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Five most recent topics
- Shelley’s Eagle-owl (Bubo shelleyi): revise global status?
- Le Conte’s Thrasher (Toxostoma lecontei): request for information.
- Lark Bunting (Calamospiza melanocorys): revise global status?
- Henslow’s Sparrow (Passerculus henslowii): revise global status?
- Harris’s Sparrow (Zonotrichia querula): revise global status?
- Scientists brave white-water rapids in search of Critically Endangered wren May 16, 2018With stark cliff walls over 1,600 meters high, the Chicamocha canyon is the deepest in Colombia. Unfortunately for biologists, its difficult terrain houses a number of endemic species. It was in order to confirm the presence of one of these species – Nicéforo’s Wren Thryophilus nicefori – that four biologists from Calidris (BirdLife in Colombia) […]
- Tread softly: new guide for businesses working in important ecosystems May 14, 2018Most businesses want to minimise their impact on the natural world – but it can be hard to know where to start. Luckily, the process has just got a whole lot easier with the release of a new roadmap for companies operating in some of the most biologically significant places on the planet. The report, […]
- Conservationists gather in Middle East to protect migratory birds May 14, 2018“A Summit for the Flyways” united 100 different organisations from 70 different countries to address one problem: how to protect migratory birds on their incredible journey. And with millions of migratory birds passing through the Middle East, it was the perfect opportunity to tackle regional issues, too. BirdLife took advantage of the fact that conservation […]
- Scientists brave white-water rapids in search of Critically Endangered wren May 16, 2018
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%.