993 resultados para Indians of North America--Government relations--To 1789


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"Contains all the printed papers which display the religious principles of the Associate Presbytery of Pennsylvania." -- Pref. signed: William Marshall.

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"The figures and descriptions contained in the work entitled 'The birds of America', and 'Ornithological biography ...' having been issued in the miscellaneous manner which was thought best adapted to the occasion ... seemed to require a systematic index, in which the nomenclature should be corrected, and the species arranged agreeably to my present views. This Synopsis, then, will afford a methodical catalogue of all the species ... described in the works above named."--Pref.

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"Published by the direction of the Grand Chapter."

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A translation of parts relating to America in "Lettres édifiantes et curieuses, ć̄rites des missions étrangères".

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"Answer to the strictures of Mr. T. Falconer": and "Mr. Falconer's reply to Mr. Greenhow's answer, with Mr. Greenhow's rejoinder".

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Published also as Smithsonian contributions to knowledge: v.III, art. 4; v. V, art t; v. X [art. 2]

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The drawings by Mr. Faxon have been engraved (v. 1-5 by Philibert and Eugène Picart) under the direction of A. Riocreux.

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Across North America, grassland songbirds have undergone steep population declines over recent decades, commonly attributed to agricultural intensification. Understanding the potential interactions between the impacts of climate change on the future distributions of these species and the availability of suitable vegetation for nesting can support improved risk assessments and conservation planning for this group of species. We used North American bioclimatic niche models to examine future changes in suitable breeding climate for 15 grassland songbird species at their current northern range limits along the boreal forest–prairie ecotone in Alberta, Canada. Our climate suitability projections, combined with the current distribution of native and tame pasture and cropland in Alberta, suggest that some climate-mediated range expansion of grassland songbirds in Alberta is possible. For six of the eight species projected to experience expansions of suitable climate area in Alberta, this suitable climate partly overlaps the current distribution of suitable land cover. Additionally, for more than half of the species examined, most of the area of currently suitable climate was projected to remain suitable to the end of the century, highlighting the importance of Alberta for the long-term persistence of these species. Some northern prairie-endemic species exhibited substantial projected northward shifts of both the northern and southern edges of the area of suitable climate. Baird’s Sparrow (Ammodramus bairdii) and Sprague’s Pipit (Anthus spragueii), both at-risk grassland specialists, are predicted to have limited climate stability within their current ranges, and their expansion into new areas of suitable climate may be limited by the availability of suitable land cover. Our results highlight the importance of the preservation and restoration of remaining suitable grassland habitat within areas of projected climate stability and beyond current northern range limits for the long-term persistence of many grassland songbird species in the face of climate change.

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Relief shown pictorially.