What are all of the populations in an ecosystem called?
All the populations in an ecosystem are called a community. A population is composed of one particular species, such as a population of cardinal birds, a population of red foxes, or a population of gray squirrels. When you combine two or more populations together in the same general location, you have a community. Think about all of the living organisms in your neighborhood. At my house, we have four human beings, four dogs, and one cat. A community could be all of the populations that exist within my entire neighborhood.
When you combine the living factors of a community together with the nonliving factors of the area it lives in, you have an ecosystem. The nonliving factors of an ecosystem would be water, soil, temperature, light, and climate. The biotic factors and the abiotic factors work together forming a cycling of nutrients and required raw materials that are necessary to life as we know it here on the earth.
A population includes two or more members of the same species living at the same place in the same time. An example of a population is individuals of bluegill fish (Lepomis macrochirus) living within a pond. The same pond will likely include many other populations of different species of plants, animals, bacteria and protists. All of the populations of organisms that live and interact within a single ecosystem is called a community. The pond community would include all of the different species living there, including bacteria, protists, snails, amphibians, and plants. An ecosystem includes all of the living organisms (the community) along with the nonliving environment. The nonliving environment of the pond ecosystem would include, for example, the water in the pond, the soil, the gravel and the rocks within the pond.