6 Glossary
6.1 Criteria
Criterion A Reduction in geographic distribution
Criterion B Restricted geographic distribution
Criterion C Criterion C assesses declines in ecosystem functions or processes based on symptoms of abiotic (environmental) degradation.
Criterion D Criterion D assesses declines in ecosystem functions or processes disruption of biotic processes, including declines of biota with key functional roles.
Criterion E Quantitative risk analysis
6.2 Ecosystem Metrics
Area of occupancy (AOO) A standardised measure of the area that is occupied by an ecosystem type.
Extent of occurrence (EOO) A standardised measure of the area within which all occurrences of an ecosystem type exist
6.3 Ecosystems
Tropical-subtropical forests biome (T1) The Tropical-subtropical forests biome includes moderate to highly productive ecosystems with closed tree canopies occurring at lower latitudes north and south of the equator. (source: IUCN Global Ecosystem Typology)
Tropical/Subtropical lowland rainforests (T1.1) These closed-canopy forests are renowned for their complex structure and high primary productivity, which support high functional and taxonomic diversity. (source: IUCN Global Ecosystem Typology, T1.1)