971 resultados para Steamboats -- Great Lakes (North America) -- History.
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Tryon's official letter book containing copies of letters and documents relating to his work as colonial governor of North Carolina; with references concerning drawing a boundary between North Carolina and South Carolina; talks with the Cherokee Indians; the establishment of a postal service; working with the Propagation of the Gospels in Foreign Parts; establishing the Church of England in North Carolina; strengthening the defenses of the colony; maintaining better communication with Great Britain; and other events.
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1Recent studies demonstrated the sensitivity of northern forest ecosystems to changes in the amount and duration of snow cover at annual to decadal time scales. However, the consequences of snowfall variability remain uncertain for ecological variables operating at longer time scales, especially the distributions of forest communities. 2The Great Lakes region of North America offers a unique setting to examine the long-term effects of variable snowfall on forest communities. Lake-effect snow produces a three-fold gradient in annual snowfall over tens of kilometres, and dramatic edaphic variations occur among landform types resulting from Quaternary glaciations. We tested the hypothesis that these factors interact to control the distributions of mesic (dominated by Acer saccharum, Tsuga canadensis and Fagus grandifolia) and xeric forests (dominated by Pinus and Quercus spp.) in northern Lower Michigan. 3We compiled pre-European-settlement vegetation data and overlaid these data with records of climate, water balance and soil, onto Landtype Association polygons in a geographical information system. We then used multivariate adaptive regression splines to model the abundance of mesic vegetation in relation to environmental controls. 4Snowfall is the most predictive among five variables retained by our model, and it affects model performance 29% more than soil texture, the second most important variable. The abundance of mesic trees is high on fine-textured soils regardless of snowfall, but it increases with snowfall on coarse-textured substrates. Lake-effect snowfall also determines the species composition within mesic forests. The weighted importance of A. saccharum is significantly greater than of T. canadensis or F. grandifolia within the lake-effect snowbelt, whereas T. canadensis is more plentiful outside the snowbelt. These patterns are probably driven by the influence of snowfall on soil moisture, nutrient availability and fire return intervals. 5Our results imply that a key factor dictating the spatio-temporal patterns of forest communities in the vast region around the Great Lakes is how the lake-effect snowfall regime responds to global change. Snowfall reductions will probably cause a major decrease in the abundance of ecologically and economically important species, such as A. saccharum.
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At head of title: 1636--Pocumtuch--1886.
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At head of title: Department of the Interior.
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Disbound Original Held in Oak Street Library Facility.
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Mode of access: Internet.
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"No. 64 of 150 copies printed. Also 10 copies printed on Japan vellum."
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v. 1. The Red river of the North.--v. 2. The Saskatchewan and Columbia rivers.--v. 3. Index and maps.
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Originally pub. in weekly numbers, under title, The American library.
Resources of Sisseton Reservation Area, (Lake Traverse Reservation) : history - present - potential.
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"May 1969."
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Includes index.
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Mode of access: Internet.
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An abridgment of the author's "Information respecting the history, condition and prospects of the Indian tribes of the United States," with additions by the editor.
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Earlier editions appeared under title: The People's history of America.
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Mode of access: Internet.