Treesearch

Showy goldeneye is a western species. Variety multiflora is the most widely distributed, occurring in Montana, Idaho, Wyoming, Colorado, Utah, Nevada, Arizona, New Mexico, and Texas. Variety nevadensis is more southerly, occurring in California, Nevada, Utah, Arizona, New Mexico, and as far south as Jalisco, Mexico. Variety brevifolia occurs in Utah, Arizona, and New Mexico (Schilling 2006). Variety multiflora is found at higher elevations or in moister habitats than variety nevadensis where their distributions overlap (Cronquist 1994). In Montana, variety multiflora is primarily found in...

Arrowleaf balsamroot is primarily a western species occurring from the Cascade and Sierra Nevada mountain ranges to the Black Hills of South Dakota. It is found in the Canadian provinces of Alberta, British Columbia, and Saskatchewan and in the U.S. states of Arizona, California, Colorado, Idaho, Montana, Nevada, Oregon, South Dakota, Utah, and Wyoming (USDA FS 1937; Weber 2006). It is particularly widespread east of the Cascades at low to mid-elevations (Hitchcock and Cronquist 1973).PDF UPDATED: FEBRUARY 2024.

Hoary tansyaster is common and broadly distributed throughout western North America, ranging from southern British Columbia south to Baja California and east to western North Dakota, western Texas, and Chihuahua, Mexico (Cronquist et al. 1994; Morgan 2006). Variety canescens is the most widespread of the varieties, most of which have much more limited distributions (Table 1; Morgan 2006).PDF UPDATED: MAY 2024.

Multispectral LiDAR (light detection and ranging) data have been initially used for land cover classification. However, there are still high classification uncertainties, especially in urban areas, where objects are often mixed and confounded. This study investigated the efficiency of combining advanced statistical methods and LiDAR metrics derived from multispectral LiDAR data for improving land cover classification accuracy in urban areas. The study area is located in Oshawa, Ontario, Canada, on the Lake Ontario shoreline. Multispectral Optech Titan LiDAR data over the study area were...

Growth rhythm that is well synchronized with seasonal changes in local climatic conditions is understood to enhance fitness; however, rapid ongoing climate change threatens to disrupt this synchrony. To evaluate phenotypic selection on growth rhythm under expected warmer and drier future climate, seedlings from 49 populations of whitebark pine (Pinus albicaulis Engelm.) were grown and measured over more than 10 years in two common garden field experiments on sites that approximate the projected future climate of the seed origins. Selection on growth rhythm was assessed by relating individua...

Regional scale maps of homogeneous forest stands are valued by forest managers and are of interest for landscape and ecological modelling. Research focused on stand delineation has substantially increased in the last decade thanks to the development of Geographic Object Based Image Analysis (GEOBIA). Nevertheless, studies focused on even-age dominated forests are still few and the proposed approaches are often heuristic, local, or lacking objective evaluation protocols. In this study, we present a two-stage evaluation strategy combining both unsupervised and supervised evaluation methods...

Rocky Mountain red foxes Vulpes vulpes macroura potentially encounter other red fox Vulpes vulpes lineages at lower elevations, which may include nonindigenous red foxes derived from fur farms. Introgression from nonindigenous red foxes could have negative evolutionary consequences for the rare Rocky Mountain red fox subspecies. Red foxes at high elevations in the Greater Yellowstone Ecosystem exhibit lighter coat colors than those at lower elevations, potentially indicating that they represent the indigenous subspecies and that gene flow across the elevational gradient is restricted. We...

Despite advances in restoration of degraded lands around the world, native plants are still underutilized. Selection of appropriate plant materials is a critical factor in determining plant establishment and persistence. To better inform decision-making, we examined cold-hardiness dynamics, flowering phenology, and survival among five geographically distinct sulfur-flower buckwheat (Polygonaceae: Eriogonum umbellatum Torr.) populations in a common garden. LT50 (a measure of freezing injury) was determined every 6 weeks across a complete year; one population was also evaluated at the...

We developed and applied a wildfire simulation package in the Envision agent-based landscape modelling system. The wildfire package combines statistical modelling of fire occurrence with a high-resolution, mechanistic wildfire spread model that can capture fine scale effects of fire feedbacks and fuel management, and replicate restoration strategies at scales that are meaningful to forest managers. We applied the model to a landscape covering 1.2 million ha of fire prone area in central Oregon, USA where wildland fires are increasingly impacting conservation, amenity values and developed...

The Sturgeon chub (Macrhybopsis gelida) is a cyprinid fish native to the Missouri and Mississippi River basins of the U.S. Suspected long-term declines in the size of its distribution have prompted a review of its conservation status by the U.S. Fish and Wildlife Service, a process which depends on reliable methods to delineate the distribution and status of extant populations. To facilitate monitoring of Sturgeon chub populations, we developed a quantitative PCR assay to detect Sturgeon chub DNA in environmental samples. The assay consistently detected Sturgeon chub DNA in concentrations...