thanks for this lesson.
Usted ha añadido cursos libres de propaganda a su carrito de compras. Ahora solo páguelo para disfrutar de todos los cursos sin propagandaVaya al carrito
thanks for this lesson.
the major effect of noise population to animals
why should we replace lead shots with the steel shot.
Explica muy bien los efectos sobre la vida silvestre
la salud humana es muy importante pero al momento de contaminar parece que esta no es importante debido que los humanos contaminamos mucho el ambiente con productos que llegan a la atmósfera. aumentando así la temperatura en la atmósfera contribuyendo así al debilitamiento de la capa de ozono. el plomo es un toxico muy usado desde la antigüedad, afortunadamente este se sustituye por el acero.
muy buena lección.
Wild life balance the ecosystem we have to protect this animals.
What is Geo engineering?
What is poaching?
Development of infrastructures such as bridges and barrages in developing countries such as Malawi have polluted water bodies due to lack of regard of the environment. most rivers are heavily sedimented.
Not unreasonably, we tend to be most concerned by the impact of pollution on human health and interests. However, there is growing documentation of the harm pollution is inflicting on wildlife. The following are just a small sample.
The pesticide DDT was banned in the U.S. in 1972 because it caused raptor eggs to thin and break. But residual DDT and other persistent organochlorine pesticides continue to impact wildlife today. Additionally, DDT is still used in many other countries as the most effective control of malaria-bearing mosquitoes.
Prescription drugs, caffeine, and other medications can pass through both the human body and sewage treatment facilities, and are now present in many waterways. Some of these may be toxic to aquatic life. Others, especially steroids, estrogen, testosterone and similar regulatory hormones, are likely to interfere with the development of organisms.
When hunters shoot animals with lead shot, but do not recover the dead or injured animals, the shot is eventually ingested by other wildlife. The lead is concentrated as it passes up the food chain, and the top predators, especially raptors, get lead poisoning. Many states now require the use of steel shot. Mining wastes also release toxic levels of substances like lead and mercury into waterways.
Acid rain and snow is produced from the burning of high-sulfur coals in electrical power plants. Acid mine run-off is caused by the reaction of rainwater with mine tailings. Acidification can sterilize water bodies, killing off all aquatic flora and fauna. When wildfowl and other wildlife ingest this water, they can be poisoned by heavy metals.
Dioxin is generated by burning wastes and in the production of some papers and plastics. It accumulates in animal fats and concentrates up the food chain, and has been linked to cancers and reproductive issues in a number of species.
Oil spills have immediate devastating effects - marine mammals and waterfowl coated with oil drown, are poisoned, or die of hypothermia. Balls of oil that sink to the sea-floor can smother organisms. Less obvious effects include tumors and reproductive damage in fishes and crustaceans caused by oil byproducts.
Chronic noise pollution from low-flying aircraft, snowmobiles, motorcycles, and traffic can cause wildlife to abandon habitats, lose reproductive function, and become more vulnerable to predation due to loss of hearing. Light pollution at night disorients bats, insects, and migratory birds.
Eutrophication results from the addition of enriching agents - detergents, fertilizers, and organic wastes - to water bodies. Explosive growth and subsequent decay of algae use up available oxygen, which in turn suffocates aquatic animals and plants. The change in water chemistry can also drive out native species.
Sediments eroded during construction or agricultural practices are washed into waterways, damaging fish spawning grounds and smothering bottom dwelling organisms.