The IUCN Red List uses specific quantitative criteria to assign conservation status to species. For the 'Critically Endangered' category (CR), one of the criteria related to geographic range (Criterion B) requires either an Extent of Occurrence (EOO) estimated to be less than 100 km² or an Area of Occupancy (AOO) estimated to be less than 10 km². Both must be accompanied by observations of severe fragmentation, occurrence at only a limited number of locations, or continuing decline. The question specifically asks about 'Extent of Occurrence'.
International Union for Conservation of Nature (IUCN) considers a species to be ‘critically endangered’ if the spatial measure (extent of occurrence) is estimated to be less than ______ km².
Asked in PPSC CS Prelims 2018 · Topic: Biodiversity (IUCN Red List Categories and Important Species Conservation Initiatives)
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