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Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
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Book Description
Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
Get Book Here
Book Description
Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
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Book Description
During 1987-90 high-altitude photography, aerial videography, counts, and models to estimate sizes of breeding populations of dabbling ducks and duck production and to identify duck habitat on U.S. fish and Wildlife Service land and easements and on private land in the prairie pothole region of the United States.
Author: Lewis M. Cowardin
Publisher:
ISBN:
Category : Bird populations
Languages : en
Pages : 32
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Book Description
During 1987-90, we used high-altitude photography, aerial videography, counts, and models to estimate sizes of breeding populations of dabbling ducks (Anatinae) and duck production and to identify duck habitat on U.S. Fish and Wildlife Service land and easements and on private land pothole region of the United States. in the prairie km2). Wetland area (ha per km2) The study area contained about 3.1 million wetland basins (28,490 was highest on service-owned land; wetland-basin density was greatest on service easements. Temporary and seasonal wetlands were underrepresented and lakes were overrepresented on service-owned land. Seventy-eight percent of all basins were less than 0.41 ha. Cropland dominated private land. Pond density decreased from 4.4/km2 in 1987 to 3.4/km2 in 1990 and pond area, from 7.2 ha/km2 to 2.7 ha/km2. The density of the blue-winged teal was greatest (3.4 pairs/km) and was followed in magnitude by those of the mallard (2.1 pairs/km2), the gadwall (1.8 pairs/km2), the northern pintail (0.8 pairs/km), and the redhead (0.8 pairs/km2). Duck density was consistently highest on service-owned land. The decline of breeding-population sizes in 1987-90 closely corresponded to losses of pond numbers and pond area. The density of breeding pairs per pond was inversely related to pond density, suggesting that breeding ducks tended to concentrate on the remaining ponds as drought intensified. The production of recruits followed the same pattern as breeding-population sizes. We estimated that 2.5% of the ducklings hatched on service-owned land, which was 1.3% of the study area; 19.6% hatched on service easements, which were 14.2% of the study area; and 77.9% hatched on private land, which was 84.6% of the study area.
Author:
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ISBN:
Category : Duck shooting
Languages : en
Pages : 44
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Author: L. Pete Heard
Publisher:
ISBN:
Category : Agricultural conservation
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 606
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Author: Jon G. Stanley
Publisher:
ISBN:
Category : Atlantic salmon
Languages : en
Pages : 28
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Book Description
Model was developed by evaluating individual suitability indices of 17 environmental variables that have been shown to affect productivity or survival of nonmigratory freshwater life history stages of Atlantic salmon (Salmo salar L.).
Author: Mark C. McKinstry
Publisher: University of Texas Press
ISBN: 0292778406
Category : Nature
Languages : en
Pages : 327
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Book Description
Wetlands and riparian areas between the Rocky Mountains and the Sierra Nevada are incredibly diverse and valuable habitats. More than 80 percent of the wildlife species in this intermountain region depend on these wetlands—which account for less than 2 percent of the land area—for their survival. At the same time, the wetlands also serve the water needs of ranchers and farmers, recreationists, vacation communities, and cities. It is no exaggeration to call water the "liquid gold" of the West, and the burgeoning human demands on this scarce resource make it imperative to understand and properly manage the wetlands and riverine areas of the Intermountain West. This book offers land managers, biologists, and research scientists a state-of-the-art survey of the ecology and management practices of wetland and riparian areas in the Intermountain West. Twelve articles examine such diverse issues as laws and regulations affecting these habitats, the unique physiographic features of the region, the importance of wetlands and riparian areas to fish, wildlife, and livestock, the ecological function of these areas, their value to humans, and the methods to evaluate these habitats. The authors also address the human impacts on the land from urban and suburban development, mining, grazing, energy extraction, recreation, water diversions, and timber harvesting and suggest ways to mitigate such impacts.
Author: James H. Selgeby
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
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Author: William F. Porter
Publisher: JHU Press
ISBN: 1421440202
Category : Science
Languages : en
Pages : 354
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Book Description
Wildlife management specialists and landscape ecologists offer a new perspective on the important intersection of these fields in the twenty-first century. It's been clear for decades that landscape-level patterns and processes, along with the tenets and tools of landscape ecology, are vitally important in understanding wildlife-habitat relationships and sustaining wildlife populations. Today, significant shifts in the spatial scale of extractive, agricultural, ranching, and urban land uses are upon us, making it more important than ever before to connect wildlife management and landscape ecology. Landscape ecologists must understand the constraints that wildlife managers face and be able to use that knowledge to translate their work into more practical applications. Wildlife managers, for their part, can benefit greatly from becoming comfortable with the vocabulary, conceptual processes, and perspectives of landscape ecologists. In Wildlife Management and Landscapes, the foremost landscape ecology experts and wildlife management specialists come together to discuss the emerging role of landscape concepts in habitat management. Their contributions • make the case that a landscape perspective is necessary to address management questions • translate concepts in landscape ecology to wildlife management • explain why studying some important habitat-wildlife relationships is still inherently difficult • explore the dynamic and heterogeneous structure of natural systems • reveal why factors such as soil, hydrology, fire, grazing, and timber harvest lead to uncertainty in management decisions • explain matching scale between population processes and management • discuss limitations to management across jurisdictional boundaries and balancing objectives of private landowners and management agencies • offer practical ideas for improving communication between professionals • outline the impediments that limit a full union of landscape ecology and wildlife management Using concrete examples of modern conservation challenges that range from oil and gas development to agriculture and urbanization, the volume posits that shifts in conservation funding from a hunter constituent base to other sources will bring a dramatic change in the way we manage wildlife. Explicating the foundational similarity of wildlife management and landscape ecology, Wildlife and Landscapes builds crucial bridges between theoretical and practical applications. Contributors: Jocelyn L. Aycrigg, Guillaume Bastille-Rousseau, Jon P. Beckmann, Joseph R. Bennett, William M. Block, Todd R. Bogenschutz, Teresa C. Cohn, John W. Connelly, Courtney J. Conway, Bridgett E. Costanzo, David D. Diamond, Karl A. Didier, Lee F. Elliott, Michael E. Estey, Lenore Fahrig, Cameron J. Fiss, Jacqueline L. Frair, Elsa M. Haubold, Fidel Hernández, Jodi A. Hilty, Joseph D. Holbrook, Cynthia A. Jacobson, Kevin M. Johnson, Jeffrey K. Keller, Jeffery L. Larkin, Kimberly A. Lisgo, Casey A. Lott, Amanda E. Martin, James A. Martin, Darin J. McNeil, Michael L. Morrison, Betsy E. Neely, Neal D. Niemuth, Chad J. Parent, Humberto L. Perotto-Baldivieso, Ronald D. Pritchert, Fiona K. A. Schmiegelow, Amanda L. Sesser, Gregory J. Soulliere, Leona K. Svancara, Stephen C. Torbit, Joseph A. Veech, Kerri T. Vierling, Greg Wathen, David M. Williams, Mark J. Witecha, John M. Yeiser
