Question

3. There are three species of Emerald Finch in the US, their distribution is shown on the map below. One hypothesis proposed to explain this distribution suggests that Emerald Finch were once found in a continuous range from East Coast to West Coast. Now, there are three species of Emerald Finch that inhabit the United States: Western, Eastern and Island off the coast of California. Western (W) Eastern (E) Island (1)

Answer 1

ANS. That is among the conclusions in a new study testing the importance of “first arrival” in controlling adaptive radiation of species, a hypothesis famously proposed for “Darwin's Finches,” birds from the Galapagos Islands that were first brought to scientific attention by the famous naturalist.

There are three species of emerald Finch in the US.They are distributed in western (W), Eastern(E), and Island (I). However, the Galapagos finches helped Darwin solidify his idea of natural selection. These birds, although nearly identical in all other ways to mainland finches, had different beaks. Their beaks had adapted to the type of food they ate in order to fill different niches on the Galapagos Islands.

1. Geospaza magnitosti 2. Geospica fortis 3. Geospiza parvula 4. Certhidea olivacea FINCHES FROM GALÁPAGOS ARCHIPELAGO