By Craig Hilton-Taylor
Release of the 2000 pink record is a tremendous landmark for IUCN. it's the first time that listings of animals and vegetation were mixed and the 1st time that the crimson record has been produced on CD-ROM. The 2000 purple record combines new assessments‹including all poultry 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 earlier guides. the mix of animals and vegetation right into a unmarried record containing exams of greater than 18,000 taxa (11,000 of that are threatened species) and the circulate in the direction of greater documentation of every species at the checklist implies that a hard-copy model of the crimson record may run to numerous volumes. This, mixed with the truth that the pink checklist could be up-to-date each year, resulted in the choice to liberate the purple checklist in digital structure, through the realm broad net and as a CD-ROM.
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For example, the Pacific Island Land Snail Group was established partly under the auspices of SSC’s Conservation Breeding Specialist Group (CBSG) to monitor the impacts of the introduced snail and to establish ex situ breeding populations for the remaining native species. In most cases, it takes many years before the lack of sightings of a species generate sufficient concern to stimulate active searches, and even then, it could take many more years before sufficient negative evidence has accumulated to be able to pronounce that a species is Extinct.
Despite incomplete inventorying, global patterns of hotspots in terms of diversity and endemism clearly emerge. There are also three main types of freshwater habitat that are particularly critical to freshwater mollusc conservation, which also have a very diverse fauna and are highly vulnerable: rivers, springs and underground aquifers, and ancient oligotrophic lakes. The spring snails represent 19% of all threatened molluscs, which is a major increase over the 12% listed in 1996. While there are a number of genuine increases in the numbers of threatened molluscs (see the Vulnerable and Endangered categories in Table 2), some of the more marked changes such as the decrease from 257 to 222 Critically Endangered species is reflective of better knowledge (Table 2).
The process of decline and eventual extinction may take place over many years or even centuries in the case of very long-lived organisms like some of the large mammal and tree species. , the excessive hunting of the Passenger Pigeon Ectopistes migratorius, or the mass extinction of native snails in French Polynesia and Hawaii following the introduction of the predatory snail Euglandina rosea to Pacific islands) have very noticeable impacts, and can then, as in the latter case, be the subject of intensive study.