Download or read book A Critical Review of the Aerial and Ground Surveys of Breeding Waterfowl in North America written by Graham W. Smith and published by . This book was released on 1995 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Critical Review Of The Aerial And Ground Surveys Of Breeding Water Fowl In North America Biological Science Report 5 U S Department Of The Interior written by Geological Survey (U.S.) and published by . This book was released on 1998* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Critical Review of the Aerial and Ground Surveys of Breeding Waterfowl in North America written by Graham W. Smith and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Fish and Wildlife Service and the Canadian Wildlife Service in cooperation with others have conducted an annual survey of breeding waterfowl throughout central Canada, the north-central United States, and Alaska since 1955. The area comprises more than 50 strata of habitats. Ducks are counted from aerial transects, and the counts are adjusted upward to account for birds that are not observed by aerial crews. These adjustments, called visibility correction factors, are developed from counts on the ground during which all waterfowl are assumed to have been detected. Counts on the ground are made of a subsample of the aerial survey. Visibility correction factors are calculated for each species and for each aerial crew. The total number of ducks by species and by strata is then calculated as the product of the observed density, the visibility correction factor, and the area of the strata.
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Download or read book Wildlife Report written by and published by . This book was released on 2003 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Monitoring Ecosystems written by David E. Busch and published by . This book was released on 2003 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Often a commitment to large ecosystem initiatives is linked both conceptually and legally with requirements for ecological monitoring as a means of evaluating the effectiveness of management actions. Programs to determine ecosystem status and trends can contribute significantly to the resolution of difficult and contentious management questions, and can playa key role both in sharpening the focus of research questions and in developing adaptive approaches to resource management. Monitoring Ecosystems brings together leading scientists and researchers to offer a groundbreaking synthesis of lessons learned about ecological monitoring in major ecoregional initiatives around the United States. Contributors-Donald L. DeAngelis, Lance H. Gunderson, Barry R. Noon, John C. Ogden, Craig J. Palmer, Keith M. Reynolds, Paul L. Ringold, John R. Sauer, Lawrence E. Stevens, and many others-present insights and experiences gained from their work in designing, developing, and implementing comprehensive ecosystem monitoring programs in the Pacific Northwest, the lower Colorado River Basin, and the Florida Everglades. The book: outlines the conceptual and scientific underpinnings for regional-scale ecosystem monitoring, examines the role and importance of data management, modeling, and integrative analyses, considers techniques for and experience with monitoring habitats, populations, and communities Chapters by the editors synthesize and expand on points made throughout the volume and present recommendations for establishing frameworks for monitoring across scales, from local to international. Monitoring Ecosystems presents a critical examination of the lessons learned from direct experience along with generalized conclusions that canbe applied to monitoring programs in the United States and around the world. It is a vital contribution to science-based monitoring efforts thatwill allow those responsible for developing and implementing ecoregional initiatives to make use of knowledge gained in previous efforts, enabling them to focus their energies on system-specific questions and problems.
Download or read book Wildlife Research written by and published by . This book was released on 2009 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Aerial Surveys of Waterbirds in Alaska 1957 94 written by John I. Hodges and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Acritical Review of the Aerial and Ground Surveys of Breeding Waterfowl in North America written by Graham W. Smith and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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