Fraction of scleractinian corals, amphibians, birds and mammals that are classified as 'threatned' as of 2011

Range 20 - 43 %
Organism Metazoa animals
Reference Barnosky AD et al., Has the Earth's sixth mass extinction already arrived? Nature. 2011 Mar 3 471(7336):51-7. doi: 10.1038/nature09678. p.54 right column 2nd paragraphPubMed ID21368823
Comments P.54 right column 2nd paragraph: "For a very few groups, modern assessments are close to adequate. Scleractinian corals, amphibians, birds and mammals have all known species assessed (ref 6) (Fig. 2), although species counts remain a moving target (ref 27). In these groups, even though the percentage of species extinct in historic time is low (zero to 1%), 20–43% of their species and many more of their populations are threatened (Fig. 2). Those numbers suggest that [investigators] have not yet seen the sixth mass extinction, but that [they] would jump from one-quarter to halfway towards it if ‘threatened’ species disappear."
Entered by Uri M
ID 112755