Download or read book Impacts of Climate Change and Intensive Lesser Snow Goose Chen Caerulescens Caerulescens Activity in High Arctic Pond Complexes Banks Island Northwest Territories written by Thomas Kiyoshi Fujiwara Campbell and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid increases in air temperature in Arctic and subarctic regions are driving significant changes to surface water. These changes and their impacts are not well understood in sensitive high Arctic ecosystems. This thesis explores changes in surface water in the high Arctic pond complexes of western Banks Island, Northwest Territories, and examines the impacts of this change on vegetation communities. Landsat imagery (1985-2015) was used to detect trends in surface water, moisture, and vegetation productivity, aerial imagery change detection (1958 and 2014) quantified shifts in the size and distribution of waterbodies, and field sampling investigated factors contributing to observed changes. The impact of expanding lesser snow goose populations on observed changes in surface water was investigated using the aerial imagery change detection of 2409 waterbodies and an information theoretic model selection approach, while their impact on vegetation was assessed using data from field surveys. Our analyses show that the pond complexes of western Banks Island are drying, having lost 7.9% of the surface water that existed in 1985. This loss of surface water disproportionately occurred in smaller sized waterbodies, indicating that climate is the main driver. Model selection showed that intensive occupation of lesser snow geese was associated with more extensive drying and draining of waterbodies and suggests this intensive habitat use may reduce the resilience of pond complexes to climate warming. Evidence from field surveys suggests that snow goose foraging is also contributing to patches of declining vegetation productivity within drying wetland areas. Diminishing and degrading high Arctic pond complexes are likely to alter permafrost thaw and greenhouse gas emissions, as well as the habitat quality of these ecosystems. Additional studies focused the mechanisms of surface water loss, the direct impacts of wetland drying on vegetation, and the contributions of snow geese to these processes, are necessary to better understand the changes occurring on Banks Island.
Download or read book Remote Sensing of Environmental Changes in Cold Regions written by Jinyang Du and published by MDPI. This book was released on 2019-11-14 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue gathers papers reporting recent advances in the remote sensing of cold regions. It includes contributions presenting improvements in modeling microwave emissions from snow, assessment of satellite-based sea ice concentration products, satellite monitoring of ice jam and glacier lake outburst floods, satellite mapping of snow depth and soil freeze/thaw states, near-nadir interferometric imaging of surface water bodies, and remote sensing-based assessment of high arctic lake environment and vegetation recovery from wildfire disturbances in Alaska. A comprehensive review is presented to summarize the achievements, challenges, and opportunities of cold land remote sensing.
Download or read book Productivity of Lesser Snow Geese on Banks Island Northwest Territories Canada in 1995 1998 written by Gustaf Samelius and published by . This book was released on 2008 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: "We estimated that 264 000-452 000 Lesser Snow Geese Chen caerulescens caerulescens nested at Egg Riveron Banks Island, Northwest Territories, in 1995-1998. This was about twice as many geese as was reported nesting there in the 1980s, and we estimated that the nesting population grew by 4.2% per year from 1953 to 1998"--Abstract.
Download or read book Arctic Ecosystems in Peril written by Bruce D. J. Batt and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fall Migration of Blue Geese chen Caerulescens and Lesser Snow Geese chen Hyperborea Hyperborea from the Koukdjuak River Baffin Island Northwest Territories written by Louis Lemieux and published by . This book was released on 1967 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Migration of Waterfowl written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Lesser Snow Goose Herbivory on Above and Belowground Nutrient Dynamics in Two Sub Arctic Ecosystems written by Emma J. Horrigan and published by . This book was released on 2010 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to determine the impact of lesser snow goose ( Chen caerulescens caerulescens) herbivory on above and belowground nutrient dynamics, a grazing and nutrient addition experiment was conducted in two habitat types utilized by snow geese near Churchill, Manitoba. Forage plant nutrition, soil microbial biomass, and inorganic and organic soil nutrients were measured in relation to the timing of grazing, over two consecutive summers. Soil was collected from the rhizosphere to determine the influence of foliar herbivory on root-microbe interactions. Primary productivity in both habitats is co-limited by the availability of both nitrogen (N) and phosphorus (P). Aboveground defoliation either caused a reduction or no change in soil microbial biomass nutrients (carbon (C), N, or P). Defoliated shoots had higher N concentrations and did not show compensatory growth within the season. Root biomass was somewhat reduced with grazing, but higher whole plant N content suggests that grazing does not compromise N-uptake.
Download or read book Greater Snow Goose Chen Caerulescens written by Canada. Environment Canada and published by Environment Canada. This book was released on 2005 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Canada Goose Branta Canadensis and Snow Goose Chen Caerulescens Herbivory on Tidal Marsh Recession at the Westham Island Marsh written by Gadwyn Gan and published by . This book was released on 2021 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Fraser River Estuary of British Columbia, tidal marshes have been receding and converting into unvegetated mudflats since the 1980s. While there are many hypotheses for this recession, the effect of avian herbivory is poorly understood. This study assessed how Canada Goose (Branta canadensis) and Snow Goose (Chen caerulescens) herbivory affected cover of tidal marsh vegetation that was comprised mainly of three-square bulrush (Schoenoplectus pungens) in the Westham Island tidal marsh. I conducted two field-based exclosure experiments, marsh edge and mudflat, that used exclosure plots to reduce specific goose herbivory in a randomized block design. Each experiment consisted of four blocks each of which was comprised of four treatments: open to goose herbivory, excluded all goose herbivory, primarily excluded Canada Goose herbivory, or primarily excluded Snow Goose herbivory. The marsh edge experiment used exclosures centered on the vegetated edge of the marsh, while the mudflat experiment was conducted in the unvegetated mudflat and were transplanted with S. pungens. Based on results from July to October of 2020, percent cover of tidal marsh vegetation was about 20% lower in plots open to Canada Goose herbivory versus those that excluded geese. Snow Goose herbivory could not be accurately assessed as they arrived when S. pungens were dormant. Thus, deterring goose herbivory may be an important consideration for land managers in restoring tidal marshes. Additionally, I compared percent cover from drone-derived remote sensing to traditional ground-based visual estimates of percent cover of S. pungens in the tidal marsh. One per month, from July to October of 2020, I used a drone to take photos of the exclosures from the previous experiments, and used pixel counts to calculate the percent cover of S. pungens. I then used a t-test to compare the drone-derived percent cover to the ground-based estimates and found no significant difference (t = 0.58, p = 0.56). I then plotted a linear regression model and found a strong correspondence between both methods (R2 = 0.99, p = 1.3e-139). So, remote sensing using drones appears to be an effective alternative to visual estimates of percent cover of tidal-marsh vegetation in the Westham island tidal marsh.
Download or read book Adaptive Significance of Egg Size Variation in Lesser Snow Geese Chen Caerulescens Caerulescens on Akimiski Island Nunavut written by Steven Thomas Adrian Timmermans and published by . This book was released on 2000 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lesser Snow Goose Colonies in the Pelly Lake Area Northwest Territories written by Canadian Wildlife Service and published by . This book was released on 1988 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Migration of Waterfowl written by Canada. Environment Canada and published by [Ste-Foy, Québec] : Environment Canada. This book was released on 2005 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Modelling and Management of Snow Geese written by H. Boyd and published by . This book was released on 2000 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document consists of three separate but related papers. The objective of the first is to improve managerial understanding of the impact of spring hunting by indigenous peoples in northern Canada. It is an analysis of the relative impact of hunting in the spring, compared with the conventional hunting seasons in fall and winter. In the second paper, Cooke et al. comments on the model and the choice of parameters that was used in a paper by Rockwell et al., and which provided the underpinning for the argument in that paper that a great increase in the hunting kill of Snow Geese was required to reverse the rapid increase in the numbers of those geese. In the third paper, Rockwell and Ankney counter Cooke's claims.
Download or read book Lesser Snow Goose Colonies in the Pelly Lake Area Northwest Territories written by Canadian Wildlife Service and published by . This book was released on 1988 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Breeding Lesser Snow Geese (Anser caerulescens) were first recorded in the Pelly Lake area in July 1984"--Introduction.
Download or read book The Lesser Snow Geese of the Eastern Canadian Arctic written by H. Boyd and published by Canadian Wildlife Service. This book was released on 1982 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimates of hunting kill, band recoveries, and aerial surveys of wintering places are used to describe the status of lesser snow geese, Anser c. caerulescens, breeding in eastern arctic Canada during 1964-79.
Download or read book The Effect of Plumage Coloration on the Thermoregulatory Abilities of Lesser Snow Goose Chen Caerulescens Caerulescens Goslings written by Barbara Anne Beasley and published by . This book was released on 1986 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Regions of North America written by and published by . This book was released on 1997 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume represents a first attempt at holistically classifying and mapping ecological regions across all three countries of the North American continent. A common analytical methodology is used to examine North American ecology at multiple scales, from large continental ecosystems to subdivisions of these that correlate more detailed physical and biological settings with human activities on two levels of successively smaller units. The volume begins with an overview of North America from an ecological perspective, concepts of ecological regionalization. This is followed by descriptions of the 15 broad ecological regions, including information on physical and biological setting and human activities. The final section presents case studies in applications of the ecological characterization methodology to environmental issues. The appendix includes a list of common and scientific names of selected species characteristic of the ecological regions.
