Filters: Tags: M1-Flora (X)
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All vegetation related projects conducted from 1982 to 2001 which had a monitoring component are listed. Projects are categorized as either current or historic activities, then further categorized by year. Projects that may be useful for baseline data, but were not designed with a monitoring component were excluded, such as the 1984 park-wide ATV trail inventory and the 1996 Nabesna ATV trail assessment.
Abstract. We compared the species composition and species density of vascular plants in the understorey vegetation of boreal forest between Picea mariana (Black spruce) and Populus tremuloides (Trembling aspen) stands in British Columbia, Canada, and related differences in species composition and species density between the two forest types to dominant canopy tree species as well as a wide variety of environmental factors. We analysed 231 stands, distributed in three different climatic regions representing drier, wetter, and milder variations of montane boreal climate. Of these stands 118 were dominated by P. mariana and 113 by P. tremuloides. P. tremuloides stands had higher species density than P. mariana stands...
Categories: Publication;
Types: Citation;
Tags: B4-Ecological Land Classification Scheme,
M1-Ecosystems,
M1-Flora
The North America boreal forest extends across more than 10° of latitude from central Labrador to interior Alaska. Periods of major climate fluctuations, including glacial and interglacial cycles, drove major migrations in the Quaternary history of the boreal forest. Beringia, the unglaciated region between the Lena and Mackenzie rivers, is recognized as an important refugium for arctic plants during the last ice age, but its role for boreal trees remains controversial. The paleobotanical record indicates Populus balsamifera (balsam poplar) survived within Beringia during the last glacial. My research employed an interdisciplinary approach, combining techniques in the fields of ecology, evolution and population...
1.?Ecosystem properties may be determined by the number of different species or groups of species in a community, the identity of those groups, and their relative abundance. The mass ratio theory predicts that the effect of species or groups of species on ecosystem properties will be dependent on their proportional abundance in a community. 2.?Single plant functional groups (graminoids, legumes, non-leguminous forbs) were removed from a natural grassland in northern Canada to examine the role of group identity in determining both ecosystem properties and biomass compensation by remaining species. Removals were conducted across two different environmental treatments (fertilization and fungicide) to examine the context...
Categories: Publication;
Types: Citation;
Tags: B4-Ecological Land Classification Scheme,
M1-Ecosystems,
M1-Flora
The diversity and characteristics of species within Inocybe section Inocybe Singer were investigated in Finland. As a result, 11 species are described here as new: Inocybe acutoides, I. amicta, I. boreocarelica, I. bufonia, I. ericetorum, I. kittilensis, I. lapponica, I. paludicola, I. porcorum, I. pseudoteraturgus, and I. silvae-herbaceae. Detailed macroscopic and microscopic descriptions, habitat information, and ITS sequence data are included. The new species are compared with each other and with similar species within the section, and a key is provided for the European boreal species. The types of Inocybe acuta, I. alpigenes, I. borealis, I. cicatricata, I. giacomi, I. heterochrominea, I. hinnulea, I. johannae,...
Categories: Publication;
Types: Citation;
Tags: M1-Changes in Plant and Animal Distributon,
M1-Flora
Atmospheric nitrogen (N) fixation by Alnus tenuifolia can account for up to 70% of the N accumulated during vegetation development along river floodplains in interior Alaska. We assessed disease incidence and related mortality of a recent outbreak of fungal stem cankers on A. tenuifolia across three regions in Alaska during the 2005 growing season, and determined the impacts on N-fixation rates, nodule biomass, and stand-level N-fixation inputs. The highest percentage of ramets colonized or dead with canker was found on Tanana River plots, suggesting the epidemic is most severe in the Fairbanks region. A positive relationship between % basal area loss to canker and % canopy loss provides a simple means for assessing...
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...
Fungi influence nutrient cycling in terrestrial ecosystems, as they are major regulators of decomposition and soil respiration. However, little is known about the substrate preferences of individual fungal species outside of laboratory culture studies. If active fungi differ in their substrate preferences in situ, then changes in fungal diversity due to global change may dramatically influence nutrient cycling in ecosystems. To test the responses of individual fungal taxa to specific substrates, we used a nucleotide-analogue procedure in the boreal forest of Alaska (USA). Specifically, we added four organic N compounds commonly found in plant litter (arginine, glutamate, lignocellulose, and tannin-protein) to litterbags...
Categories: Publication;
Types: Citation;
Tags: M1-Changes in Plant and Animal Distributon,
M1-Flora,
P2-Changes in Plant and Animal Species Due to Climate Change
Predator satiation resulting from interannual reproductive synchrony has been widely documented in masting plants, but how reproductive synchrony within a year influences seed escape is poorly understood. We evaluated whether the intra-annual reproductive synchrony of individual white spruce trees (Picea glauca) increased seed escape from their primary predispersal seed predator, North American red squirrels (Tamiasciurus hudsonicus). Trees with cones that matured synchronously relative to those of other trees within red squirrel territories were significantly more likely to escape squirrel predation in years with both low and superabundant levels of cone production, generating a significantly positive linear selection...
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