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Five most recent topics
- Cory’s Shearwater (Calonectris diomedea) is being split: request for information on C. diomedea and C. borealis
- The taxonomic treatment of the Little Shearwater (Puffinus assimilis)/Audubon’s Shearwater (P. lherminieri) complex is being revised, and P. bryani is being recognised as a species: request for information
- Aleutian Tern (Sterna aleutica): uplist to Vulnerable or Endangered?
- Ogea Monarch (Mayrornis versicolor): downlist to Near Threatened or Least Concern?
- West Indian Whistling-duck (Dendrocygna arborea): request for information
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%.