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Filters: Tags: Monitoring 1-Changes in Plant and Animal Distribution: Flora (X)

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Here we quantitatively summarize the conservation ecology of one group of dead-wood-dependent organisms, the polyporous fungi, in boreal Europe. At the substrate scale, the decay stage is the strongest determinant of species richness, with large (>20 cm diameter) downed logs hosting more species than other dead-wood types. At the stand scale, the amount of dead wood is the strongest determinant of polypore species richness; the minimum average amount of dead wood for the occurrence of rare polypores appears to be 20–40 m3/ha. Species-area analysis shows that in mature boreal forests species accumulation levels off at around 20–30 ha. This leads us to suggest a heuristic 20/20/20 rule of thumb: a 20 ha stand, with...
Lodgepole pine (Pinus contorta var. latifolia) stands were sampled in central Yukon, Canada (61.5?64°N latitude), which represented the northernmost 9% of the tree's North American range. Within this area, lodgepole pine occupied only ? 2% of the landscape. This study determined: 1) what forest sociations occurred (i.e. structural dominance-types); 2) how plant growth form composition and richness differed from the central portion of the species? geographical range; and 3) if stands were biased towards occurring on more thermally favorable south-facing slopes. Five lodgepole pine sociations were recognized among 100 relevés: Rhododendron groenlandicum (Labrador tea); Cladonia arbuscula (green reindeer lichen); Calamagrostis...
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Species distributions have often been assumed to represent climatic limitations, yet recent evidence has challenged these assumptions and emphasized the potential importance of biotic interactions, dispersal limitation, and disturbance. Despite significant investigation into these factors, an integrated understanding of where and when they may be important is lacking. Here, we review evidence for the factors underlying the historical and contemporary distributions of North American tree species and argue that a cohesive conceptual framework must be informed by an understanding of species ecological and evolutionary history. We further demonstrate that available evidence offers little indication of a significant,...
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We examined the phenology, or the timing of biological events, in aspen trees in interior Alaska. Specifically, we observed the dates of leaf out, flowering and fall senescence in aspen in plots in parks within the Central Alaska Network. We first examined six years of aspen phenology observations taken from two very different areas (one a steep, dry, south-facing area and one a flat, mesic area) within Denali National Park. We then compared the phenology of aspen from similar habitats (both flat and mesic) in different parks: Denali National Park and Wrangell St. Elias National Park. We made correlations between climate variables and phenology benchmarks. We also investigated differences in flowering and bud burst...
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Describes the 74 rare plants known to occur in the park with distribution maps, habitat photos, line drawings, park and global distributions, habitat, distinguishing characters and references.
Describes status of FIREPRO vegetation plot data, reports and databases. Provides structure of database, print-out of records, map of plots and notes on data entry. The database summarizes what is known about each vegetation plot.
Ectomycorrhizal (ECM) fungi, like wood and litter decaying fungi, are believed to produce extracellular oxidative enzymes. Oxidative enzymes associated with lignin degradation have been demonstrated to effectively degrade recalcitrant organic compounds, including chlorinated pesticides and polycyclic aromatic hydrocarbons (PAHs). This thesis describes a suite of experiments investigating ECM fungi lignolytic enzymes and the fate of organochlorine pesticide in Alaskan ECM fungal cultures. In this study, molecular techniques were employed to assess the potential of Alaskan ECM fungal cultures to produce the lignolytic enzymes lignin peroxidase (LiP), manganese peroxidase (MnP), and laccase (Lac). ECM mycelia were...
map background search result map search result map Timing for success: expression phenotype and local adaptation related to latitude in the boreal forest tree, Populus balsamifera Aspen phenology monitoring in the Central Alaska Network of the National Park Service: Progress report 2010 Middle Teklanika River Mini-Grid Vegetation Data Summary and Analysis A field guide to the rare vascular flora of Wrangell-St Elias National Park and Preserve, Alaska Schistidium relictum (Grimmiaceae, Bryophyta), a new moss species from Northwest North America and Siberia Timing for success: expression phenotype and local adaptation related to latitude in the boreal forest tree, Populus balsamifera Middle Teklanika River Mini-Grid Vegetation Data Summary and Analysis Schistidium relictum (Grimmiaceae, Bryophyta), a new moss species from Northwest North America and Siberia A field guide to the rare vascular flora of Wrangell-St Elias National Park and Preserve, Alaska Aspen phenology monitoring in the Central Alaska Network of the National Park Service: Progress report 2010