habitat destruction notecards


Terms in this set (...)

Destruction statistics
The United States makes up less than 5 percent of the population on earth, yet we easily consume over 30 percent of its resources.
This can result in changes in seed-dispersal and pollination patterns, breeding ground size reduction, isolated fragments of ecosystems, and wildlife migration route disruption.
When mining is not managed well the surface of an ecosystem can be destroyed, underground material can be introduced into a habitat, and when these materials are rained on a runoff containing high concentrations of metal ore or highly runoff that is highly acidic can be created and these are incredibly toxic to aquatic species.
Non-Native Species Introduction
When habitats are destroyed exotic species can become introduced into the habitat. This can result in competition with native species, change in vegetation, and the native species being preyed on. This can result in native
Pollution has several threatening effects on habitats. Acid rain is a major threat and can lead to the destruction of lakes, forests, and streams, lower the pH of lakes and streams to the point that some fish can die or not be able to produce, as well as damage fish or other organisms when acid rain introduces certain metallic elements to water supplies.
Fire Suppression
Fire can restore the natural balance of an ecosystem, or habitat. Many species of plants need fire in order for their seeds to release. It also helps to prevent the accumulation of underbrush. Though, fires must be handled judiciously to protect property and life, they can be beneficial in restoring the natural balance of a habitat or ecosystem.
Off-road vehicles pose one of the biggest threats to a habitat. They can speed up soil erosion and compaction, vegetation destruction, and air and water pollution. Other recreational activities can also cause problems, such as backpacking and hiking, but these are generally less harmful, but not completely harmless.
stats of hab. loss
According to a study conducted by the National Forest Service, habitat destruction is the leading cause of endangered species. It threatens approximately 80 percent of federally listed species.
stats of habitat loss
approximately 14 to 17 percent of species were affected by logging, 29 to 33 percent were affected by water development, 14 to 21 percent were affected by mining, 19 to 22 percent were affected by grazing, and 23 to 26 percent were affected by recreation.
Habitat destruction is the process by which natural habitat is damaged or destroyed to such an extent that it no longer is capable of supporting the species and ecological communities that naturally occur there. It often results in the extinction of species and, as a result, the loss of boidiversity.
Habitat loss statistics
A recent major study indicates that if global temperatures increase 1.8-2° Celsius (3.2-3.6°F), which is considered amid-range estimate, a million species would be threatened with extinction over the next fifty years
Forest Destruction
Canada contains over a third of the world's boreal forest, one-fifth of the world's temperate rainforest and one-tenth of the total global forest cover. Yet research shows that right now over 80 percent of the logging carried out in public forests is done by clearcutting, a method of harvesting timber where all trees are cut in a prescribed area. This can cause major problems with erosion, as well as the loss of sensitive plant species.
Habitat loss statistics
About half of the forests that once covered the earth are now gone
habitat loss statistics
One-third of the world's natural resources have been used up in the last 30 years.
time v extinction statistics
Every 20 minutes, the world adds another 3,500 human lives but loses one or more entire species of animal or plant life - at
least 27,000 species per year. (Source: PBS
extinction rate statistics
At the present rates of extinction, as many as 20% of the world's 7-15 million species could be gone in the next 30 years.
This rate of extinction has been unprecedented since the disappearance of dinosaurs 65 million years ago (Source: WWF)
human v animal statistics
The hourly destruction of an estimated 240 acres of natural habitat is directly attributable to the growth in human populations.
specified endangered animal statistics
Where there were once over 100,000 black rhinos on the plains of Africa, there are now only 2,707 on the entire continent.
water and its affects on species
Dams and other water diversions siphon off and disconnect waters, changing hydrology and water chemistry (when nutrients are not able to flow downstream). During the dry season, the Colorado River has little to no water in it by the time it reaches the Sea of Cortez.
global warming
Global warming is the emerging driver of habitat loss. Wildlife that need the cool temperatures of high elevations, such as the American pika, may soon run out of habitat. Coastal wildlife may find their habitat underwater as sea levels rise.
Around half of the world's original forests have disappeared, and they are still being removed at a rate 10x higher than any possible level of regrowth.
In 1994, it was estimated that 37% of the global population lived within 60 km of the coast. Poverty, consumption and land-use patterns contribute to the degradation of marine habitats and to the destruction of the species that rely on them to survive.
Why is it important?
It is important because it is itrinsic value to maintain these sorts of animals. It is also important because biodiversity is adds great diversity to the world, which is a good thing. Also no animal should become extinct at the expense of another.
biodiversity benefits
Biodiversity adds both agricultural and economic benefits, due to its ecotourism value.
What you can do
Visit a national, state or local park where resident naturalists describe local ecosystems. Look into volunteer activities at these locations. Attend public hearings concerning land and water use decisions. Regional planning Councils, water management districts, and county and city commissions are all charged with the responsibility of making decisions affecting biological diversity. Become informed, then involved. Report violations of conservation laws to federal and state authorities
north carolina stats
Running parallel to this increase in population is drastic wildlife habitat loss across the region. From 1982 to 1997, North Carolina lost 1,001,000 acres or 5.9 percent of its total forest area to land conversion related to population growth and urbanization. Researchers predict an additional loss of 5.5 million forested acres in North Carolina by 2040.
the purpose and affects of deforistation
Areas cleared of forest to make room for buildings and neighborhoods are replanted with a very limited variety of exotic plants. These landscaped areas are poor quality habitat because they contain low plant diversity, few native plants, and poor plant structure. Bird and butterfly species that require habitats containing a diversity of native plants cannot sustain their populations in these typical landscapes
united states decline
Number of Animal species that have gone extinct 801
what is causing it?
Perhaps the most devastating of all habitat-altering agents, however, is climate change. Scientists are still coming to grips with the consequences that excessive atmospheric carbon dioxide and Earth's rapid warming are having on ecosystems. But there is ample evidence indicating that the oceans are bearing the brunt of these changes.
specific animal stats
South Asian River Dolphin (Platanista gangetica)
Population: Fewer than 1,000. Status: Endangered Species.
Trend: Decreasing due to dams, water projects and water pollution.
specific animal stats
Common Chimpanzee (Pan troglodytes)
Population: Between 150,000 and 250,000. Status: Endangered Species
Trends: Declining Rapidly due to habitat loss and illegal hunting. Chimps are used for food in Africa. An estimated 1 million to 2 million chimps lived in African forests a century ago.
specific animal stats
Polar Bear (Ursus maritimus)
Population: 20,000 to 25,000 Status: Threatened Species
Trends: Very likely declining due to habitat loss brought on by climate-change-induced melting of Arctic sea ice and shelf ice.
specific animal stats
Giant Panda (Ailuropoda melanoleuca)
Population: 1,000 to 2,000 in the wild. Status: Endangered Species
Trends: Still decreasing due to habitat loss
A species is defined as endangered or threatened when it is compared against these five factors:
Damage to or destruction of its habitat
Overuse of the species for educational, recreational, or entertainment purposes
Disease or predation of the species
Lack of protection
Natural or manmade hazards to the continued life of the species
A species is declared extinct after many years of not being spotted. Because it takes so long to define an entire species as extinct, it is probable that there are many species already gone that we are unaware of.
threatened v endangered
A threatened species is one that is vulnerable of becoming endangered in the near future.
what are they
An endangered species is one whose numbers are so small that it is at risk of extinction.
where they live
As estimated 50 percent of all endangered species live in the rainforest. The planet's largest rainforest -The Amazon - lost more than 17 percent of its forest cover in the last century due to human activity.
freshwater habitats
Freshwater ecosystems are home to more than 100,000 known species of plants and animals, and are now one of the most endangered habitats in the world as a result of human development, pollution, and climate change.
United states habitat stats
18 U.S. animal species are currently proposed for listing.
46 U.S. plant species are currently proposed for listing.
natural ecosystem
Natural systems are extremely complex and knowledge about how they function is quite limited. However, the importance of a wide variety of species, some of which perform apparently "redundant" functions, is beginning to emerge. Preserving natural habitat therefore preserves biodiversity, and acts like a "savings fund" for the earth and for our future needs.
what you can do
Learn more about the natural habitats in your area, and help to educate others about their importance. Sources of local information include community stewardship groups, nature centres and online atlases and mapping tools (see More Information).
united states stats
more than 85 percent of forested habitats in the UNited states have been permanently destroyed due to logging.
united states stats
Two out of every three woodland
species in the central United States
have declined in abundance during the
past 30 years
united states stats
Ninety-nine percent of the original
forests in the eastern United States have
been cut, and the forests that regenerate
or are replanted are often of lower
quality for Neotropical migratory birds