distance between the species. The two species compete for pollinators, soil nutrients and water. When the distance from each other is smaller, this makes the competition to be stiff. The species compete for pollinators and also the difference in height becomes more effective. The height of the invasive species as well as the height ratio contributes to its superiority during growing season and the increase in propagule