Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

تمرين 10

Refer to figure 22.14. Geospiza fuliginosa and Geospiza fortis are found in sympatry on at least one island in the Galápagos and in allopatry on several islands in the same archipelago. Compare your expectations about degree of morphological similarity of the two species in these two contexts, given the hypothesis that competition for food played a large role in the adaptive radiation of this group. Would your expectations be the same for a pair of finch species that are not as closely related Explain.
Figure 22.14 An evolutionary tree of Darwin's finches. This evolutionary tree, derived from examination of DNA sequences, suggests that warbler finches are an early offshoot. Ground and tree finches subsequently diverged, and then species within each group specialized to use different resources. Recent studies have shown, surprisingly, that the two warbler finches are not each other's closest relatives. Rather, Certhidea fusca is more closely related to the remaining Darwin's finches than it is to C. olivacea.