* Native: This is a common and accurate term, emphasizing that the species originated and evolved in that ecosystem.
* Indigenous: Similar to native, this term emphasizes the species' historical presence and connection to the ecosystem.
* Endemic: This term refers to a species that is found only in a specific geographic area, often an ecosystem.
* Resident: This term simply describes a species that lives in a particular place, including an ecosystem.
* Naturalized: This term is used for a species that has been introduced to an ecosystem but has become established and self-sustaining. While not strictly "native," they are now part of the ecosystem.
The best word depends on the specific context and the nuance you want to convey. For example, if you are talking about a species that is threatened by habitat loss, "native" might be the most appropriate term. If you are talking about a species that is unique to a specific ecosystem, "endemic" might be a better choice.