By Jonathan Baillie
This research of the data inside the 2004 IUCN crimson checklist of Threatened Species offers an perception into the prestige and developments of the world’s species of vegetation and animals, with a spotlight on these at maximum chance of extinction. The e-book highlights the taxonomic teams and species which are on the maximum chance of extinction; contemporary documented extinctions; developments within the prestige of threatened species, together with the recent crimson checklist Index; areas of the area the place threatened species are usually chanced on; the threats which are using species in the direction of extinction; the social and monetary context during which extinctions are happening; and the conservation responses which are to be had. This extensive research is the 1st significant booklet through the purple checklist Consortium, a bunch of enterprises comprising IUCN (in specific the Species Survival Commission), BirdLife foreign, Conservation foreign (in specific the guts for utilized Biodiversity Science), and NatureServe.
Read Online or Download A 2004 IUCN Red list of threatened species: A Global Species Assessment (Occasional Paper of the Iucn Species Survival Commission) PDF
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Additional resources for A 2004 IUCN Red list of threatened species: A Global Species Assessment (Occasional Paper of the Iucn Species Survival Commission)
One species is listed as threatened and the other is considered to be Least Concern. 2). Other reptile groups such as the Amphisbaenia (worm lizards) have not been evaluated at all, and likewise very few snakes and lizards have been evaluated. Within the lizards, the main focus has been on the Iguanidae and other closely related families. Many snakes and lizards are cryptic, hard to find and poorly known. However, the Global Reptile Assessment (see Appendix 1) started in 2004 will greatly improve our knowledge of this group of vertebrates.
A. Mammals (n = 4,776) b. Birds (n = 9,784) The proportion of species considered not threatened also differs markedly with 78% of birds, 56% of mammals and 39% of amphibians being listed as Least Concern. The relatively large numbers of Least Concern bird species is, however, no reason to be complacent as many common bird species are in decline across the world (BirdLife International 2004b). 2 clearly indicates that a large number of mammal, bird and amphibian species are close to extinction, with 27% of the species evaluated listed as globally threatened because they have small and/or rapidly declining populations and/or small ranges.
14 Mace and Balmford (2000) found no clear-cut relationships between the percentage of threatened species in a group and either its species richness or its average body mass or body size. Mace and Balmford (2000) suggest that much more detailed analyses of life history traits and extinction risk are required to disentangle the causes and constraints. Some progress in this regard has been made in a recent study of the impacts of human population density on extinction risk in carnivores (Cardillo et al.