Free Study Guide for Silent Spring by Rachel Carson - Book Summary
This is the last page of the
free study guide for "Silent Spring".
Spraying is not the only solution to the problems of forest insects that become overpopulated. Natural parasitism can be used, a method of finding the insect that is the enemy of the targeted insect and introducing them into the forest. Microorganisms can be introduced which will serve as diseases to the targeted insects and thus kill them off naturally.
The pesticide threat to fish can be divided into three parts. The first involves the fish of the running streams of the northern forests and the single problem of forest spraying. The second involves many different kinds of fish that inhabit both flowing and still waters all over the country. It also involves the wide use of insecticides for many agricultural uses. The third problem involves what is to be expected in the future. This problem involves the fish of the salt marshes, the bays, and the estuaries.
The use of the new organic pesticides guarantees the death of fish. Fish are "fantastically sensitive to the chlorinated hydrocarbons that make up the bulk of modern insecticides." Reports of massive fish kills have become common. 25 million Americans are involved in the fishing industry. 15 million Americans are casual anglers.
The mass destruction of fish resulting in agricultural spraying is visible everywhere. In California, 60,000 game fish were killed following a control operation. In Louisiana, more than thirty instances of heavy fish kill were reported in one year. In Pennsylvania, fish have been killed in large numbers. In the Southern U.S. the control operations against the fire ant have used Dieldrin, a chemical with a well-documented history of extreme hazard to water life. Heptachlor is also widely used against fire ants. Fish have been found with Heptachlor in their tissues. The destruction of fish, frogs and other life was so great that the American Society of Ichthyologists and Herpetologists called on the Department of Agriculture to stop spraying Heptachlor, Dieldrin, and other poisons. The campaign to save cotton crops from insects has also caused a great deal of destruction. In 1950, 80-95 percent of farmers were urged by the government to use insecticides, especially one called Toxaphene, a chemical extremely dangerous to fish. That summer saw heavy rains. The poison washed into the waterways and killed huge amounts of water life.
Farm ponds become death traps when farmers are encouraged to apply heavy doses of insecticides to their land. the poison is carried in by rains and run-off. Crop-dusting pilots donít turn off the sprayers when they fly over bodies of water. Even if farmers applied much less insecticides, the problem would remain. The problem with farm ponds and lakes is that farmers typically repeat spraying every year. The chemicals build up; they donít go away.
In many parts f the world, ponds are used to grow fish that are indispensable as a food source. In Rhodesia, even small doses of DDT and other insecticides have proven to kill all the life of fishponds. In the Philippines, China, Vietnam, Thailand, Indonesia, and India, the problem of insecticide poisoning of fishponds causes immediate and severe reductions of the food supplies. No method has proven effective in purifying a pond after itís been exposed to insecticides.
One of the worst fish kills occurred in the Colorado River below Austin, Texas. In 1961, dead fish appeared in Town Lake in the center of Austin. Then there were reports of dead fish fifty miles downstream. A wave of poison was moving downstream. A month later, dead fish were reported 100 miles downstream in La Grange, Texas. A week later, dead fish were reported 200 miles south. Officials closed the locks on the Intracoastal Waterway in order to keep toxins from flowing into the Matagorda Bay and divert them into the Gulf of Mexico.
Officials in Austin found a plant that was leaking chemicals. It had been producing DDT, Benzene Hexachloride, Chlordane, and Toxaphene, among other chemicals. The plant manger admitted that the insecticide had been washed into the storm sewer recently. He also admitted that the plant had been dumping insecticide spillage for the past ten years. Fishery officers found other plants like this one. The Game and Fish Commission predicted that even if there were no further pollution, the pattern of fish population of the river would be impeded for years to come. No one knows what will happen to the Gulf of Mexico which received all those toxins.
No one knows the long-term effect of insecticide poisoning of estuaries, salt marshes, bays and other coastal waters. On the eastern coast of Florida, in the Indian River country, 2,000 acres of salt marsh were treated with Dieldrin to kill the larvae of the sandfly. The campaign resulted in disaster. The State Board of Health reported the results. Dead fish were everywhere. In the water, sharks could be seen eating the masses of dead fish. All species living in the area were severely damaged. Another case of insecticide poisoning occurred on the opposite coast of Florida where the National Audubon Society operates a sanctuary for sea birds. A campaign to kill the source of mosquitoes ended up killing huge numbers of fish and crabs. The fiddler crab was especially affected. The fiddler crab is an important food source for many animals, from raccoons to birds.
Inshore waters have an extremely important place in the overall ecology. Fish use these waters as safe places for breeding and spawning. Shrimp also use these areas for their young. Shrimp are extraordinarily sensitive to insecticides. The threat to oysters and clams is even greater. They live on the bottoms of bays and sounds and tidal rivers. Pesticides kill the plankton that they feed on.
There is much ignorance in regards to chemical poisoning of waterways. Itís unknown how many chemicals are poisoning bodies of water and waterways or what their combinations will produce. We donít know what kinds of changes these chemicals undergo in their long transit from the land to the ground water to the waterways to the oceans. The fisheries of the fresh and salt water are invaluable resources. We should divert some of the money from the development of ever more toxic compounds to the study of the effects of these chemicals and to the study of natural and non-toxic solutions to the problems we face.
The urgency of Carsonís appeal is further established in this chapter on the waters of the world. The dominant note of the chapter is voiced at its end. Scientists donít know what the affects of all this poison will be in the future. They donít have any way to measure what the chemicals are when theyíve passed through their primary use and have traveled through the water, mixing with other chemicals, to reach the ocean. They are seriously under funded in their efforts to find out and at the same time, chemical research money goes to the development of more and more toxic chemicals.
This is the last page of the free study guide for "Silent Spring".
The complete study guide is currently available as a downloadable PDF, RTF, or MS Word DOC file from the PinkMonkey MonkeyNotes download store. The complete study guide contains summaries and notes for all of the chapters; detailed analysis of the themes, plot structure, and characters; important quotations and analysis; detailed analysis of symbolism, motifs, and imagery; a key facts summary; detailed analysis of the use of foreshadowing and irony; a multiple-choice quiz, and suggested book report ideas and essay topics.
All Content Copyright©TheBestNotes. All Rights Reserved.
No further distribution without written consent.
10632 Users Online | This page has been viewed 10123 times
This page was last updated on 5/9/2017 9:50:55 AM
Cite this page:
TheBestNotes.com Staff. "TheBestNotes on Silent Spring".
. 09 May 2017