Returns the category implied by the EOO (B1) and AOO (B2) size
thresholds only. This is a screening aid, exactly like GeoCat: a full
Criterion B listing additionally requires at least two of the sub-criteria
(a) severe fragmentation / few locations, (b) continuing decline, and
(c) extreme fluctuation. Never report these as final categories.
Usage
iucn_category_B(eoo_km2 = NA_real_, aoo_km2 = NA_real_)
Arguments
- eoo_km2, aoo_km2
Numeric range sizes in square kilometres (recycled).
Value
A list with eoo_category, aoo_category and
combined (the more threatened of the two size-based flags), each a
character vector of the input length.
Details
Vectorised: eoo_km2 and aoo_km2 may be columns of an assessment
summary. Following the IUCN Guidelines (sect. 4.10), when the EOO is smaller
than the AOO the EOO is set equal to the AOO before applying the thresholds.
