The term you’re looking for is competition in ecology, more specifically interspecific competition when it’s between different species.

Quick Scoop

When two or more organisms or populations in a community rely on the same limiting resource (like food, water, or space), they engage in competition. Because that resource is limited, each organism’s access to it is reduced by the presence of the others, which lowers the fitness (chance to survive and reproduce) of all competitors involved.

  • If they are from different species , it is called interspecific competition.
  • If they are from the same species , it is called intraspecific competition.

In many textbooks and exam questions, your exact wording — “this occurs when 2 or more organisms or populations in a community rely or need similar limiting resources” — is answered simply with: competition (or more precisely, interspecific competition , if they emphasize different species).

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