Many species of organisms are found only on islands. Lemurs are found only on Madagascar and koalas only on Australia. Which factor contributes MOST to this situation?
Answers
This is because of Restricted Distribution of species. Parts separated from the main land(say Australia) has unique flora and fauna. As a result of restricted distribution there are low rates of migration and significant isolation by distance, supporting the restricted gene flow.
For example-
1) Egg laying mammals, Pouched mammals are found only in Australia.
2) Birds in Galapogas Island.
Answer:
This is because of Restricted Distribution of species. Parts separated from the main land(say Australia) has unique flora and fauna. As a result of restricted distribution there are low rates of migration and significant isolation by distance, supporting the restricted gene flow.
For example-
1) Egg laying mammals, Pouched mammals are found only in Australia.
2) Birds in Galapogas Island.
Explanation: