Endangered species

1、Endangered species endangered, critically tiger that is The Siberian Tiger is a subspecies of 1 3 subspecies of tiger are already extinct. Conservation statusRisk of extinction Extinction Extinct in the Wild Extinct Threatened Critically Endangered EndangeredVulnerable Threatened Lower risk Conserva

2、tion Dependent Near Threatened Least Concern See also World Conservation Union IUCN Red List an organism which is at risk of is a population of An endangered speciesbecoming extinct because it is either few in numbers, or threatened by is species An endangered environmental or predation parameters.

3、changing significant another evolutionary species, but may be usually a taxonomic unit. The World Conservation Union (IUCN) has calculated the percentage on the sample all organisms based of of endangered species as 40 percent 2groups IUCN (Note: evaluated been through 2019.the species of that have

4、laws have Many summary purposes.) nations for all threatened species their offering protection to these species: for example, forbidding hunting, many the a Only few of preserves. or land restricting development creating species at risk of extinction actually make it to the lists and obtain legal pr

5、otection. Many more species become extinct, or potentially will become extinct, without gaining public notice. 页 1 第Conservation status The conservation status of a species is an indicator of the likelihood account taken into living. Many factors are endangered of that species not number the a of sp

6、ecies; not simply when assessing the conservation status remaining, but the overall increase or decrease in the population over List Red so on. The IUCN time, breeding success rates, known threats, and is the best known conservation status listing. Internationally, 190 countries have signed an accor

7、d 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 Endangered species category specific refers to a Red Endangered species under the IUCN List of threatened species

8、, and may include critically endangered species. endangered speciesIUCN Red List of Threatened Species as uses the term Under term. a general imperilment, category of rather than as a specific endangered species is between the IUCN Categories and Criteria, endangeredcritically endangeredvulnerablecr

9、itically species and . Also endangered species and fill all the criteria may also be counted as The more general term used by the IUCN for species at risk of extinction threatened species, which also includes the less-at-risk category of is vulnerable species together with endangered and critically

10、endangered. IUCN categories include: : the last remaining member of the species has died, or is Extinct ?Thylacine, died. Examples: presumed beyond reasonable doubt to have Dodo, Passenger Pigeon : captive individuals survive, but there is no Extinct in the wild ?free-living, natural population. Exa

11、mples:South China Tiger, Alagoas Curassow an extremely high risk of extinction Critically endangered: faces ?in the immediate future. Examples: Arakan Forest Turtle, Javan Rhino, Brazilian Merganser future. the near in of high a : Endangeredfaces very risk extinction ?Examples: Blue Whale, Snow Leop

12、ard, African Wild Dog, Tiger, Albatross, Crowned Solitary Eagle 页 2 第: faces a high risk of extinction in the medium-term. Vulnerable ?Examples: Cheetah, Gaur, Lion, Wolverine : The following animal is not severely Conservation Dependent ?threatened, but the animal must depend on conservation progra

13、ms. Examples: Spotted Hyena, Leopard Shark, Black Caiman : may be considered threatened in the near future. Near Threatened ?Examples: Blue-billed Duck, Solitary Eagle, Small-clawed Otter , Maned Wolf species. the survival of : Least Concernno immediate threat to the ?Examples: Brown Rat, Nootka Cyp

14、ress, Wood Pigeon United States Endangered in relation to hreatened 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 pro

15、tected under the ESA. with threatened species “number of known In the United States alone, the extinction is ten times higher than the number protected under the Endangered Species Act” (Wilcove & Master, 2019, p. 414). The US Fish are Service National Marine Fisheries Wildlife Service as well as th

16、e and yet, species, protecting endangered held responsible for classifying and process long, controversial list to the is a adding a particular species animal and plant fraction of imperiled reality and in it represents only a life (Wilcove & Master, 2019, p. 414). Some endangered species laws are c

17、ontroversial. Typical areas of controversy include: criteria for placing a species on the endangered once its from the list species list, and criteria for removing a species population has recovered; whether restrictions on land development of related question by land the government; the a constitut

18、e aking of of uses the loss of compensated private whether landowners should be for their lands; and obtaining reasonable exceptions to protection laws. Being listed as an endangered species can have negative effect since it 3 This could make a species more desirable for collectors and poachers.effe

19、ct is potentially reducible, such as in China where commercially farmed turtles may be reducing some of the pressure to poach endangered 4 species. 页 3 第Another problem with listing species is its effect of inciting the use species endangered method of clearing of the shoot, shovel, and shut-up dimi

20、nution a currently may perceive an area of land. Some landowners from 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 same time their land, but at the habitat, thus removing the problem from 5 The further re

21、ducing the population of an endangered species.effectiveness of the Endangered Species Act, which coined the term and groups business advocacy species, has been questioned by endangered effective an recognized as but is nevertheless widely publications, their Nineteen the species. with wildlife scie

22、ntists who work recovery tool by 6 and 93% of listed species in species have been delisted and recovered7 stable population.have a recovering or the northeastern United States Currently, 1,556 known species in the world have been identified as endangered, or near extinction, and are under protection

23、 by government law (Glenn, 2019, Webpage). This approximation, however, does not take into consideration the number of species threatened with endangerment Endangered the laws of such as that are not included under the protection ion status, Species Act. According to NatureServes global conservatapp

24、roximately thirteen percent of vertebrates (excluding marine fish), fungi of to eighteen percent of vascular plants, and six percent seventeen are considered imperiled (Wilcove & Master, 2019, p. 415-416). Thus, in ighteen percent of the United States known total, between seven and eanimals, fungi,

25、and plants are near extinction (Wilcove & Master, 2019, p. 416). This total is substantially more than the number of species protected under the Endangered Species Act in the United States, which means numerous species are inching closer and closer toward extinction. Question of ethics about these s

26、pecies, many ecologists do more Even in the search to learn and the environment impact they leave on take not into consideration the knowledge, ecological the “quest for that its inhabitants. It is apparent which is so critical for informing efforts to understand and conserve Earths biodiversity alo

27、ng with valued ecosystem goods and services, 8 and there is no clear frequently raises complex ethical questions”,focus tend to these and resolve issues. Environmentalists to way identify on the whole ecological sphere instead of the welfare of individual each value of diminish broad a view tends to

28、 the such Focusing animals. on sity conservation is currently a individual creature. “Biodiverprinciple goal for resource management of 11.5% of the worlds surface 9areas and Large portions of life occur outside these protected area.” 页 4 第species endangered conservation of taken into consideration

29、if the be must is going to be effective. 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. species endangerment in “Habitat loss is the most widespread cause oft

30、he U.S., affecting 85% of imperiled species” (Wilcove & Master, 2019, p. 416). When an animals ecosystem is not maintained, they lose their home and are either forced to adapt to new surroundings or perish. endangered, become species to factor that causes many Pollution is another especially a large

31、 proportion of aquatic life. Also, overexploitation, et change (Kotiaho p. 416), and climate (Wilcove disease & Master, 2019, al., 2019, p. 1963) have led to the endangerment of several species. However, the most important factor leading to the endangerment of the majority of wildlife in the world i

32、s the human 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 Erdelen, (Ishwaran & of the world” substantially diminished in most parts increases, environment impact on the human 2019, p.

33、179). Basically, as the resources the are constantly using the diversity of life decreases. Humans and space of other species for themselves, negatively impacting the survival rate of many creatures. saved be think should standards for which species they Humans have also set and which species they f

34、ind unimportant. For example, the coqui frog in i is so common that its “nocturnal singing” reduces the value of Hawaihomes 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 (Min

35、teer & Collins, 2019, p. 333). This example of the coqui frog demonstrates how humans have no consideration for the life of another species, and are more concerned about their own contentment and personal gain. The frog decreased the value of homes and lost business for several hotels, so the Hawaii

36、ans figured it was acceptable to get rid of the group of coqui frog living of impact consideration into the environmental near them, without taking destroying the species. species a welfare of the human impact affected the where Another example was in the instance of non-native mute swans establishi

37、ng themselves at birds, eight swans grew to the Lake Arrowhead in Vermont. When population of Two take action. kill decided Wildlife Fish the Vermont and Department to 页 5 第swans were eventually killed, angering animal welfare organizations and people living near the lake (Minteer & Collins, 2019, p

38、. 333). The case of the Arrowhead Lake swans demonstrates what one considers the natural not swans were Simply because the environment based on human assumptions. habitat, their natural not part of there does not mean it is normally living human of be destroyed because certainly no reason for them t

39、o and there is of lives impact in the another example of the human dissatisfaction. Yet ered species is that of the Prebles meadow jumping mouse.endangthe from taxonomically different that the mouse is not has Research shown Wildlife Service has US Fish and Bear Lodge meadow jumping mouse and the ng

40、ered species list proposed removing the Prebles mouse from the endaexample This p. 333). (Minteer & Collins, 2019, based on this information brings into consideration the role of science in determining the maintenance of a species. It brings into questions whether scientific evidence should be the o

41、nly resource used to support conservation of is on existing species of the human impact biodiversity. A final example the issue of toe clipping in ecological research. While ecologists are methods knowledge of to advance their species doing research on different of conservation, they must take into

42、consideration the impact they have on the wildlife they are studying. effects adverse a number of in clipping “has been reported to result Toe on the animals, including inflammation and infection of the feet and how demonstrates 334). This example (Minteer & Collins, 2019, p. bs” limhumans must take

43、 into consideration the wellbeing of the animal even before they perform research to help conserve the species. The human impact on species and their environments has many negative effects. It not world and the maintain all species in for is important humans to help deter their development. Species

44、maintaining importance human condition for are a necessary life “Diversity of and living systems en, 2019, p.179). Many question the development” (Ishwaran & Erdelimportance of maintaining biodiversity in todays world, where conservation efforts prove costly and time consuming. The fact is that Spec

45、ies survival. for human of preservation all species is necessary the importance the moral “aesthetic and justifications; ed should be savfor human to services of products and essential providers species of wild as welfare; the value of particular species as indicators of environmental health or as k

46、eystone species crucial to the functioning of ecosystems; and the scientific breakthroughs that have come from the study of wild organisms” (Wilcove & Master, 2019, p. 418). In other words, species 页 6 第serve as a source of art and entertainment, provide products such as medicine for human wellbeing

47、, indicate the welfare of the overall environment and ecosystem, and provided research that resulted in “aesthetic justification” in scientific discoveries. An example of an wolf gray of the the species is that of introduction conserving endangered amounts numerous has brought National Park. The gra

48、y wolf into Yellowstone of tourists to the park and added to the biodiversity in the protected region (Wilcove & Master, 2019, p. 418). Another example, supporting the conservation of endangered species as been has mint. It wellbeing, is the scrub providers of products for human found that the scrub

49、 mint contains an antifungal agent and a natural of the deterioration 2019, p. 418). Also, insecticide (Wilcove & Master, potential to the “alerted people and the bald eagle the peregrine falcon health hazards associated with the widespread spraying of DDT and other persistent pesticides” (Wilcove &

50、 Master, 2019, p. 418).identifiers as species can serve an serves as example of how certain This species. other well as life health and protect human as of environmental Finally, an example of species providing for scientific discoveries is the instance of the Pacific yew which “became the source of

51、 taxol, one & of the most potent anticancer compounds ever discovered” (Wilcove human useful to could 418-419). Endangered species prove Master, 2019, p. ecosystems. preservation of maintenance of biodiversity and development, Many endangered species serve to better humanity; therefore humanity shou

52、ld serve to better endangered species.Some of the negative behavior of annimals is caused by abuse Helping preserve endangered species It is the goal of conservationists to create and expand upon ways to preserve endangered species and maintain biodiversity. Everyone should can one in which way. som

53、e There are several ways a be conservationist in aid in preserving the worlds species who are nearing extinction. One such way is obtaining more information on different groups of species, sufficient where organisms, fungi, and marine invertebrates, especially data is lacking. For example, to unders

54、tand 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

55、 were all species. of each state the to and recorded examined determine threatened 页 7 第-one fiftydeclined by the butterflies distribution has It was found that and a half percent, and they have a severely restricted habitat. One example of specific butterflies who have a declining distribution rate

56、 affected have been and Grizzled Skipper, who are the Friggas Fritillary by habitat loss due to extensive draining of the bogs where they live (Kotiaho et al., 2019, p. 1963-1967). This experiment proves that when solutions successfully create endangerment, we can we know the causes of for the management of biodiversity. An