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A Regional Red List may be created by any country or organisation by following the clear, repeatable protocol. The process is as follows: All information relevant to a species conservation status is collected, including species distribution, population trend information, habitat, ecology and life history information, threats to the species and conservation measures currently in place.
The quasi-extinction threshold, or sometimes called the quasi-extinction risk is the population size below which a species is considered to be at extreme risk of quasi-extinction. [5] This threshold varies by species and is influenced by several factors, including reproductive rates, habitat requirements, and genetic diversity.
Extinction Date Probable causes [2] Quaternary: Holocene extinction: c. 10,000 BC – Ongoing: Humans [3] Quaternary extinction event: 640,000, 74,000, and 13,000 years ago: Unknown; may include climate changes, massive volcanic eruptions and Humans (largely by human overhunting) [4] [5] [6] Neogene: Pliocene–Pleistocene boundary extinction: 2 Ma
The 2008 Red List was released on 6 October 2008 at the IUCN World Conservation Congress in Barcelona and "confirmed an extinction crisis, with almost one in four [mammals] at risk of disappearing forever". The study shows at least 1,141 of the 5,487 mammals on Earth are known to be threatened with extinction, and 836 are listed as Data Deficient.
Hunting of tigers for illegal trade of body parts and opportunistic hunting of tiger prey species were considered the main threats to the country's tiger population. [41] Five tigers were recorded in Nam Et-Phou Louey National Protected Area between April 2003 and June 2004. Large wild prey species occurred at low densities so that tigers ...
A subsequent survey was planned in Meru Betiri National Park in the autumn 1992 with the support of WWF Indonesia, deploying camera traps for the first time. From March 1993 to March 1994, cameras were deployed at 19 locations but did not yield a picture of a tiger. During this period, no tracks indicating the presence of tigers were discovered ...
Endangered species are addressed through Canada's Species at Risk Act. A species is deemed threatened or endangered when it is on the verge of extinction or extirpation. Once a species is deemed threatened or endangered, the Act requires that a recovery plan to be developed that indicates how to stop or reverse the species' population decline. [33]
Diagram of Lower Risk / near threatened in the older IUCN version 2.3, beside the former Lower Risk / conservation dependent subcategory.. Before 2001, the IUCN used the version 2.3 Categories and Criteria to assign conservation status, which included a separate category for conservation-dependent species ("Conservation Dependent", LR/cd).