Download or read book The Effects of Habitat Selection on the Reproductive Success of Savannah Sparrows Passerculus Sandwichensis written by Peter J. Hodum and published by . This book was released on 1988 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Habitat Loss on the Savannah Sparrows Passerculus Sandwichensis of La Perouse Bay Manitoba written by Rachel Jane Sturge and published by . This book was released on 2007 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy grazing by lesser snow geese (Chen caerulescens caerulescens) in the coastal salt marshes of La Perouse Bay (Manitoba) has caused a shift from shrub-grassland habitat to barren patches (exposed mineral sediments and associated plant species), which has been linked to a decline in savannah sparrow (Passerculus sandwichensis) nesting densities. To determine the effects of this shift at a local scale, I monitored male territories for mating and fledging success, and compared these values to historic data. I measured various aspects of each territory and ran statistical tests to determine if any were correlated with reproductive success (measured by mating/fledging success). Positive correlations were found with the presence of graminoids, and medium-sized shrubs with graminoid ground cover, within a territory. Territories with larger patches of shrubs also had positive correlations with reproductive success. The territory's perimeter/area ratio and the presence of barren habitat had negative correlations with reproductive success.
Download or read book Reproductive Success of Belding s Savannah Sparrows in a Highly Fragmented Landscape written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the effects of fragmentation on resident populations of sparrows, the influence of habitat on reproductive success, identifies characteristics of breeding habitat, and discusses implications of results for wetland conservation.
Download or read book Habitat Selection and Reproductive Success of the Grasshopper Sparrow at the Santa Rosa Plateau Ecological Reserve written by Christine Lynn Collier and published by . This book was released on 1994 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology and Evolution of Male Parental Care in Savannah Sparrows written by Corey R. Freeman-Gallant and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 1997 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproductive Success of Savannah Sparrows Passerculus Sandwichensis and Other Grassland Birds Nesting in Rotationally and Continuously grazed Cattle Pastures in Southeast Minnesota written by Melissa Anne Driscoll and published by . This book was released on 2004 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Behavioral and Reproductive Consequences of Predator Activity to Grassland Birds written by Jennifer Lee Thieme and published by . This book was released on 2011 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Grassland birds are declining at greater rates than any other habitat guild in North America, yet conservation remains difficult due to extensive habitat loss and fragmentation throughout the urbanizing Midwest. Human presence is often associated with non-native predators (e.g., cats) and anthropogenic food sources, which collectively can promote high densities of nest predators in urban landscapes. High densities of nest predators are a concern because predation is the leading source of nest failure. Behavioral responses to predators may further diminish the value of urban habitats if birds avoid areas with high levels of predator activity, which could result in lower occupancy rates or densities of birds in urban habitat patches. In my research, I examined how habitat heterogeneity and variation in the predator community influenced the breeding ecology of grassland and early successional birds in urban parks. I asked two broad questions: (1) how do birds respond behaviorally to abundance and activity of predators in urban natural areas? (2) to what extent is avian reproductive success linked to predator communities and/or activity at plot and site scales? I collected data on avian density, nest placement, and reproductive success of eight focal species of grassland birds within 46 2-ha plots at seven urban parks near Chicago, Illinois, during 2009 and 2010. Relative abundance and activity levels of potential nest predator species, including mesopredators, small mammals, snakes, and avian predators, were estimated for each plot during surveys and as part of a collaborative study. As capture rates of small mammals increased, territory densities of Field Sparrow (Spizella pusilla), Common Yellowthroat (Geothlypis trichas), and Savannah Sparrow (Passerculus sandwichensis) declined, but density of Song Sparrow (Melospiza melodia) rose. Mesopredator capture rates were negatively associated with Common Yellowthroat and Savannah Sparrow densities within 2-ha plots, as well as Eastern Meadowlark (Sturnella magna) at the site level. Whereas small mammal and mesopredator capture rates explained some of the observed variation in territory density, daily nest survival of both Field and Song Sparrows was best explained by numbers of snakes observed within plots. Interestingly, snake activity was positively associated with nest survival of Field Sparrows, though negatively associated with that of Song Sparrows. At large scales, vegetation characteristics best predicted nest survival of both species, with nest survival of Field Sparrow improving as density of groundcover increased and nest survival of Song Sparrow improving as structural complexity increased. While the structural complexity of vegetation at nest sites was not explained by predator activity, Song Sparrows selected nest sites with lower groundcover density than available as activity of Brown-headed Cowbird (Molothrus ater) increased. As a whole, these results provide evidence that breeding grassland and early successional birds respond to both habitat structure and activity of potential predators at different scales. I also found that behavioral (e.g., territory selection) and demographic (e.g., nest survival) associations with predators do not necessarily match. For example, snakes had the strongest, though sometimes counterintuitive, relationship with nest success of Field and Song Sparrows, yet appeared to elicit no response during territory or nest site selection. My results are also consistent with other studies demonstrating the importance of vegetation structure to both settlement and reproductive success. Consequently, the best management practices in urban parks will both maintain vegetation structure that promotes successful nesting and discourage activities that promote high abundances of predators.
Download or read book Proximal Cues for Belding s Savannah Sparrow Habitat Selection Mugu Lagoon California written by Joy Ellen Yoon and published by . This book was released on 2003 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Selection and Utilization by the Savannah Sparrow written by Wayne C. Zipperer and published by . This book was released on 1979 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Agricultural Conservation Practices on Fish and Wildlife written by and published by . This book was released on 2008 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The bibliography is a guide to recent scientific literature covering effects of agricultural conservation practices on fish and wildlife. The citations listed here provide information on how conservation programs and practices designed to improve fish and wildlife habitat, as well as those intended for other purposes (e.g., water quality improvement), affect various aquatic and terrestrial fauna"--Abstract.
Download or read book Habitat Selection and Reproductive Success of Grassland Birds in Western Maryland written by Marie V. Brady and published by . This book was released on 2010 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology Conservation and Management of Grouse written by Brett K. Sandercock and published by Univ of California Press. This book was released on 2011-09-04 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Summarizing current knowledge of grouse biology, this volume is organized in four sections--spatial ecology, habitat relationships, population biology, and conservation and management--and offers insights into spatial requirements, movements, and demography of grouse. Much of the research employs emerging tools in ecology that span biogeochemistry, molecular genetics, endocrinology, radio-telemetry, and remote sensing".--Adapted from publisher descrip tion on back cover
Download or read book Rangeland Wildlife Ecology and Conservation written by Lance B. McNew and published by Springer Nature. This book was released on 2023-09-01 with total page 1017 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book reviews the importance of ecological functioning within rangelands considering the complex inter-relationships of production agriculture, ecosystem services, biodiversity, and wildlife habitat. More than half of all lands worldwide, and up to 70% of the western USA, are classified as rangelands—uncultivated lands that often support grazing by domestic livestock. The rangelands of North America provide a vast array of goods and services, including significant economic benefit to local communities, while providing critical habitat for hundreds of species of fish and wildlife. This book provides compendium of recent data and synthesis from more than 100 experts in wildlife and rangeland ecology in Western North America. It provides a current and in-depth synthesis of knowledge related to wildlife ecology in rangeland ecosystems, and the tools used to manage them, to serve current and future wildlife biologists and rangeland managers in the working landscapes of the West. The book also identifies information gaps and serves as a jumping-off point for future research of wildlife in rangeland ecosystems. While the content focuses on wildlife ecology and management in rangelands of Western North America, the material has important implications for rangeland ecosystems worldwide.
Download or read book Reproductive Response of Savannah Sparrows Passerculus Sandwichensis to Livestock Grazing at Humboldt Bay National Wildlife Refuge written by Dean C. Kwasny and published by . This book was released on 2000 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproductive Success Natal Dispersal and Recuritment in a Song Sparrow Melospiza Melodia Population Breeding in California Coastal Scrub written by Mary Katherine Chase and published by . This book was released on 2001 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prairie Birds written by Paul A. Johnsgard and published by . This book was released on 2001 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Johnsgard provides an overview of the history, current status, and uncertain future of prairie birds, from falcons and shorebirds to larks and sparrows. Some are intercontinental migrants that winter in South America, others sedentary species or short-distance travelers that may frequent the grasslands of Mexico. Johnsgard describes each species - its features, habits, habitats, migratory patterns, and breeding season ecology.".
Download or read book A Survey of the Belding s Savannah Sparrow Passerculus Sandwichensis Beldingi in California 2001 written by Richard Zembal and published by . This book was released on 2002 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
