What defines a population in ecological terms?

In ecological terms, a population is defined as a group of individuals that belong to the same species and live in a specific area. This definition emphasizes two key characteristics: the individuals must be of the same species, which means they are capable of interbreeding and producing fertile offspring, and they must be located in a shared geographical area, which affects their interactions, mating behaviors, and resource availability.

This biological and spatial component is fundamental to understanding population dynamics, such as growth rates, age structure, and the effects of environmental factors on a group of organisms. By focusing on species and locality, this definition facilitates the study of ecological relationships, conservation efforts, and species management within ecosystems.

In contrast, the other options focus on broader or different ecological concepts. While biodiversity refers to the variety of species in an area, it does not define a specific population. Ecosystems encompass interactions among different populations and their physical environment, but do not define a single population. Biomass relates to the total organic material within a habitat, which is not specific to a single population definition. Thus, the definition provided in the correct choice is crucial for understanding ecological studies related to species populations.