How is "indigenous" best defined?

The term "indigenous" refers to species that are native to a particular area, meaning they originate and thrive in that specific location without human intervention. This definition highlights the natural occurrence of these species within their ecosystems over long periods of time. Understanding the concept of indigenous species is crucial, particularly in the context of ecosystems and biodiversity, as they often play vital roles in their habitats, contributing to ecological balance.

The other definitions provided do not accurately capture the essence of what indigenous signifies. For example, nonnative species are those that have been introduced from other regions and may adapt to the new environment but do not have natural historical ties to it. Similarly, invasive species, which can be aggressive towards local populations, are often nonnative and can disrupt established ecosystems. Species that are adaptable to various environments may thrive in many settings, but this trait does not define them as indigenous to any specific locale. Thus, the correct interpretation of "indigenous" is that it refers to species that are inherently linked to their native habitat.