The IUCN Red List of Threatened Species™ Red List Criteria: Criterion B.

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Presentation transcript:

The IUCN Red List of Threatened Species™ Red List Criteria: Criterion B

Criterion B Restricted geographic range + fragmentation, continuing decline or extreme fluctuations

Criterion B Based on either: B1: Estimated extent of occurrence AND / OR B2: Estimated area of occupancy AND at least TWO of a-c: a. Severely fragmented or few locations b. Continuing decline c. Extreme fluctuations

Criterion B

Example: EOO = 22 km 2 AOO = 8 km 2 Threatened by illegal collecting = 1 location Continuing decline in the # of mature individuals and AOO No extreme fluctuations CR B1 CR B1+B2 CR B1a+B2a CR B1ab(ii,v)+B2ab(ii,v) CR B1ab(ii,v)+2ab(ii,v)

Criterion B EOO < 100 km 2, AOO < 10 km 2 Continuing decline But, >1 location, not severely fragmented and no extreme fluctuation Cannot use CR

Criterion B Meets CR B2b(v), but: >10 locations not a No severe fragmentation not a No extreme fluctuations not c NT B2b(v) Meets CR B2b(v), but: >10 locations not a No severe fragmentation not a No extreme fluctuations not c NT B2b(v) Meets VU B1a, but: No continuing declines not b No extreme fluctuations not c NT B1a Meets VU B1a, but: No continuing declines not b No extreme fluctuations not c NT B1a Near Threatened (NT) examples: Meets ab(iii,v): EOO = 22,000 km² and/or AOO = 3,000 km² (highly certain estimates) EOO = 30,000 km² and/or AOO = 3,000 km² (uncertain estimates) NT, nearly meeting VU B1ab(iii,v)+2ab(iii,v)

The IUCN Red List of Threatened Species™ Criterion B Points to remember: May use B1 or B2, or both Must also meet at least two of the subcriteria a, b or c The subcriteria will be the same for B1 and B2 e.g. B1ab(ii,iii,v)+2ab(iii)

The IUCN Red List of Threatened Species™ Criterion B May use B1 or B2, or both Must also meet at least two of the subcriteria a, b or c The subcriteria will be the same for B1 and B2 B1a / B2a may be based on either severe fragmentation OR number of locations Remember the definitions of the terms (e.g., location) Be very careful with b(iii) Points to remember: