Difference between adaptive radiation and dispersal of animal

Adaptive radiation is when a species is suddenly allowed to diversify due to an increase of available niches.

Dispersal is an ecological process that involves the movement of an individual or multiple individuals away from the population in which they were born to another location, or population, where they will settle and reproduce. The two most common forms of dispersal are: natal or dispersal. Natal dispersal is the first movement of an organism from its birth site to the site in which it first attempts to reproduce. Adult dispersal entails changing location in space after reaching reproductive maturity, usually involving movement from one habitat patch to another. Another type of dispersal that does not fall into these two categories is gamete dispersal, which is especially common for non-motile adult individuals, such as plants. Relocation to a new site is a usual part of the life cycle of many plants and animals and is viewed as an adaptive trait in life history.