Biology 1st Edition by Jerome Krueger, Kendra Hill, Robert Noyd

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Figure shows the relationship between six different species (y-axis) and intensity of competition for resources (x-axis) in a single habitat. Each letter on the y-axis of the graph represents the presence of a separate species and its presence or absence in response to competition. How does an increasing level of competition affect the number of species present in a habitat? Which species is least/most sensitive to competition?
Figure An example of resource competition.
Adapted from Figure. J. Vandermeer et al. 2002. Increased competition may promote species coexistence, J. Vandermeer et al. Proceedings of the National Academy of Sciences. V.99(13) 8731-8736.