Figure 10.11 and the upper portion of figure 21.13 show the relationship between meadow size and population size in two butterfly species. How are the patterns shown by the two graphs similar? How do they differ? (note 1 ha = 10,000 m2)
Figure 10.11 The relationship between meadow area and the size of Rocky Mountain Parnassian butterfly, Parnassius smintheus, populations. With forest encroachment into alpine meadows in the Rocky Mountains, populations of P. smintheuswill likely decline (data from Roland, Keyghobadi, and Fownes 2000).