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Endangered species

subspecies of tiger]] are already extinct.[1] The most endangered Asiatic top predator, the dhole, is on the edge of extinction.

An endangered species is a population of organisms which is facing a high risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters. The International Union for Conservation of Nature (IUCN) has calculated the percentage of endangered species.

Many nations have laws offering protection to conservation reliant species: for example, forbidding hunting, restricting land development or creating preserves.

Only a few of the many species at risk of extinction actually make it to the lists and obtain legal protection like Pandas. Many more species become extinct, or potentially will become extinct, without gaining public notice.


Conservation status

The conservation status of a species is an indicator of the likelihood of that endangered species becoming extinct. Many factors are taken into account when assessing the conservation status of a species, including statistics such as the number remaining, the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.[2] The IUCN Red List of Threatened Species is the best-known worldwide conservation status listing and ranking system.[3]

It has been estimated that over 40% of all living species on Earth are at risk of going extinct.[4] Internationally, 199 countries have signed an accord agreeing to create Biodiversity Action Plans to protect endangered and other threatened species. In the United States this plan is usually called a species Recovery Plan.

IUCN Red List

IUCN Red List refers to a specific category of threatened species, and may include critically endangered species. The IUCN Red List uses the term endangered species as a specific category of imperilment, rather than as a general term. Under the IUCN Categories and Criteria, endangered species is between critically endangered and vulnerable. Also critically endangered species may also be counted as endangered species and fill all the criteria

The more general term used by the IUCN for species at risk of extinction is threatened species, which also includes the less-at-risk category of vulnerable species together with endangered and critically endangered.

IUCN categories, and some animals in those categories, include:

  • Extinct: Examples: Atlas bear, Aurochs, Bali Tiger, Caribbean Monk Seal, Carolina Parakeet, Caspian Tiger, Dinosaurs, Dodo, Dusky Seaside Sparrow, Elephant Bird, Golden Toad, Great Auk, Haast's Eagle, Japanese Sea Lion, Javan Tiger, Moa, Passenger Pigeon, Pterosaurs, Saber-toothed cat, Short-faced bear, Steller's Sea Cow, Thylacine, Toolache Wallaby, Western Black Rhinoceros, Woolly Mammoth, Woolly Rhinoceros, Yangtze River Dolphin
  • Extinct in the wild: captive individuals survive, but there is no free-living, natural population. Examples: Barbary Lion (maybe extinct), Catarina Pupfish, Hawaiian Crow, Northern White Rhinoceros, Scimitar Oryx, Socorro Dove, Spix's Macaw (maybe critically endangered), Wyoming Toad
  • Critically endangered: faces an extremely high risk of extinction in the immediate future. Examples: Addax, African Wild Ass, Alabama Cavefish, Amur Leopard, Arakan Forest Turtle, Asiatic Cheetah, Axolotl, Bactrian Camel, Brazilian Merganser, Brown Spider Monkey, California Condor, Chinese Alligator, Chinese Giant Salamander, Ethiopian Wolf, Gharial, Hawaiian Monk Seal, Iberian Lynx, Island Fox, Javan Rhino, Kakapo, Leatherback Sea Turtle, Mediterranean Monk Seal, Mexican Wolf, Mountain Gorilla, Philippine Eagle, Red Wolf, Saiga, Siamese Crocodile, Spix's Macaw (maybe extinct in the wild), Sumatran Orangutan, Sumatran Rhinoceros, Takhi, Vaquita
  • Endangered: faces a very high risk of extinction in the near future. Examples: African Penguin, African Wild Dog, Asian Elephant, Asiatic Lion, Blue Whale, Bonobo, Bornean Orangutan, Chimpanzees, Dhole, Giant Otter, Giant Panda, Goliath Frog, Gorillas, Green Sea Turtle, Grevy's Zebra, Hyacinth Macaw, Japanese Crane, Lear's Macaw, Malayan Tapir, Markhor, Persian Leopard, Proboscis Monkey, Pygmy Hippopotamus, Rothschild Giraffe, Snow Leopard, Steller's Sea Lion, Tasmanian Devil, Tiger, Volcano Rabbit, Wild Water Buffalo
  • Vulnerable: faces a high risk of extinction in the medium-term. Examples: African Elephant, Clouded Leopard, Cheetah, Dugong, Far Eastern Curlew, Fossa, Galapagos Tortoise, Gaur, Giant Oceanic Manta Ray, Golden Hamster, Great White Shark, Crowned Crane, Hippopotamus, Humboldt Penguin, Indian Rhinoceros, Komodo Dragon, Lion, Mandrill, Maned Sloth, Mountain Zebra, Polar Bear, Red Panda, Sloth Bear, Takin, Yak
  • Near threatened: may be considered threatened in the near future. Examples: African Grey Parrot, American Bison, Asian Golden Cat, Blue-billed Duck, Eurasian Curlew, Jaguar, Leopard, Magellanic Penguin, Maned Wolf, Narwhal, Okapi, Solitary Eagle, Southern White Rhinoceros, Striped Hyena, Tiger Shark
  • Least concern: no immediate threat to the survival of the species. Examples: American Alligator, American Crow, Indian Peafowl, Baboon, Bald Eagle, Brown Bear, Brown Rat, Brown-throated sloth, Cane Toad, Common Wood Pigeon, Cougar, Emperor Penguin, Eurasian Lynx, Giraffe, Grey Wolf, House Mouse, Human,[5] Humpback Whale, Mallard, Meerkat, Mute Swan, Platypus, Red-tailed Hawk, Rock Pigeon, Scarlet Macaw, Southern Elephant Seal

United States

"Endangered" in relation to "threatened" under the ESA.
Under the Endangered Species Act in the United States, "endangered" is the more protected of the two categories. The Salt Creek tiger beetle (Cicindela nevadica lincolniana) is an example of an endangered subspecies protected under the ESA.

In the United States alone, the known species threatened with extinction is ten times higher than the number protected under the Endangered Species Act (Wilcove & Master, 2008, p. 414). The US Fish and Wildlife Service as well as the National Marine Fisheries Service are held responsible for classifying and protecting endangered species, yet, adding a particular species to the list is a long, controversial process and in reality it represents only a fraction of imperiled plant and animal life (Wilcove & Master, 2008, p. 414).

Some endangered species laws are controversial. Typical areas of controversy include: criteria for placing a species on the endangered species list, and criteria for removing a species from the list once its population has recovered; whether restrictions on land development constitute a "taking" of land by the government; the related question of whether private landowners should be compensated for the loss of uses of their lands; and obtaining reasonable exceptions to protection laws. Also lobbying from hunters and various industries like the petroleum industry, construction industry, and logging, has been an obstacle in establishing endangered species laws.

The Bush administration lifted a policy that required federal officials to consult a wildlife expert before taking actions that could damage endangered species. Under the Obama administration, this policy has been reinstated.[6]

Being listed as an endangered species can have negative effect since it could make a species more desirable for collectors and poachers.[7] This effect is potentially reducible, such as in China where commercially farmed turtles may be reducing some of the pressure to poach endangered species.[8]

Another problem with the listing species is its effect of inciting the use of the "shoot, shovel, and shut-up" method of clearing endangered species from an area of land. Some landowners currently may perceive a diminution in value for their land after finding an endangered animal on it. They have allegedly opted to silently kill and bury the animals or destroy habitat, thus removing the problem from their land, but at the same time further reducing the population of an endangered species.[9] The effectiveness of the Endangered Species Act, which coined the term "endangered species", has been questioned by business advocacy groups and their publications, but is nevertheless widely recognized as an effective recovery tool by wildlife scientists who work with the species. Nineteen species have been delisted and recovered[10] and 93% of listed species in the northeastern United States have a recovering or stable population.[11]

Currently, 1,556 known species in the world have been identified as endangered, or near extinction, and are under protection by government law (Glenn, 2006, Webpage). This approximation, however, does not take into consideration the number of species threatened with endangerment that are not included under the protection of such laws as the Endangered Species Act. According to NatureServe s global conservation status, approximately thirteen percent of vertebrates (excluding marine fish), seventeen percent of vascular plants, and six to eighteen percent of fungi are considered imperiled (Wilcove & Master, 2008, p. 415-416). Thus, in total, between seven and eighteen percent of the United States known animals, fungi, and plants are near extinction (Wilcove & Master, 2008, p. 416). This total is substantially more than the number of species protected under the Endangered Species Act in the United States.

NatureServe conservation status

NatureServe and its member programs and collaborators use a suite of factors to assess the conservation status of plant, animal, and fungal species, as well as ecological communities and systems. These assessments lead to the designation of a conservation status rank. For species these ranks provide an estimate of extinction risk, while for ecological communities and systems they provide an estimate of the risk of elimination. Conservation status ranks for how ecological systems in North America are currently under development.

Conservation status ranks are based on a one to five scale, ranging from critically imperiled (G1) to demonstrably secure (G5). Status is assessed and documented at three distinct geographic scales-global (G), national (N), and state/province (S). The numbers have the following meaning:

  • 1 = critically imperiled
  • 2 = imperiled
  • 3 = vulnerable
  • 4 = apparently secure
  • 5 = secure

For example, G1 would indicate that a species is critically imperiled across its entire range (i.e., globally). In this sense the species as a whole is regarded as being at very high risk of extinction. A rank of S3 would indicate the species is vulnerable and at moderate risk within a particular state or province, even though it may be more secure elsewhere.

Species and ecosystems are designated with either an "X" (presumed extinct or extirpated) if there is no expectation that they still survive, or an "H" (possibly extinct or extirpated) if they are known only from historical records but there is a chance they may still exist. Other variants and qualifiers are used to add information or indicate any range of uncertainty. See the following conservation status rank definitions for complete descriptions of ranks marlon. d and qualifiers.

For more information, view:

  • Interpreting NatureServe conservation status ranks[12]
  • Global, national, and subnational assessments[13]
  • Assessment criteria[14]
  • Relationship to other status designations[15]

Climate change

Before anthropogenic global warming species were subjected mainly to regional pressures, such as overhunting and habitat destruction. With the acceleration of anthropogenic global warming since the industrial revolution, climate change has begun to influence species safety. Nigel Stork, in the article Re-assessing Extinction Rate explains, the key cause of extinction being climate change, and in particular rising temperatures, rather than deforestation alone. Stork believes climate change is the major issue as to why species are becoming endangered. Stork claims rising temperature on a local and global level are making it harder for species to reproduce. As global warming continues, species are no longer able to survive and their kind starts to deteriorate. This is a repeating cycle that is starting to increase at a rapid rate because of climate change therefore landing many species on the endangered species list.[16]

Impact on biodiversity and endangered species

In order to conserve the biodiversity of the planet, one must take into consideration the reasons why so many species are becoming endangered. Habitat loss is the most widespread cause of species endangerment in the U.S., affecting 85% of imperiled species (Wilcove & Master, 2008, p. 416). When an animal s ecosystem is not maintained, they lose their home and are either forced to adapt to new surroundings or perish. Pollution is another factor that causes many species to become endangered. Also, over-exploitation, disease (Wilcove & Master, 2008, p. 416), and climate change (Kotiaho et al., 2005, p. 1963) have led to the endangerment of several species.

Humans have an impact on the species and their environment. As human use of resources, energy, and space intensified over the past few centuries, the diversity of life has been substantially diminished in most parts of the world (Ishwaran & Erdelen, 2006, p. 179).

Humans also set standards for which species they think should be saved and which species they find unimportant or undesirable. For example, the coqui frog, an invasive species in Hawaii, is so common there that its nocturnal singing reduces the value of homes and prevents hotels from using rooms near forests. Hawaiians have proposed eliminating the frog, and several wildlife managers want to release a pathogen to kill the frogs (Minteer & Collins, 2005, p. 333). The frog has decreased the value of homes and caused a loss of business for several hotels, so the Hawaiians decided it was acceptable to get rid of the group of coqui frog living near them.

Another example where the human impact affected the welfare of a species sex in the instance of non-native mute swans establishing themselves at Arrowhead Lake in Vermont. When the population of swans grew to eight birds, the Vermont Fish and Wildlife Department decided to take action. Two swans were eventually killed, angering animal welfare organizations and people living near the lake (Minteer & Collins, 2005, p. 333).

Yet another example of the human impact in the lives of endangered species is that of the Preble s meadow jumping mouse. Research has shown that the mouse is not taxonomically different from the Bear Lodge meadow jumping mouse and the US Fish and Wildlife Service has proposed removing the Preble s mouse from the endangered species list based on this information (Minteer & Collins, 2006, p. 333).

Importance of maintaining species

Diversity of life and living systems are a necessary condition for human development (Ishwaran & Erdelen, 2006, p. 179). Many question the importance of maintaining biodiversity in today s world, where conservation efforts prove costly and time consuming. Species should be saved for aesthetic and moral justifications; the importance of wild species as providers of products and services essential to human welfare; the value of particular species as indicators of environmental health or as keystone species crucial to the functioning of ecosystems; and the scientific breakthroughs that have come from the study of wild organisms (Wilcove & Master, 2008, p. 418). In other words, species serve as a source of art and entertainment, provide products such as medicine for human well-being, indicate the welfare of the overall environment and ecosystem, and provided research that resulted in scientific discoveries. An example of an aesthetic justification in conserving endangered species is that of the introduction of the gray wolf into Yellowstone National Park. The gray wolf has brought numerous amounts of tourists to the park and added to the biodiversity in the protected region (Wilcove & Master, 2008, p. 418).

Another example, supporting the conservation of endangered species as providers of products for human well-being, is the scrub mint. It has been found that the scrub mint contains an anti-fungal agent and a natural insecticide (Wilcove & Master, 2008, p. 418). Also, the deterioration of the bald eagle and the peregrine falcon alerted people to the potential health hazards associated with the widespread spraying of DDT and other persistent pesticides (Wilcove & Master, 2008, p. 418).

This serves as an example of how certain fish can serve as identifiers of environmental health and protect human life as well as other species. Finally, an example of species providing for scientific discoveries is the instance of the Pacific yew which became the source of taxol, one of the most potent anticancer compounds ever discovered (Wilcove & Master, 2008, p. 418-419). Endangered species could prove useful to human development, maintenance of biodiversity and preservation of ecosystems. Another approach is known as ecosystem conservation, where a focus is placed less on preserving any individual given species than on preserving the proper functioning of the ecosystem as a whole.[17]


It is the goal of conservationists to create and expand upon ways to preserve endangered species and maintain biodiversity. There are several ways in which one can aid in preserving the world s species who are nearing extinction. One such way is obtaining more information on different groups of species, especially invertebrates, fungi, and marine organisms, where sufficient data is lacking.

For example, to understand the causes of population declines and extinction an experiment was conducted on the butterfly population in Finland. In this analysis, the butterflies endangered list classification, distribution, density, larval specificity, dispersal ability, adult habitat breadth, flight period and body size were all recorded and examined to determine the threatened state of each species. It was found that the butterflies distribution has declined by fifty-one and a half percent, and they have a severely restricted habitat. One example of specific butterflies who have a declining distribution rate are the Frigga s Fritillary and Grizzled Skipper, who have been affected by habitat loss due to extensive draining of the bogs where they live (Kotiaho et al., 2005, p. 1963 1967). This experiment shows that when we know the causes of endangerment, we can successfully create solutions for the management of biodiversity.

Another way to help preserve endangered species is to create a new professional society dedicated to ecological ethics. This could help ecologists make ethical decisions in their research and management of biodiversity. Also, creating more awareness on environmental ethics can help encourage species preservation. Courses in ethics for students, and training programs for ecologists and biodiversity managers all could create environmental awareness and prevent violations of ethics in research and management (Minteer & Collins, 2005, p. 336). One final way in which one can conserve endangered species is through federal agency investments and protection enacted by the federal government. Ecologists have proposed biological corridors, biosphere reserves, ecosystem management, and ecoregional planning as approaches to integrate biodiversity conservation and socioeconomic development at increasingly larger spatial scales (Ishwaran & Erdelen, 2006, p. 179).

One example of a federal mandated conservation zone is the Northwest Hawaiian Islands Marine National Monument, the largest marine protected area in the world. The monument is essential to the preservation of underwater communities and overfished regions. Only researchers working in the area are permitted to fish, no corals may be removed, and the Department of Homeland Security will enforce restrictions on vessels passing through the waters via satellite imaging. The monument will serve as a home to an estimated seven thousand species, most of which cannot be found anywhere else in the world (Raloff, 2006, p. 92). This environmental monument demonstrates the fact that it is possible to create a safe environment for endangered species, as well as maintaining some of the world s largest ecosystems.

Captive breeding

Captive breeding is the process of breeding rare or endangered species in human controlled environments with restricted settings, such as wildlife preserves, zoos and other conservation facilities. Captive breeding is meant to save species from going extinct. It is supposed to stabilize the population of the species so it is no longer at risk for disappearing.[18]

This technique has been used with success for many species for some time, with probably the oldest known such instances of captive mating being attributed to menageries of European and Asian rulers, a case in point being the Pere David's Deer. However, captive breeding techniques are usually difficult to implement for highly mobile species like some migratory birds (e.g. cranes) and fishes (e.g. Hilsa). Additionally, if the captive breeding population is too small, inbreeding may occur due to a reduced gene pool; this may lead to the population lacking immunity to diseases.

Private farming

Whereas poaching causes substantial reductions in endangered animal populations, legal private farming for profit has the opposite effect. Legal private farming has caused substantial increases in the populations of both the southern black rhinoceros and the southern white rhinoceros. Dr Richard Emslie, a scientific officer at the IUCN, said of such programs, "Effective law enforcement has become much easier now that the animals are largely privately owned... We have been able to bring local communities into the conservation programmes. There are increasingly strong economic incentives attached to looking after rhinos rather than simply poaching: from eco-tourism or selling them on for a profit. So many owners are keeping them secure. The private sector has been key to helping our work."[19]

Conservation experts view the effect of China's turtle farming on the wild turtle populations of China and South-Eastern Asia many of which are endangered as "poorly understood".[20] While they commend the gradual replacement of wild-caught turtles with farm-raised turtles in the marketplace (the percentage of farm-raised individuals in the "visible" trade grew from around 30% in 2000 to around 70% in 2007),[21] they are concerned with the fact that a lot of wild animals are caught to provide farmers with breeding stock. As the conservation expert Peter Paul van Dijk noted, turtle farmers often believe in the superiority of wild-caught animals as the breeding stock, which may create an incentive for turtle hunters to seek and catch the very last remaining wild specimens of some endangered turtle species.[21]

In 2009, researchers in Australia managed for the first time to coax southern bluefin tuna to breed in landlocked tanks, opening up the possibility of using fish farming as a way to save the species from the problems of overfishing in the wild.[22]


Image:Urocyon littoralis full figure.jpg|The endangered island fox Image:Sea otter cropped.jpg|The endangered Sea Otter Image:Bison skull pile edit.jpg|American Bison skull heap. There were as few as 750 bison in 1890 from economic-driven overhunting. Image:California-condor.jpg|Immature California Condor File:Caretta caretta01.jpg|Loggerhead sea turtle Image:croceum.jpg|Santa Cruz Long-toed Salamander (photo courtesy of Don Roberson) Image:Arowana.jpg|An asian arowana File:Linces19.jpg|Iberian Lynx, Europe's most endangered mammal

See also

  • ARKive
  • Biodiversity
  • Critically Endangered
  • Endangered plants of Europe
  • Endangered Species Act
  • Endangered Species Coalition (ESC)
  • Ex-situ conservation
  • Extinction
  • Holocene extinction
  • Habitat fragmentation
  • Hawaiian honeycreeper conservation
  • In-situ conservation
  • IUCN Red List
  • IUCN Red List Critically Endangered species
  • IUCN Red List endangered animal species
  • The Last Paradises: On the Track of Rare Animals (1967 film)
  • List of endangered species in India
  • List of endangered species in North America
  • List of National Wildlife Refuges established for endangered species
  • Overexploitation
  • NatureServe conservation status
  • Rare species
  • Red Data Book of the Russian Federation
  • Red and Blue-listed
  • Threatened species
  • United States Fish and Wildlife Service list of endangered species
  • World Conference on Breeding Endangered Species in Captivity as an Aid to their Survival (WCBESCAS)
  • World Conservation Union (IUCN)
  • World Wide Fund for Nature



External links

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