What is the term for the number of individuals moving out of an existing population?

The term for the number of individuals moving out of an existing population is emigration. Emigration specifically refers to the process through which individuals leave one population to reside in another. It is a crucial component of population dynamics because it can affect population size and structure. When individuals emigrate, they remove themselves from the original population, which can lead to a decrease in overall numbers, and it can also influence genetic diversity and ecosystem interactions. Understanding emigration helps biologists study how populations change over time and how they respond to environmental factors and resources.