Explain how microevolution and migration can affect an ecosystem.

Answer and explanation;

Microevolution occurs on small time scales within species. It is the change in allele frequencies brought about by mutation, genetic drift, gene flow, and natural selection below the species level.  Over time, microevolution can translate into macroevolution, which is larger scale change above the species level.

As micoroevolution occurs, the genetic composition of a species alters. The changes make species more adapted to their environment, and as such better able to exploit the local ecosystem.

Therefore microevolution will alter the composition of an ecosystem by modifying the agents acting within it. For example, a new cat mutant could catch birds more effectively and thus reduce the bird population, with cascading effects throughout the ecosystem.

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