Author: Richard LeMaster
Publisher: Stackpole Books
ISBN: 9780811729826
Category : Nature
Languages : en
Pages : 80

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Book Description
Instructions for identifying 40 species of ducks, geese and swans.

Author: Guy Baldassarre
Publisher: JHU Press
ISBN: 1421408082
Category : Science
Languages : en
Pages : 1183

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Book Description
The best-selling and authoritative reference book on waterfowl has been fully revised and updated by one of the world’s most respected waterfowl biologists. Honorable Mention for the PROSE Award for Excellence, Multivolume/Science of the Association of American Publishers Ducks, Geese, and Swans of North America has been hailed as a classic since the first edition was published in 1942. A must-have for professional biologists, birders, waterfowl hunters, decoy collectors, and wildlife managers, this fully revised and updated edition provides definitive information on the continent's forty-six species. Maps of both winter and breeding ranges are presented with stunning images by top waterfowl photographers and the acclaimed original artwork of Robert W. (Bob) Hines. Originally authored by F. H. Kortright and later revised by Frank Bellrose, this latest edition, which has been meticulously updated by renowned waterfowl biologist Guy Baldassarre, continues the legacy of esteemed authors. Each species account contains in-depth sections on: • identification • distribution • migration behavior • habitat • population status • breeding biology • rearing of young • recruitment and survival • food habits and feeding ecology • molts and plumages • conservation and management To facilitate identification, the species accounts also include detailed illustrations of wings. An appendix contains comparative illustrations of ducklings, goslings, and cygnets. This edition of Ducks, Geese, and Swans consists of two volumes, printed in full color, and packaged in a slipcase, along with a CD containing references and additional maps.

Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 138

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Book Description

Author: United States. Office of Water Resources Research
Publisher:
ISBN:
Category : Water conservation
Languages : en
Pages : 692

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Book Description

Author: Gary A. Wobeser
Publisher: Springer Science & Business Media
ISBN: 1461559510
Category : Science
Languages : en
Pages : 318

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Book Description
Management of wild waterfowl has become increasingly intensive. Many birds now hatch in managed nesting cover or in artificial nesting structures, use man-made wetlands, and winter on crowded refuges while consuming a grain diet The water they use is often limited in supply and may contain residues from its many prior users. Unfortunately, intensified management often results in new problems, among which disease is important There are many similarities between the current form of management used for some waterfowl and that used in domestic animals. In both, the objective is to maintain a healthy, productive population. Dealing with health problems in waterfowl will benefit from combining the skills of veterinary medicine and wildlife ecology. Revisiting this book after 15 years allowed me to consider changes at the interface between the two disciplines. Veterinary medicine traditionally has been concerned with the individual and with treating sick animals, while the ecologist is concerned with populations and the manager has limited interest in treating sick birds. During this period there has been a marked increase in awareness among veterinarians that they have a responsibility in wildlife and conservation biology. Curricula of many veterinary colleges now include material on non-domestic animals and attempt to put disease in an ecological context. Also during this time, waterfowl managers have become more aware of disease as a factor in population biology and there are early attempts to put numbers to "disease" in models of continental waterfowl populations.

Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 756

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Book Description

Author: United States. Office of Water Resources Research
Publisher:
ISBN:
Category : Water conservation
Languages : en
Pages : 356

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Book Description

Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 808

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Book Description

Author: Ducks Unlimited Staff
Publisher: Willow Creek Press
ISBN: 9781572233867
Category :
Languages : en
Pages : 0

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Book Description
Record your days afield and preserve them in style in this handsome new journal available exclusively from Ducks Unlimited. This one-of-a-kind logbook is bound in fine Cabra leather, with a special medallion tip-in on the cover that features a waterfowler at the end of a successful hunt. Your hunts, too, will be more successful when you return to your journal year after year to compare notes on weather conditions, flight times, number of birds seen, decoyed, and shot, and other important information that will help you hone your hunting strategies. Each right-hand page is a data sheet with extra space to record your thoughts, while each facing page features an inspirational hunting scene and a quotation on the joys of hunting or just spending time outdoors. A handsome silk ribbon helps you keep track of where you left off. Available in green or burgundy, The Waterfowler's Journal makes an ideal gift and is the perfect heirloom for passing the legacy of waterfowling from one generation to the next.

Author: C. Ray
Publisher: Springer Science & Business Media
ISBN: 0306481545
Category : Technology & Engineering
Languages : en
Pages : 377

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Book Description
Chittaranjan Ray, Ph. D. , P. E. University of Hawaii at Mãnoa Honolulu, Hawaii, United States Jürgen Schubert, M. Sc. Stadtwerke Düsseldorf AG Düsseldorf, Germany Ronald B. Linsky National Water Research Institute Fountain Valley, California, United States Gina Melin National Water Research Institute Fountain Valley, California, United States 1. What is Riverbank Filtration? The purpose ofthis book is to show that riverbank filtration (RBF) isa low-cost and efficient alternative water treatment for drinking-water applications. There are two immediate benefits to the increased use of RBF: Minimized need for adding chemicals like disinfectants and coagulants to surface water to control pathogens. Decreased costs to the community without increased risk to human health. Butwhat,exactly, isRBF? In humid regions, river water naturally percolates through the ground into aquifers (which are layers of sand and gravel that contain water underground) during high-flow conditions. In arid regions, most rivers lose flow, and the percolating water passes through soil and aquifer material until it reaches the water table. During these percolation processes, potential contaminants present in river water are filtered and attenuated. If there are no other contaminants present in the aquifer or ifthe respective contaminants are present at lower concentrations, the quality of water in the aquifer can be ofhigher quality than that found in theriver. In RBF, production wells — which are placed near the banks ofrivers —pump large quantities ofwater.