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Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 196
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Book Description
Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 196
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Book Description
Author: Maqbool Hussain
Publisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 96
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Book Description
Author: T. D. Bills
Publisher:
ISBN:
Category : Aquatic invertebrates
Languages : en
Pages : 22
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Book Description
Author: Thomas M. Jolliff
Publisher:
ISBN:
Category : Environmental impact statements
Languages : en
Pages : 30
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Book Description
Author: R. E. Foreman
Publisher: Springer Science & Business Media
ISBN: 1461594537
Category : Medical
Languages : en
Pages : 460
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Book Description
What, precisely, is a primitive fish? Most biologists would agree that the living cyclostomes, selachians, crossopterygians, etc. cannot be considered truly primitive. However, they and the fossil record have served to provide the information which forms the basis for speculation concerning the nature of the original vertebrates. This symposium of biologists from a variety of disciplines was called together to create collectively, from the best available current evidence, a picture of the probable line of evolution of the prototype primitive fishes. The symposium was designed to follow one that took place in Stockholm in 1967, convened for a similar purpose, with about the same number of participants. It is a matter of interest that almost the entire 1967 symposium (Nobel Symposium 4) dealt only with the hard tissues, whether fossil or modern. In charting the course of the present symposium it was felt that the intervening years have produced numerous lines of new evidence that could be employed in the same way that a navigator determines his position. Each field, be it adult morphology, geology, ecology, biochemistry, development or physiology, generates evidence that can be extrapolated backward from existing vertebrate forms and forward from invertebrate forms. If the intersect of only two lines of evidence produces a navigational "fix" of rather low reliability, then an intersect, however unfocussed, of multiple guidelines from more numerous disciplines might provide a better position from which to judge early vertebrate history.
Author: R. A. Schnick
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 33
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Book Description
The search for a selective toxicant to control the sea lamprey, scourge of Great Lakes fisheries, culminated in the discovery of TFM (3-trifluormethyl-4-nitrophenol) in the late 1950's. The research, however, had only begun on its chemical and physical properties, efficacy, toxicity to non-target and target species, residues, and methods. Federal, State, university, and industrial agencies contributed much in the effort to determine the effect of TFM on the environment and other organisms; however, much still remains to be done if TFM is to gain continued clearance by the Environmental Protection Agency for use as a larval lampricide in the aquatic environment.
Author: Leif L. Marking
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 33
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Book Description
The search for a selective toxicant to control the sea lamprey, scourge of Great Lakes fisheries, culminated in the discovery of TFM (3-trifluormethyl-4-nitrophenol) in the late 1950's. The research, however, had only begun on its chemical and physical properties, efficacy, toxicity to non-target and target species, residues, and methods. Federal, State, university, and industrial agencies contributed much in the effort to determine the effect of TFM on the environment and other organisms; however, much still remains to be done if TFM is to gain continued clearance by the Environmental Protection Agency for use as a larval lampricide in the aquatic environment.
Author: Michael J. Lannoo
Publisher:
ISBN:
Category : Art
Languages : en
Pages : 548
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Book Description
In 1990 an international group of biologists, meeting to discuss rumors of declines in the number of amphibians, discovered that amphibian disappearances once thought to be a local problem were not--the problem was global. And, even more disturbing, amphibians were disappearing not just from areas settled by humans but from regions of the world once believed to be pristine. Under the mantle of the Declining Amphibian Populations Task Force, this timely book addresses three fundamental questions for the midwestern United States: are amphibians declining; if so, why; and, if so, what can be done to halt these losses? In the Midwest--defined here as Missouri, Iowa, Illinois, Indiana, Ohio, Minnesota, Wisconsin, and Michigan--there can be no doubt that the number of salamanders and frogs has declined with Euro-American settlement and the conversion to an agriculturally dominated landscape. Habitat loss and landscape fragmentation have been major factors in this decline, as have aquacultural uses of natural wetlands. Bullfrog introductions have eliminated populations of native amphibians, and collecting for the biological supply trade has reduced the number of individuals within many populations. The goal of the forty-two essays in this well-documented, well-illustrated book is to put between two covers all we know now about the status of midwestern amphibians. By doing this, the editor has created a readily accessible historical record for future studies. Organized into sections covering landscape patterns and biogeography, species status, regional and state status, diseases and toxins, conservation, and monitoring and applications, this landmark volume will serve as the foundation for amphibian conservation in the Midwest.
Author:
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 38
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Book Description
Author: Verdel K. Dawson
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 13
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Book Description
The lampricide activity 3-trifluoromethyl-4-nitrophenol (TFM) was tested under controlled laboratory conditions to evaluate factors which may influence the efficacy of the chemical. TFM was tested at temperatures of 7, 12, 17 and 22 degrees Centigrade, total water hardnesses of 12, 44, 170 and 300 mg/liter as CaCO3, and pH's of 6.5, 7.5, 8.5 and 9.0. TFM is an effective lampricide. It is more effective against larvae of the sea lamprey than against embryos and prolarval stages and slightly more effective against larvae of sea lampreys than against those of the American brook lamprey. Efficacy of the lampricide is affected very little by temperature, but is reduced in hard water, especially at high pH's. High pH decreases the activity of TFM and has the greatest influence on toxicity of any of the factors investigated. TFM is slightly more effective against exposed (Free-swimming) larvae than against those in burrows.
