Download or read book Factors Affecting Duck Nesting in the Aspen Parklands written by David William Howerter and published by . This book was released on 2003 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Habitat fragmentation often has been cited as a cause for reduced reproductive success of grassland-nesting birds, including ducks, though results of many studies have been equivocal. As remotely sensed habitat data become increasingly available, an increased understanding of how habitat configurations affect demographic parameters will allow wildlife managers to make better decisions about habitat preservation and restoration. We used duck (Anas spp.) nesting data from 15 65-km2 study areas (n=6300 nests) dispersed throughout the aspen (Populus tremuloides) parklands of south-central Canada, to test hypotheses and build models that predict hatching rates and nest-site distributions in relation to landscape features. We constructed separate models using landscape features generated at 3 different spatial extents and using 3 different habitat classification schemes. Generalized linear mixed-modeling techniques were used to model hatching rates, and logistic regression was used to discr.
Download or read book Factors Affecting Nesting Success of the Canvasback in the Aspen Parklands written by Jerome H. Stoudt and published by . This book was released on 1965 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Cattle Grazing on Upland Nesting Duck Production in the Aspen Parkland written by Jeffrey Michael Warren and published by . This book was released on 2004 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The beef industry is growing rapidly throughout the Aspen Parkland of Canada, leading to higher stocking rates on pastures and use of previously idled areas. Conversely, increased demand for pastureland has led to conversion of cropland that may have benefited upland nesting ducks by increasing the amount of perennial cover. We undertook the current study to evaluate the relationships of nest-site selection and nesting success of upland-nesting ducks to cattle grazing in the Aspen Parkland. Nearly 4,000 ha of upland cover were searched during the study. Vegetation physiognomy was quantified at each nest and at random points within each field. Despite extensive drought, nest searches located 309 duck nests. Grazing demonstrated a strong negative effect on duck nest densities, as did declining pasture health. Our best model of nesting success indicated an interaction between nest-site vegetation and residual cover. Across most values of residual cover, nesting success was positively inf.
Download or read book Ecological Factors Affecting Waterfowl Production in the Alberta Parklands written by Allen G. Smith and published by . This book was released on 1972 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Landscape Characteristics on Duck Nesting Success in the Missouri Coteau Region of North Dakota written by Scott Eugene Stephens and published by . This book was released on 2003 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Factors Affecting Waterfowl Production in the Saskatchewan Parklands written by Jerome H. Stoudt and published by . This book was released on 1972 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Habits and Environmental Factors Affecting Ducks Nesting on the Medicine Lake Refuge Washington written by Marcus Nelson and published by . This book was released on 1938 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nesting Ecology of Ducks in Dense Nesting Cover and Restored Native Plantings in Northeastern North Dakota written by Ryan D. Haffele and published by . This book was released on 2012 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conservation efforts to increase duck production have led the United States Fish and Wildlife Service to restore grasslands with multi-species (3-5) mixtures of cool season vegetation often termed dense nesting cover (DNC). The effectiveness of DNC to increase duck production has been variable, and maintenance of the cover type is expensive. In an effort to decrease the costs of maintaining DNC and support a more diverse community of wildlife, restoration of multi-species (16-32) plantings of native plants has been explored. Understanding the mechanisms of nest site selection for nesting ducks within these plantings is important in estimating the efficiency of this cover at providing duck nesting habitat and determining appropriate management techniques. I investigated the vegetation characteristics between the 2 aforementioned cover types in the prairie pothole region of North Dakota, USA to see if native plantings provide the same vegetative structure to nesting hens as DNC. I also determined the nest density and nest success of upland nesting waterfowl in the cover types to determine if restored native plantings are providing the same nesting opportunity as DNC. Within each cover type I identified vegetation characteristics at nest sites of the 5 most common nesting species and compared them to random locations and within species to identify species specific factors in nest site selection. I located 3,524 nests (1,313 in restored-native vegetation and 2,211 in DNC) of 8 species in 2010-11. Native plantings had an average of 6.17 (SE = 1.61) nests/ha while DNC had an average of 6.71 (0.96) nests/ha. Nest densities were not different between cover types for the 5 most common nesting species. In 2010, nest success differed between cover types with restored-native plantings having 48.36% (SE = 2.4) and DNC having 42.43% (2.1) success. In 2011, restored-native planting success dropped considerably to 13.92% (1.7) while DNC success was similar to 2010 at 37.10% (1.7) The variability in nest success appeared to be impacted by late season success, as native plantings had similar success early in the nesting season, but much lower success later in the nesting season in both years. Vegetation data indicated no structural difference between cover types in 2010; however, a difference was detected during the late sampling period in 2011, with native plantings having shorter vegetation at random locations than DNC during this sampling period. In general ducks selected nest sites with greater leaf litter and denser, taller cover compared to random sites, however, vegetation density and height selection varied among species. Gadwall and mallards selected the tallest, densest vegetation, with northern pintail, blue-winged teal, and northern shovelers selecting vegetation of intermediate height and density. My results indicate native plantings are able to support similar densities of nests, but have great variability in nest success from year to year. In years with low nest success, native plantings may create an ecological sink as hens were not able to identify low quality patches and nested in similar densities despite lower success.
Download or read book Factors Influencing Waterfowl Counts on Aerial Surveys 1961 66 written by R. Kahler Martinson and published by . This book was released on 1967 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveying of selected transects from the air and from the ground has been used since 1959 to determine the proportion of waterfowl, by species, that are observed by aerial crews. This method attempts to resolve obvious biases in aerial indexes relating to habitat differences, seasonal differences, aerial crew changes, etc. Assumptions in this method of correction are that (1) the ground crew observed substantially all waterfowl present and (2) the selected comparison transects adequately represent surrounding transects to which the correction is to be applied. This report, utilizing data of 1961 to 1966, reviews the necessity for air:ground correction and evaluates the procedure as a solution to aerial index biases ; problems apparent are lack of representativeness of air:ground transects and inadequate numbers of transects. Lack of representativeness appears in population density and in species composition differences between air:ground and operational transects. The degree to which the numbers of air:ground ratios varies according to areas and according to species. Recommendations to improve the air:ground technique are: (1) make two daily surveys of one aerial pass each, at an interval of at least two hours, in the same direction and at the same time as the adjacent operational transects are surveyed ; (2) make ground counts the day before or day after aerial surveys ; (3) lay out all air:ground comparison transects in the same direction (west-east) as the operational transects ; and (4) match new or relocated transects as nearly as possible to density and species composition of the survey stratum or area they represent.
Download or read book Resource Publication written by and published by . This book was released on 1971 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Scientific Report wildlife written by and published by . This book was released on 1952 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Vegetation Structure in Seeded Nesting Cover in the Prairie Pothole Region written by Kenneth F. Higgins and published by . This book was released on 1982 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A sample of 365 stands of seeded nesting cover (mixtures of cool-season grasses and legumes) was studied in the glaciated prairie pothole region during 1977-79. Measurements of species composition, canopy cover, plant height, and visual obstruction values differed with stand age but only in a general way when results from over the entire region were pooled. Maximum values for plant height and visual obstruction occurred once per stand during the first 10 growing seasons. Although the year of maximum growth was variable and unpredictable, stands showed trends of degeneration in height and visual obstruction after the year of maximum growth.
Download or read book Ducks Geese and Swans of North America written by Guy A. Baldassarre and published by JHU Press. This book was released on 2014 with total page 1183 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 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. Guy Baldassarre has hit the target. His remake of the Kortright/Bellrose classic provides good biological descriptions, wonderful photographs and illustrations, and easy-to-understand information about waterfowl. I would encourage every hunter and enthusiast to have these books as an educational guide to waterfowl and their needs.--H. Dale Hall, CEO, Ducks Unlimited, Inc. When, as an eleven-year-old in 1942, I read F. H. Kortright's first edition of this book, it altered the trajectory of my life. Every subsequent edition, including this latest update by Guy Baldassarre, has improved the landmark reference. I can't imagine that anyone interested in waterfowl or wetlands can live without this indispensable book.--Paul A. Johnsgard, University of Nebraska-Lincoln Creating a brand-new version of such a timeless and previously revised classic is a risky venture indeed, but nobody could be better suited for this monumental task than Guy Baldassarre. He has created a stunning new classic, at once magnificent in its visual appeal and truly comprehensive in its scientific breadth and depth. Hats off to Guy for dedicating himself to this project with such obvious passion, patience, and skill. This book absolutely belongs on the shelf or coffee table of anyone who has ever marveled at waterfowl, whether through their binoculars or from inside the duck blind.--John W. Fitzpatrick, Cornell Laboratory of Ornithology Guy Baldassarre was a professor of wildlife ecology at the State University of New York College of Environmental Science and Forestry in Syracuse until his death in 2012. He is the coauthor of the textbook, Waterfowl Ecology and Management. Johns Hopkins University Press Baltimore www.press.jhu.edu This product consists of two volumes, packaged in a slipcase along with a CD containing references and additional maps. ISBN 13: 978-1-4214-0751-7 ISBN 10: 1-4214-0751-5 [Use barcode for ISBN 13: 978-1-4214-0751-7] Cover design: Cover illustration: Northern Pintail. GaryKramer.net Author photo: HOLD SPACE FOR AUTHOR PHOTO X: \marketing\author photos --John W. Fitzpatrick, Cornell Lab of Ornithology "Midwest Book Review"
Download or read book Effects of Vegetation Manipulation on Breeding Waterfowl in Prairie Wetlands written by Harold A. Kantrud and published by . This book was released on 1986 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Ecology of Migratory Birds written by and published by . This book was released on 1972 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Research written by United States. Bureau of Sport Fisheries and Wildlife and published by . This book was released on 1963 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Research Problems Programs Progress written by and published by . This book was released on 1962 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
