Adaptive radiation:
According to this theory, adaptive radiation is a process of evolution in which the organisms will adapt to the change in the surroundings and diversify rapidly into new forms [different from their ancestral form]. The change in the surrounding particularly indicates availability of new resources, alterations in biotic interactions, new habitat, new food reserve or opening of any other new environmental niches. The others which are not able to adapt the related changes in environment will eventually die. Example: Change in the beak shape of Darwin finches are observed due to change in their habitat and food habits.
Climate change theory: This theory explains that, evolution can take place due to climatic changes in a particular environment. The organisms evolve to keep pace with the changing climate so that they can survive. The climatic changes includes temperature change, change in rain pattern, droughts, storm surge, change in sea level, shifting patterns of precipitation, longer growing seasons etc, these all can affect the organisms lifestyle living in that particular are and to cope with this the organisms evolve accordingly. example- Biologists have observed squirrels and salmon developing at an accelerated pace, causing them to reproduce at a younger age.
These theories are different from one other because adaptive radiation theory in accounts changes like change in food habits, change in habitat, change in mating pattern, change in population pattern etc, whereas climatic change theory will account only those changes which are related to climatic and weather changes.
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