Download or read book Effects of DDT and Other Insecticides on Fish and Wildlife written by Joseph Paul Linduska and published by . This book was released on 1948 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of DDT on Birds and Fish written by Julian Geoffrey Nicholson Pepperell and published by . This book was released on 1975 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Effects of DDT on the Guppy and the Brown Trout written by Susan Frances King and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Editor's note: This paper was prepared under the direction of Assistant Professor Kathryn M. Eschenberg, Mount Holyoke College and was accepted by the Faculty in partial fulfillment of the requirements for the degree of Bachelor of Arts with Honor, 1961. Despite certain limitations, described below, the paper (somewhat condensed from the original) has been accepted for publication because (1) it is an unusual and excellent study by an undergraduate, and (2) so little information is available on the subject treated. Biometricians may criticize the paper from the standpoint of small numbers and need for replication. One reviewer says: "One of the most interesting observations related to the apparent increase in resistance following exposure to effectively sublethal levels. Part of the increase, but likely only part, was due to the previous selective killing of weaker individuals. Good experimental procedure would require that this test be repeated, with parallel series of previously unexposed fish....There is need for a replicated study of numbers of young born to guppies held in DDT, especially because the numbers are so small." It is the Editor's hope that the limitations of the paper may stimulate further work in this important area.
Download or read book Insecticide Residues in Fish eating Birds and Their Environments written by James O. Keith and published by . This book was released on 1968 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Various Concentrations of DDT on Several Species of Fish of Different Sizes written by Eugene Wicker Surber and published by . This book was released on 1949 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of D D T and Other Insecticides on Fish and Wildlife written by Joseph P. Linduska and published by . This book was released on 1948 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Chronic Effects of DDT on Cutthroat Trout written by Donald T. Allison and published by . This book was released on 1964 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects on cutthroat trout (Salmo clarki lewisi) of periodic exposure to different levels of DDT in bath and in food were determined over a 20-month period involving one spawning cycle. High dosages produced a marked increase in mortality, probably by reducing the resistance to nonspecific stressors; survivors fish in high-dosage lots were significantly larger than those in control and low-DDT lots. Intermediate and low dosages of DDT generally did not measurably affect mortality, growth, or reproductive potential, indicating that a threshold level exists around 0.1 p.p.m. monthly in contact form and around 0.3 mg. DDT per kg. of fish weekly in the diet for the toxic effects of DDT.
Download or read book Effects of Pesticides on Fish and Wildlife written by and published by . This book was released on 1965 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residue Reviews R ckstandsberichte written by Francis A. Gunther and published by Springer. This book was released on 1971-04-06 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: That residues of pesticide and other "foreign" chemicals in food stuffs are of concern to everyone everywhere is amply attested by the reception accorded previous volumes of "Residue Reviews" and by the gratifying enthusiasm, sincerity, and efforts shown by all the in dividuals from whom manuscripts have been solicited. Despite much propaganda to the contrary, there can never be any serious question that pest-control chemicals and food-additive chemicals are essential to adequate food production, manufacture, marketing, and storage, yet without continuing surveillance and intelligent control some of those that persist in our foodstuffs could at times conceivably endanger the public health. Ensuring safety-in-use of these many chemicals is a dynamic challenge, for established ones are continually being dis placed by newly developed ones more acceptable to food technologists, pharmacologists, taxicologists, and changing pest-control requirements in progressive food-producing economies. These matters are of genuine concern to increasing numbers of governmental agencies and legislative bodies around the world, for some of these chemicals have resulted in a few mishaps from improper use. Adequate safety-in-use evaluations of any of these chemicals per sisting into our foodstuffs are not simple matters, and they incorporate the considered judgments of many individuals highly trained in a variety of complex biological, chemical, food technological, medical, pharmacological, and toxicological disciplines.
Download or read book Effects of DDT Spray on Fish and Aquatic Insects in Gallatin River Drainage in Montana written by W. R. Bridges and published by . This book was released on 1961 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: DDT was sprayed at 0.5 pound per acre for elm spanworm control in two drainages in north Georgia in both 1959 and 1960. In one drainage, precautions were taken to avoid the stream, and no significant mortality to aquatic organisms resulted. In the other drainage, DDT reached the stream in a normal spray operation, and serious depletion of aquatic invertebrates resulted. Recovery of bottom organisms was rapid, and total numbers of invertebrates were up to pre-treatment levels after four months.
Download or read book DDT written by United States. Environmental Protection Agency and published by . This book was released on 1975 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Pesticides on Fish and Wildlife written by United States. Bureau of Sport Fisheries and Wildlife and published by . This book was released on 1962 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Ddt and Other Insecticides on Fish and Wildlife written by Joseph P. Linduska and published by Forgotten Books. This book was released on 2018-02-28 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Effects of Ddt and Other Insecticides on Fish and Wildlife: Summary of Investigations During 1947 During 1947 studies were con ducted in several western forest areas during which ddt in quan tities of 1 to 10 pounds to an acre and the gamma isomer of benzene hexachloride in quantities of 1 and 2 pounds to an acre were ap plied by airplane. The Size of treated areas varied from small experimental plots of 25 acres to one that included more than 400, 000 acres. An experimental aerial treatment of a forest area near Beltsville, Md., was made, using a dosage of 5 pounds of ddt to an acre; and a 1-mile section of a West Virginia bass stream was treated experimentally with a dosage of 1 pound of ddt to an acre. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Effects of 1 4 Pound DDT Per Acre on Bird and Mammal Populations in Southeast Alaska written by H. R. Merriam and published by . This book was released on 1964 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Pesticides on Sports and Commercial Fisheries written by United States. Congress. Senate. Committee on Commerce. Subcommittee on Energy, Natural Resources, and the Environment and published by . This book was released on 1969 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Committee Serial No. 91-15. Considers the effects of DDT and similar agricultural pesticides on fish in Lake Michigan. Sept. 29 hearing was held in Lansing, Mich., and Sept. 30 hearing was held in Muskegon, Mich.
Download or read book Silent Spring written by Rachel Carson and published by Houghton Mifflin Harcourt. This book was released on 2002 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The essential, cornerstone book of modern environmentalism is now offered in a handsome 40th anniversary edition which features a new Introduction by activist Terry Tempest Williams and a new Afterword by Carson biographer Linda Lear.
