It is an indicator of naturalness or biodiversity intactness. It is defined as the mean abundance of original species relative to their abundance in undisturbed ecosystems. A mean species abundance of 0% indicates a completely destroyed ecosystem, with no original species remaining.
References
- IPBES (2018) The IPBES regional assessment report on biodiversity and ecosystem services for Asia and the Pacific. Bonn, Germany: The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services. Available at: https://www.ipbes.net/assessment-reports/asia-pacific
GEO-1-6
It expresses the mean abundance of original species in disturbed conditions relative to their abundance in an undisturbed habitat.