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Mast-seeding conifers such as Picea glauca exhibit synchronous production of large seed crops over wide areas, suggesting climate factors as possible triggers for episodic high seed production. Rapidly changing climatic conditions may thus alter the tempo and spatial pattern of masting of dominant species with potentially far-reaching ecological consequences. Understanding the future reproductive dynamics of ecosystems including boreal forests, which may be dominated by mast-seeding species, requires identifying the specific cues that drive variation in reproductive output across landscape gradients and among years. Here we used annual data collected at three sites spanning an elevation gradient in interior Alaska,...
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A reconnaissance inventory of the vascular plant flora of Denali National Park and Preserve was conducted during the period 1998-2001. The primary goal of this project was to synthesize existing floristic information with the results of targeted original inventory field work in order to produce a voucher-based list of the vascular plant species that occur within the Park. In order to accomplish this fundamental goal of documenting the flora of Denali National Park and Preserve there were five major objectives that needed to be met: 1) to assemble all available pre-existing floristic data into a highly functional database; 2) to assess the strengths and weaknesses of this existing data set and identify geographic...
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An inventory of the vascular flora north of the Bagley Icefield in Wrangell-St. Elias National Park and Preserve, Alaska, U.S.A., was conducted from 1994 to 1997. The objectives of the inventory were to assess the genetic diversity of the region, identify rare taxa and areas of phytogeographic interest and to assist park managers with planning and environmental compliance. The purpose of this paper is to present annotations for 212 of the most notable taxa with their Alaska-Yukon and Park distribution maps and to summarize the floristics of the Park. 832 species (887 taxa) were documented as occurring within the Park (approximately 54% of the Alaskan flora). Significant results from the inventory include: (1) nine...
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Mast-seeding conifers such as Picea glauca exhibit synchronous production of large seed crops over wide areas, suggesting climate factors as possible triggers for episodic high seed production. Rapidly changing climatic conditions may thus alter the tempo and spatial pattern of masting of dominant species with potentially far-reaching ecological consequences. Understanding the future reproductive dynamics of ecosystems including boreal forests, which may be dominated by mast-seeding species, requires identifying the specific cues that drive variation in reproductive output across landscape gradients and among years. Here we used annual data collected at three sites spanning an elevation gradient in interior Alaska,...
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