What defines a biodiversity hotspot?

A biodiversity hotspot is defined by its high number of native species that are also under significant threat from human activities or environmental changes. This definition highlights the critical importance of these regions in terms of conservation priority. To qualify as a biodiversity hotspot, a region typically must have at least 1,500 species of vascular plants as endemics and must have lost at least 70% of its original habitat.

This concept is vital because hotspots represent areas where conservation efforts can have the greatest impact on preserving unique biological diversity that may not be found elsewhere. By focusing on these regions, conservationists aim to address not only the loss of endemic species but also the broader implications of habitat destruction.

Other options provided focus either on invasive species or circumstances that do not maintain the unique biodiversity necessary for a hotspot designation. For instance, high numbers of invasive species or exotic species without a corresponding richness of native species do not contribute to the concept of a biodiversity hotspot, which emphasizes the importance of native species facing threats.