Making Species: Speciation
Speciation needs reproductive isolation!
Allopatric speciation: most common form, driven by geographic isolation
- colonization of new habitats
- development of geographic barriers
- extinction of intermediate populations
Adaptive radiation: speciation + adaptation good examples in archipelagos
1. colonization of new islands
2. Allopatric speciation on each island as adaptation to the specific environments
3. cross-colonization of allopatric species