Ecology 6th Edition by Manuel Molles

Exercise 2

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 m 2 )

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. smintheus will likely decline (data from Roland, Keyghobadi, and Fownes 2000).