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2000 IUCN red list of threatened species by Craig Hilton-Taylor PDF

Posted On February 24, 2018 at 1:04 am by / Comments Off on 2000 IUCN red list of threatened species by Craig Hilton-Taylor PDF

By Craig Hilton-Taylor

ISBN-10: 2831705649

ISBN-13: 9782831705644

ISBN-10: 2831705657

ISBN-13: 9782831705651

Release of the 2000 purple record is an immense landmark for IUCN. it's the first time that listings of animals and vegetation were mixed and the 1st time that the purple record has been produced on CD-ROM. The 2000 crimson record combines new assessments‹including all chicken species, many antelope and bat species, such a lot primates and sharks, all Asian freshwater turtles, extra molluscs, and lots of others‹with these from past courses. the combo of animals and crops right into a unmarried checklist containing exams of greater than 18,000 taxa (11,000 of that are threatened species) and the flow in the direction of more suitable documentation of every species at the record signifies that a hard-copy model of the purple record may run to a number of volumes. This, mixed with the truth that the pink checklist may be up to date each year, ended in the choice to liberate the purple checklist in digital layout, through the realm huge net and as a CD-ROM.

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Extra info for 2000 IUCN red list of threatened species

Sample text

Nevertheless, the very rapidly deteriorating status of tortoises and freshwater turtles in Southeast Asia has resulted in many important changes in the listings of these species. These species are being heavily exploited for food, and in some cases medicine, and the harvest levels are highly unsustainable, and unregulated. As populations are disappearing in Southeast Asia, there are disturbing signs that the focus of the harvest will shift to the Indian Subcontinent, and perhaps even further afield to the Americas and Africa.

The criterion for extinction in the IUCN Red List Categories is that “A taxon is presumed extinct in the wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual) throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form” (IUCN 1994, p. 14). For an ephemeral orchid species, that only appears in the first year after a fire and which grows in a habitat where fires only occur approximately once every 25 years, it could take a very long time to gather sufficient evidence to support an Extinct listing.

It should be noted that the results presented here are only for threatened birds and a selection of threatened mammals and plants, and when these analyses are performed for a broader variety of species, some changes might be expected. This is partly confirmed by the analysis of threats in the USA by Wilcove et al. (2000), which found that for threatened freshwater organisms, pollution was the second most important threat after habitat loss. Threatened subspecies and sub-populations Countless species, although not yet globally threatened, now exist in reduced numbers as highly fragmented and isolated sub-populations, and many of these sub-populations are threatened with extinction.

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2000 IUCN red list of threatened species by Craig Hilton-Taylor

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