Rare species

Source: Wikipedia, the free encyclopedia.

A rare species is a group of

organisms that are very uncommon, scarce, or infrequently encountered. This designation may be applied to either a plant or animal taxon, and is distinct from the term endangered or threatened. Designation of a rare species may be made by an official body, such as a national government, state, or province. The term more commonly appears without reference to specific criteria. The International Union for Conservation of Nature does not normally make such designations, but may use the term in scientific discussion.[1]

Rarity rests on a specific species being represented by a small number of organisms worldwide, usually fewer than 10,000. However, a species having a very narrow

endemic range or fragmented habitat also influences the concept.[2][3] Almost 75% of known species can be classified as "rare".[4]

Rare species are species with small populations. Many will move into the endangered or vulnerable category if the negative factors affecting them continue to operate. Well-known examples of rare species - because these are large terrestrial animals - include the

.

They are not endangered yet, but classified as "at risk"[5][6], although the frontier between these categories is increasingly difficult to draw given the general paucity of data on rare species. This is especially the case in the world Ocean where many 'rare' species not seen for decades may well have gone extinct unnoticed, if they are not already on the verge of extinction like the mexican Vaquita.[7]

A species may be endangered or vulnerable, but not considered rare if it has a large, dispersed population.

IUCN uses the term "rare" as a designation for species found in isolated geographical locations. Rare species are generally considered threatened because a small population size is obviously less likely to recover from ecological disasters
.

A rare plant's legal status can be observed through the USDA's Plants Database.

Rare species

Common name Scientific name Conservation status Population Global range
Giant Panda
Ailuropoda melanoleuca Vulnerable 1,000 to 3,000
Sichuan province
)
Wild Bactrian camel Camelus ferus
Critically endangered
950
Southern Mongolia
Cheetah Acinonyx jubatus Vulnerable 7,000 to 10,000
Southwestern Asia
California condor Gymnogyps californianus Critically endangered 446 West North America
Alagoas curassow Mitu mitu Extinct in the wild 130 (in captivity) North East Brazil
Philippine eagle Pithecophaga jefferyi Critically endangered 200 breeding pairs Eastern Luzon, Samar, Leyte, and Mindanao
Black softshell turtle Nilssonia nigricans Extinct in the wild 150 to 300 (in captivity) Sultan Bayazid Bastami shrine at Chittagong
Key tree-cactus
Pilosocereus robinii Critically Endangered 7 to 15 Florida Keys, Mexico, Puerto Rico
Kakapo
Strigops habroptilus
Critically Endangered 149 New Zealand
Maui's dolphin
Cephalorhynchus hectori maui
Critically Endangered 55 New Zealand
Vaquita
Phocoena sinus
Critically Endangered 12 Gulf of California (Mexico)

See also

References

  1. ^ "Assessment Process". www.iucnredlist.org. Retrieved 2017-11-14.
  2. ^ R. MacNally and G. W. Brown, Reptiles and Habitat Fragmentation in the Box-ironbush Forests of Central Victoria, Australia: Predicting Compositional Change and Faunal Nested-ness, Oecologia 128:116–125 (2001).
  3. .
  4. .
  5. ^ "Rare Species". www.encyclopedia.com. Retrieved 2017-11-15.
  6. ^ "IUCN – A brief history". IUCN. 2017-10-06. Retrieved 2017-11-15.
  7. ^ Briand, Frederic (October 2012). "Species Missing in Action - Rare or Already Extinct?". National Geographic.

External links

Further reading