- Africa (113)
- Americas (217)
- Archive (438)
- Asia (199)
- Australia (28)
- Europe & Central Asia (66)
- Illegal killing of birds (1)
- Middle East (41)
- Pacific (69)
- Species Group (163)
- Taxonomy (1)
- Uncategorized (3)
Five most recent topics
- Red Knot (Calidris canutus): request for information
- Curlew Sandpiper (Calidris ferruginea): request for information
- Bar-tailed Godwit (Limosa lapponica): uplist to Vulnerable?
- Great Knot (Calidris tenuirostris): uplist from Vulnerable to Endangered or Critically Endangered?
- Far Eastern Curlew (Numenius madagascariensis): uplist from Vulnerable to Endangered or Critically Endangered?
Tag Archives: Grey Crowned-crane
When this species was uplisted from Least Concern to Vulnerable in the 2009 Red List update, there was some evidence to suggest that declines may have exceeded a rate of 50% during the past three generations or 45 years (Beilfuss et al. 2007), but data were regarded as patchy and an overall decline of 30-49% was considered a more reasonable estimate. Overall estimates suggest that the species’s global population has declined from over 100,000 individuals in 1985 to 50,000-64,000 individuals in 2004 (Beilfuss et al. 2007). This implies that the species may have declined by over 50% in 19 years, and when these data are extrapolated to a period of 45 years in the past (1967-2012) or past and future (1985-2030), assuming an exponential trend, the calculated rate of decline is c.65-80%.