why do plants and animals become endangered
Many species of Hawaiian honeycreepers have persisted into the 20th century because high elevation rain forests on the islands of KauaБi, Maui, and Hawai'i are cool enough to limit transmission of introduced avian malaria (Plasmodium relictum). Malaria transmission is tied closely to the effects of temperature on development of malarial parasites within their mosquito vectors and the effects of temperature and rainfall on seasonal and altitudinal changes in mosquito populations. As a result, this system may be very sensitive to recently documented increases in mean temperature in the Hawaiian Islands. USGS scientists have documented recent dramatic increases in avian malaria on the Alaka'i plateau on Kaua'i that could affect recovery of two endangered honeycreepers, the 'Akikiki (Kaua'i Creeper, Oreomystis bairdi) and 'Akeke'e (Kaua'i 'Akepa, Loxops caeruleirostris), and one endangered thrush, the Puaiohi (Small Kauai Thrush, Myadestes palmeri).
Today, many of us are aware that certain animals, such as and, are endangered species.
What many might not realize, though, is that the endangered species list contains thousands of species, and they're not all animals. Indeed, many of the species you'll find on the list are! is the complete disappearance of a species from Earth. are good examples of animals that are extinct and no longer roam Earth. Animals and plants that are at risk of becoming extinct because of threats from changing environments or are considered threatened or endangered. An "endangered" species is any species in danger of through all or a significant portion of its. A "threatened" species is any species that is likely to become an endangered species within the future. The International Union for Conservation of Nature (IUCN) keeps track of endangered species around the world. As of 2006, the IUCN estimates that up to 40 percent of all organisms are endangered. Thanks to concerned citizens and scientists worldwide, many nations have passed laws to protect and endangered species. Some laws forbid hunting, while others land development or create special preserves as endangered species habitats.
Unfortunately, not all endangered species obtain protection via special conservation laws. In fact, conservationists believe only a very few of the many threatened species benefit from protective laws, while many more species face the of without the public taking notice. In the United States, researchers believe the number of species threatened with is 10 times greater than the number protected under the Endangered Species Act. Some believe that governments have made it too hard for a threatened species to be added to the official list of endangered species in order to receive special protection. Although any person can ask the government to list a species as threatened or endangered, the listing process can take more than two years to complete. Scientists must establish the conservation of a species, which is an of the chance of a species not living. Researchers must take many factors into account, such as the number remaining, the decrease in population over time, breeding rates, environmental and predatory threats, to name a few.
Despite these challenges, progress has been made. More than 195 countries around the world have signed an accord, agreeing to create action plans to protect endangered and other threatened species. In the United States, these plans are usually called "species recovery plans" and are developed according to guidelines in the Endangered Species Act. Experts with the Fish and Wildlife Service's Recovery Program design recovery plans to reverse the decline of threatened or endangered species. Overall, the Endangered Species Act has been widely recognized by wildlife scientists as an effective tool in the battle against. Supporters of the Endangered Species Act believe it has been very successful in slowing the decline of threatened and endangered species. For example, 19 species have been delisted and recovered, and 93 percent of listed species in the northeastern part of the country have a recovering or stable population.
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