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Filters: partyWithName: University of New Brunswick (Canada) (X) > Types: Downloadable (X)

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Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
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Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
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Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...


    map background search result map search result map Genetic diversity and population structure of selected black spruce populations from northwestern and southeastern Canada Growth patterns of timberline Picea glauca on a site in the Yukon Plateau: Correlations within tree and between trees Late-Quaternary vegetation histories from Antifreeze and Eikland Ponds, southwestern Yukon Territory, Canada Late-Quaternary vegetation histories from Antifreeze and Eikland Ponds, southwestern Yukon Territory, Canada Growth patterns of timberline Picea glauca on a site in the Yukon Plateau: Correlations within tree and between trees Genetic diversity and population structure of selected black spruce populations from northwestern and southeastern Canada