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How does community ecology study interactions among species living in the same habitat?

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Diagram showing energy flow in a food chain from a tree to a caterpillar, then to a bird, and finally to microbes, with red arrows illustrating energy transfer and heat loss at each stage. — community ecology Energy transfer and heat loss along a food chain.

Community ecology studies the organization and functioning of biological communities—assemblages of interacting populations living within a specific habitat. Ecologists analyze these systems by examining how species influence one another through various interspecific interactions, which are categorized by their positive (+), negative (–), or neutral (0) effects on the participants.12

These interactions include:
* Mutualism (+, +): Both species benefit.2
* Exploitation (+, –): One species benefits at the expense of another.2
* Commensalism (+, 0): One benefits while the other is unaffected.2
* Interspecific competition (–, –): Both species incur costs.2
* Amensalism (–, 0): One suffers while the other is unaffected.2
* Neutrality (0, 0): Neither species is affected.2

Ecologists also study how these relationships create complex structures, such as food webs and guilds, and how species undergo coevolution to adapt to one another over time. Through processes like character displacement, species may evolve differences to minimize competition and occupy distinct niches within the community.13