Download or read book Habitat Use in Baird s and Grasshopper Sparrows written by Kelly Gamble and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Settlement Cues and Resource Use by Grasshopper Sparrows and Baird s Sparrows in the Upper Great Plains written by Marissa A. Ahlering and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To date, studies of the habitat selection process in grassland passerines have neglected the role of settlement cues, the proximate habitat cues birds use to establish breeding territories. I evaluated the settlement cues and resource use for two species of grassland birds, Grasshopper Sparrows (Ammodramus savannarum) and Baird's Sparrows (Ammodramus bairdii), between 2002 and 2004 in North Dakota, USA and Saskatchewan, Canada. Regional settlement patterns for Grasshopper Sparrows and Baird's Sparrows may be partially driven by weather patterns. Spring densities of Grasshopper Sparrows were positively related to May precipitation, and spring densities of Baird's Sparrows were negatively related to the previous winter's snowfall. At the territory level, Grasshopper Sparrows responded negatively to the cover of woody vegetation in the habitat. Baird's Sparrow results suggest birds choose habitat based on characteristics conducive to their foraging behavior. Experimental playback results suggest the presence of conspecifics may be a cue for territory establishment by Baird's Sparrows. Social cues may play an important role in the habitat selection process for this species. I also assessed the potential use of vegetation as predictive cues for invertebrate food resources. Results indicate more cover of live forbs in early May predict higher densities of Lepidoptera larvae in June, and less open ground in early May indicates higher densities of Araneae in June. However, none of the vegetation parameters predicted the June densities of Orthoptera. Lepidoptera larvae and Orthoptera were the two dominant food items for both species. I examined the range of habitat use for both species. Baird's Sparrows showed the widest range of habitat use in Saskatchewan where densities were the highest. The presence of conspecifics may cause adults to be more flexible in their habitat use. Grasshopper Sparrows exhibited more variation in the range of habitat use across sites. For this species, the range of habitat use was constrained by the vegetation available at the site. By examining the range of use across multiple sites within both species' range and at different population densities, patterns of habitat use become more apparent.

Download or read book Overwinter Survival and Habitat Selection of Baird s and Grasshopper Sparrows in the Marfa Grasslands Texas written by Denis Josefina Perez-Ordonez and published by . This book was released on 2019 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Suitability Index Models written by Patrick J. Sousa and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Use by Grasshopper and Savannah Sparrows at Bradley International Airport and Management Recommendations written by Thomas Ivan Crossman and published by . This book was released on 1989 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Baird s Sparrow Status Assessment and Conservation Plan written by Stephanie L. Jones and published by . This book was released on 1998 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Suitability Index Models written by Patrick J. Sousa and published by . This book was released on 1983 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Analysis of the Habitat of Henslow s Sparrows and Grasshopper Sparrows Compared to Random Grassland Areas written by and published by . This book was released on 2005 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Henslow's Sparrows are endangered prairie birds, and Grasshopper Sparrows are considered rare prairie birds. Both of these birds were abundant in Illinois, but their populations have been declining due to loss of the grasslands. This begins an ongoing study of the birds habitat so Fermilab can develop a land management plan for the Henslow's and Grasshoppers. The Henslow's were found at ten sites and Grasshoppers at eight sites. Once the birds were located, the vegetation at their sites was studied. Measurements of the maximum plant height, average plant height, and duff height were taken and estimates of the percent of grass, forbs, duff, and bare ground were recorded for each square meter studied. The same measurements were taken at ten random grassland sites on Fermilab property. Several t-tests were performed on the data, and it was found that both Henslow's Sparrows and Grasshopper Sparrows preferred areas with a larger percentage of grass than random areas. Henslow's also preferred areas with less bare ground than random areas, while Grasshoppers preferred areas with more bare ground than random areas. In addition, Grasshopper Sparrows preferred a lower percentage of forbs than was found in random areas and a shorter average plant height than the random locations. Two-sample variance tests suggested significantly less variance for both Henslow's Sparrows and Grasshopper Sparrows for maximum plant height in comparison to the random sites. For both birds, the test suggested a significant difference in the variance of the percentage of bare ground compared to random sites, but only the Grasshopper Sparrow showed significance in the variation in the percentage of forbs.

Download or read book Final Environmental Statement on Grazing Management in the East Roswell ES Area written by United States. Bureau of Land Management and published by . This book was released on 1979 with total page 634 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 Factors Affecting Breeding Territory Size and Placement of the Florida Grasshopper Sparrow Ammodramus Savannarum Floridanus written by Jill Nicole Aldredge and published by . This book was released on 2009 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: For most taxa, maximizing fitness depends on maintaining access to adequate resources. Territories provide exclusive use of resources for an individual or a family group, thus facilitating successful reproduction. The economic defensibility of a territory depends on the quality, abundance, and distribution of its resources as well as the amount of competition that an individual must endure to maintain exclusive access. The benefits of defense must outweigh the costs for territoriality to be profitable. Territory owners may benefit from territories with high quality resources, but they also may incur greater costs defending these resources from competitors. In contrast, territories with poor quality resources provide fewer benefits to an owner but also may have fewer competitors vying for those resources. Resource quality may change over time, especially in habitats in which periodic ecological disturbances, such as fire, occur. As a result, the cost-benefit equation of defensibility also changes over time. The Florida Grasshopper Sparrow (Ammodramus savannarum floridanus), an Endangered subspecies, is a habitat specialist endemic to the Florida dry prairie, a pyrogenic ecosystem found only in south-central Florida. As a result A. s. floridanus has evolved with frequent fires and its demography is strongly influenced by the structural habitat characteristics, such as sparse woody vegetation and large amounts of bare ground that occur with frequent fire. The objective of my study was to determine what factors associated with fire (i.e. habitat structure and prey abundance) affected the "decisions" of male A. s. floridanus to defend a territory. I hypothesized that fire and the resources resulting from fire would have an impact on territory size and placement. I predicted that territories in more recently burned habitat would be of higher quality and that sparrows would avoid areas with a longer time since fire. I conducted my study at Kissimmee Prairie Preserve State Park in Okeechobee County, FL. One half of my 100-ha study plot had experienced two growing seasons since the last fire and the remaining half had experienced only a single growing season since fire at the start of my study. I mapped territories of all males within my study plot twice over the breeding season; once during the early season (nest building and incubation) and once during the late season (nestling and fledgling stages). In addition, during each survey I collected arthropods and surveyed vegetation composition within territories and at random, unoccupied points within the study plot. I compared the differences between the habitat characteristics of territories and unoccupied areas, the differences between the territories of the males that occupied the two-year rough and those in the one-year rough, males that abandoned their territories mid-season and those that remained in the study plot, and the seasonal changes in territory characteristics between the early and late season territories of males that persisted. My results indicate that A. s. floridanus selects certain habitat characteristics in which to place territories. Males preferred areas with fewer shrubs and more bare ground, which is consistent with previous studies. Prey biomass did not differ between territories and unoccupied areas. Nonetheless, although the mean mass of individual arthropods was larger in unoccupied areas, the numerical abundance of orthopterans, damselflies, and spiders was significantly higher in territories than in unoccupied areas. Sparrows were more likely to abandon their territories if they occurred in the two-year rough as opposed to the one-year rough. Territories in the two-year rough were significantly larger, had poorer quality habitat, and tended to have less prey than those in the one-year rough. The sparrows that persisted throughout the season significantly increased their territory size in the late season; however, very little spatial shift occurred, suggesting that they merely increased their territory size rather than moved to new sites. Early-season territories in the one-year rough were completely exclusive, but late season territories showed considerable overlap, suggesting lack of defense and a shift toward home ranges as opposed to exclusive territories. The habitat quality in late-season territories decreased (more shrubs, less bare ground) from the early season. Unexpectedly, however, the biomass of prey increased. This increase coincides with an increased demand for prey because sparrows are provisioning young. It seems likely that the costs of defense increase at this time because time and energy spent in defense come at the expense of time spent provisioning young. Because prey increases in the late season, the need to defend exclusive territories may decline.

Download or read book Special Reference Briefs written by and published by . This book was released on 1983 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Nesting Habitat of Florida Grasshopper Sparrows at Avon Park Air Force Range written by Michael F. Delany and published by . This book was released on 1998 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proposed Geothermal Leasing in the Lightning Dock Area Las Cruces Lordsburg Resource Area Technical Report Environmental Analysis Record written by and published by . This book was released on 1976 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book East Roswell Draft Grazing Environmental Statement written by United States. Bureau of Land Management and published by . This book was released on 1979 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: