Download or read book Limnological Organic Analyses by Quantitative Dichromate Oxidation written by John A. Maciolek and published by . This book was released on 1962 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A limnological oxidation technique, based on procedures employed in soil chemistry, was developed and tested by use of purified organic compounds and various natural substrates. A sample is oxidized by dichromate in a strongly acid medium maintained at 100 C. The amount of dichromate reacting (determined titrimetrically as the difference between the initial and final quantities) is reckoned as Oxygen Consumed, or weigh of oxygen required by the sample. The oxidation serves as the principal step for sensitive determinations of organic carbon (as CO2) and nitrogen (as NH3).

Download or read book Limnological Analyses written by Robert G. Wetzel and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thoroughly updated third edition, the authors provide a series of carefully designed and tested field and laboratory exercises that represent the full scope of limnology. In using the text, students will gain a solid foundation in this complex, multidisciplinary field of ecology as they explore the physical, chemical, and biological characteristics of standing and running waters. The book illustrates accepted standard methods as well as modern metabolic and experimental approaches and their research applications. Each exercise is preceded by an introductory section and concludes with questions for students as well as suggestions for further reading. As a textbook, this is a highly structured, concise presentation with a research-oriented approach that openly invites active participation by students.

Download or read book Research Report written by and published by . This book was released on 1961 with total page 1358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Limnological Analysis written by Robert G. Wetzel and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Limnological Analyses, a classic, second, thoroughly updated edition, consists of a series of carefully designed and tested field and laboratory exercises covering the full scope of limnology. It provides the student with a solid foundation in this complex multidisciplinary field of ecology and illustrates modern experimental approaches. Among the topics covered by such exercises are: major physical components of lakes and streams; important mineral nutrients; cycling of organic matter; benthic fauna; primary productivity of phytoplankton; quantitative methods in biota analysis; diurnal changes; experimental manipulation of model ecosystems; effects of sewage outfall and other human activities; whole ecosystem and community analyses. Each exercise is preceded by an introductory section and concludes with questions for the student and a selection of suggested reading. Teachers and students of limnology will value Limnological Analyses for its highly structured, concise presentation. Its research-oriented approach encourages active participation.

Download or read book Circular written by and published by . This book was released on 1967 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predicting Year class Abundance of Yellowstone Lake Cutthroat Trout written by Ross V. Bulkley and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluctuations in strength of year classes from 1945 to 1956 of Yellowstone Lake cutthroat from Pelican and Chipmunk Creeks are compared with the parental stock and several climatically influenced factors of the environment. Variations in year-class strength in the two tributaries were highly correlated with fluctuations in lake water levels. Strong year classes occurred in yeas of low water. Female spawner escapement, timing of the runs, and summer air temperatures were not significant factors. A formula based on water levels is presented for predicting year-class strength in Pelican Creek and in the Fishing Bridge area fishery. Stocking of fry in years of high water is suggested as a means of supplementing natural production. A method of forecasting lake water levels several months in advance of their occurrence is discussed.

Download or read book Research Report Bureau of Sport Fisheries and Wildlife written by United States. Bureau of Sport Fisheries and Wildlife and published by . This book was released on 1941 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Accumulated Excretory Products on Hatchery reared Salmonids written by Roger E. Burrows and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In experiments at the Bureau's Salmon-Cultural Laboratory, to determine the excretory products of significance in rearing ponds and the possible effect of these products on fingerling chinook salmon (Oncorhynchus tshawytscha), the results demonstrated that ammonia and urea are the principal products. The relative amounts of these products vary with the concentration of fish and with their metabolic activity. Ammonia assumes dominance in an unfavorable environment. Water temperature, pH, and pond type affect the toxicity of ammonia solutions. Continuous exposure to levels of ammonia normally encountered in rearing ponds produced extensive hyperplasia of the gill epithelium in controlled experiments.

Download or read book Description of Eggs and Larvae of the Summer Flounder Paralichthys Dentatus written by W. G. Smith and published by . This book was released on 1970 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summer flounder eggs and larvae are described from artificially fertilized specimens and from material collected at sea, accompanied by a set of illustrative plates.

Download or read book Research Report written by U.S. Fish and Wildlife Service and published by . This book was released on 1980 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sea water Systems for Experimental Aquariums written by John R. Clark and published by . This book was released on 1964 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume was created to provide a source of information on design, construction, and operation of experimental aquarium facilities. The idea developed out of the editors largely unsuccessful search for published material on sea-water supply systems while planning the facilities for the Sandy Hook Marine Laboratory. The result is compiled volume of papers contributed by a number of aquarists who descibed their experiences in solving problems encountered in designing, constructing and maintaining systerms.

Download or read book Food Habits of Striped Marlin and Sailfish Off Mexico and Southern California written by Douglas H. Evans and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stomach contents of 924 striped marlin landed in the sport catches at Mazatlan, Sinaloa, and Buena Vista, Baja California, Sur, Mexico, and San Diego, California, and of 197 sailfish from Mazatlan and Buena Vista were examined. The striped marlin and sailfish fed primarily on pelagic fishes and cephalopods. By volume the major foods were squid (principally Dosidicus gigas) for striped marlin at Mazatlan and for striped marlin and sailfish at Buena Vista, northern anchovy for striped marlin at San Diego, and threadfin for sailfish at Mazatlan. Locally differences in food habits were pronounced, and some seasonal and yearly differences were found.

Download or read book Effects of Post impoundment Shore Modifications on Fish Populations in Missouri River Reservoirs written by Norman Gustaf Benson and published by . This book was released on 1980 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Missouri River main stem reservoirs in Montana, North Dakota, and South Dakota, hydrodynamic processes have decreased the lengths of shorelines and changed their configurations during the first 20 to 25 years of impoundment. Physical changes to the shore probably influenced fish abundance and species composition by changing the quality and quantityt of spawning and nursery habitat.

Download or read book Carp River Carpsucker Smallmouth Buffalo and Bigmouth Buffalo in Lewis and Clark Lake Missouri River written by Charles H. Walburg and published by . This book was released on 1966 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of age composition, growth, length-weight relation, reproduction, year-class strength, and food habits were conducted from 1962 to 1964 on carp, river carpsucker, smallmouth buffalo, and bigmouth buffalo in Lewis and Clark Lake, a main stem Missouri River reservoir impounded in July 1955. Slow growth of these fishes was attributed to low standing crops of plankton and bottom fauna which may have resulted in excessive turbidity and rapid water exchange in the reservoir. All four species produced strong year classes in the 2 years following impoundment of Lewis and Clark Lake; reproduction since that time has been poor. These species did not produce year classes comparable in abundance to thos which occurred following impoundment because of unfavorable environmental conditions. The probable major limiting successful reproduction was lack of rise in water level durig the spawning period.

Download or read book Chronic Effects of Endrin on Bluntnose Minnows and Guppies written by Donald Irvin Mount and published by . This book was released on 1962 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an investigation of chronic toxicity of endrin to bluntnose minnows and guppies, conducted for 291 days, neither species could withstand concentrations greater than 0.5 parts per billion of endrin in water for more than a few days. Less than 50 percent of the test animals could live in 0.5 p.p.b. for more than 30 days. Approximately 65 percent could live in 0.4 p.p.b. for periods exceeding 30 days, while there was little mortality due to endrin on 0.25 and 0.1 p.p.b. endrin in water.

Download or read book Review of Fishery Studies on Missouri River Main Stem Reservoirs written by Norman Gustaf Benson and published by . This book was released on 1968 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The six main stem Missouri River reservoirs are described, and information available through 1964 on plankton, water chemistry, fish populations, and water management is discussed. At maximum pool, these reservoirs have a capacity of 76 million acre-feet and a surface area of 1.2 million acres. Each of the upper reservoirs is larger in capacity and area than the sum of the lower three reservoirs. Fishes common in this system are bigmouth buffalo, carp, river carpsucker, yellow perch, goldeye, northern pike, sauger, walleye, white crappie, black crappie, and freshwater drum. Available information on growth rates, year-class strength, and relative abundance of common species is described. Limiting factors of the environments are the turbidities, wind, and fine soils. Research needs and problems relative to fish production are discussed.

Download or read book Revised Bibliography on the Cutthroat Trout written by Oliver B. Cope and published by . This book was released on 1964 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is a compilation of 221 abstracts of publications on the biology, culture, distribution, and management of the cutthroat trout, Salmo clarki Richardson. The 1958 publication, "Annotated Bibliography on the Cutthroat Trout," contained 135 abstracts, which have been incorporated with recent ones to form the present report.