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How can the use of DDT actually boost an insect population?
The selective use of DDT can kill off predators or parasites that control insect populations, leading to an increase in the target insect species. This disruption in the natural balance can result in a population surge.
How does the narrator in the top of the food chain first try to control the insect population of Borneo?
He sprays DDT.
When an insect eats plant matter that has been treated with DDT in which part of the insect would you expect the DDT to collect?
When an insect consumes plant matter treated with DDT, the chemical is likely to accumulate in its fat tissues. DDT is a lipophilic compound, meaning it tends to dissolve in fats rather than water, leading to bioaccumulation in the fat reserves of the insect. Over time, this accumulation can have toxic effects on the insect and can also impact predators that consume the insect.
How does the narrator in Top of the Food Chain first try to control the insect population of Borneo?
He sprays DDT.
The use of DDT to control insect pests is?
Banned in most countries now
How has the eagle population fared since DDT use was banned?
Since DDT was banned, the population of bald eagles has increased, and the species has been moved from the endangered list to the threatened list. The population increased by about 15% during the first ten years after DDT was banned.
What effects can a DDT ban have on the population of fish?
DDT is dangerous for all living beings; but also is a very good insecticide.
How did bald eagle get endangered?
Use of the pesticide DDT caused problems with thin eggshells that would break during incubation. The banning of this chemical allowed the bald eagle's numbers to rebound nicely, to where they are no longer an endangered species.
How can you stop the bald eagle to not be endangered?
The bald eagle is no longer considered an endangered species. The banning of the pesticide DDT, which caused the eagle's eggshells to be too thin to hatch, has saw the population rebound to the point where the bald eagle is now considered "Least Concern" by the IUCN.
What did the study in Pennsylvania forest reveal about the environmental effects of using DDT?
DDT killed ladybugs, which caused the aphid population to rise.
How did pesticide DDT threaten the population of the brown pelican?
DDT, a pesticide widely used in the mid-20th century, threatened the brown pelican population by causing eggshell thinning, which led to decreased hatching success. The chemical accumulated in the pelicans' bodies through the food chain, affecting their reproductive health. As a result, many eggs would crack or break before hatching, leading to a significant decline in their population. The use of DDT was eventually banned in the U.S. in 1972, helping the brown pelican population to recover over time.
What problems did buildup of DDT in adult bald eagles cause?
In the 1940-1950's, DDT was used on crops to control pests. The DDT entered the water and was absorbed into the food chain of the Eagle. DDT would then enter the Eagle's systemm and it would cause them to lay eggs that had weak shells. The shell would break before the eaglet had time to hatch, thus reducing the population and threatening their extinction.
