What Is a Population in Marine Biology?

In marine ecology, a population is a group of individuals of the same species that:

• Live in the same geographic area at the same time.
• Interbreed (or have the potential to).
• Interact ecologically—competing, cooperating, or sharing resources.

Populations are defined by genetic similarity, behavior, or ecological role. Their size, distribution, and dynamics shift with food supply, predation, disease, competition, and environmental change (temperature, currents, pH). Understanding populations is essential for fisheries management, conservation, and predicting ecosystem responses to climate change.