The line graph delineates the fluctuation in population numbers across different species of wild birds in the United Kingdom between 1970 and 2004. It is immediately obvious that there are significant differences in the existence of the bird species in their natural habitat. The pattern of lines started to show sharp change in the middle years, between 1976 and 1979.
The main feature that distinctly describes the prevalence of the costal species is a sharp soar in the population between 1976 and 1986. In contrast, regarding to the same period of time, farmland wild birds were in a dramatic declining phase. The corresponding indexes for the two species, were 140 and 65 respectively. In addition, the wood land species had recorded a slight change in their population, the index maintained in a range of 90 to 110 over approximately 30 years.
From the mid-1980s, the three types displayed a steady state for the population figures. Whether there was an increase in coastal species, for example, or a decrease in farmland wild type, the pattern of line remained unchanged, apparently. In other words, despite of rising and falling in the bird species, there was insignificant effect on the overall population figures.