lesson
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If you zoom into a forest, you might spot a single red squirrel cracking open an acorn. But if you zoom out, that single squirrel is just one tiny piece of a massive living hierarchy.
Ecologists organize living things into structured levels, starting from a single organism all the way to global biomes.
📊Interactive diagram
How do we clearly draw the line between a group of identical animals and the diverse neighborhood they live in?
Individuals, Populations, and Habitats
An individual organism is a single living thing, such as one oak tree or one honeybee.
A population is all the organisms of the same species living in the same area at the same time.
The place where an organism or population naturally lives and thrives is called its habitat.
For instance, all the mallard ducks floating on a freshwater lake form a single duck population, and the lake is their habitat.
What happens when multiple populations of different plants, animals, and bacteria share that exact same space?
Communities vs. Ecosystems
A community consists of all the different populations living and interacting together in a particular habitat.
A community only includes biotic factors — the living parts of the environment, such as plants, predators, prey, and fungi.