Filters: Tags: Monitoring 1-Changes in Plant and Animal Distribution: Flora (X)222 results (251ms)
Relations between water physico-chemistry and benthic algal communities in a northern Canadian watershed: defining reference conditions using multiple descriptors of community structure
Soil nitrogen accretion along a floodplain terrace chronosequence in northwest Alaska: Influence of the nitrogen-fixing shrub Sherpherdia canadensis
Nitrogen enters terrestrial ecosystems through multiple pathways during primary succession. We measured accumulation of total soil nitrogen and changes in inorganic nitrogen (N) pools across a 300-y sequence of river terraces in northwest Alaska and assessed the contribution of the nitrogen-fixing shrub Shepherdia canadensis. Our work compared 5 stages of floodplain succession, progressing from a sparsely vegetated silt cap to dense shrubby vegetation, balsam poplar-dominated (Populus balsamifera) and white spruce-dominated (Picea glauca) mixed forests, and old-growth white spruce forest. Total soil N (0–30 cm depth) increased throughout the age sequence, initially by 2.4 g N·m−2·y−1 during the first 120 y of terrace...
Species concepts in the pixie cup lichens, Cladonia pyxidata and Cladonia pocillum (Cladoniaceae, Ascomycotina)
Cladonia pyxidata and Cladonia pocillum are commonly referred to as "pixie cup" lichens. The species are mainly delimited by the morphology of the basal squamules, which are upright and separate or form a rosette-like pattern, respectively. Cladonia pyxidata is reported to prefer acidic soils, whereas C. pocillum grows exclusively on basic soils. By examining the morphological and genetic variation of C. pyxidata and C. pocillum , we assess their species status. We also examine whether the variation in morphology correlates with a change in soil pH. Samples from the Cladonia pyxidata group were collected from across Canada. Phylogenetic and population genetic analyses were conducted using 15 morphological characters...
Population dynamics of black spruce and white spruce near the arctic tree line in the southern Brooks Range, Alaska
Influence of the phenolic compound bearing species Ledum palustre on soil N cycling in a boreal hardwood forest
Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Fish, Invertebrates, Monitoring 1-Changes in Plant and Animal Distribution: Fauna, Monitoring 1-Changes in Plant and Animal Distribution: Fauna, Monitoring 1-Changes in Plant and Animal Distribution: Flora
A study of the aquatic fungi in streams of the Kantishna Hills, Denali National Park and Preserve, AK
Brief summary of plant inventory in vicinity of Grizzly Lake published in park newspaper.
The University of Alaska Anchorage, Alaska Natural Heritage Program agreed to conduct a vascular plant survey of the proposed UNAVCO Plate Boundary Observatory GPS monument site at Slope Mountain in Lake Clark National Park and Preserve. The need for a plant survey was precipitated by the discovery of a number of rare plants found on surrounding peaks during vascular plant inventories in 2003 and 2005 (see Carlson et al. 2005 for details). The survey of the UNAVCO site on the northeast peak of Slope Mountain did not reveal any imperiled or critically imperiled vascular plant species. Here, I briefly outline the background of the project and rare plant concerns in the area, location and habitat of the site, survey...
Evidence of soil nutrient availability as the proximate constraint on growth of treeline trees: Reply
Interspecies and interregional comparisons of the chemistry of PAHs and trace elements in mosses Hylocomium splendens (Hedw.) B.S.G. and Pleurozium schreberi (Brid.) Mitt. from Poland and Alaska
Comparative biogeochemical studies performed on the same plant species in remote areas enable pinpointing interspecies and interregional differences of chemical composition. This report presents baseline concentrations of PAHs and trace elements in moss species Hylocomium splendens and Pleurozium schreberi from the Holy Cross Mountains (south-central Poland) (HCM) and Wrangell–Saint Elias National Park and Preserve (Alaska) and Denali National Park and Preserve (Alaska). Total PAH concentrations in the mosses of HCM were in the range of 473–2970 mg kg1 (dry weight basis; DW), whereas those in the same species of Alaska were 80–3390 mg kg1 DW. Nearly all the moss samples displayed the similar ring sequence: 3 > 4...
Differences in Ecosystem Carbon Distribution and Nutrient Cycling Linked to Forest Tree Species Composition in a Mid-Successional Boreal Forest
In North America, the last ice age is the most recent event with severe consequences on boreal species’ ranges. Phylogeographic patterns of range expansion in trembling aspen (Populus tremuloides) suggested that Beringia is likely to be a refugium and the “ice-free corridor” in Alberta may represent a region where small populations persisted during the last glacial maximum (LGM). The purpose of this study was to ascertain whether the origins of trembling aspen in western North America are reflected in the patterns of neutral genetic diversity and population structure. A total of 28 sites were sampled covering the northwestern part of aspen’s distribution, from Saskatchewan to Alaska. Twelve microsatellite markers...
White spruce regeneration following a major spruce beetle outbreak in forests on the Kenai Peninsula, Alaska
Aspen phenology monitoring in the Central Alaska Network of the National Park Service: Progress report 2010
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...
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.