Filters: Tags: Great Basin (X)614 results (286ms)
Accurate and consistent estimates of shrubland ecosystem components are crucial to a better understanding of ecosystems condition in arid and semiarid lands. We developed an innovative approach by integrating multiple information to quantify shrubland components as continuous field products within the National Land Cover Database (NLCD). The approach consists of five major parts: field sample collection, high-resolution mapping of shrubland components using WorldView-2 imagery and regression tree models, Landsat 8 radiometric balancing and phenological mosaicking, coarse resolution estimate of shrubland components across a large geographic extent using Landsat 8 phenological mosaics and regression tree models, and...
Knowing where a species is found or may be found in the future is critical to developing a successful habitat conservation plan. This quick guide reviews correlation-based and process-based species distribution models and their uses in the context of HCPs. It also addresses considerations for evaluating species distribution models, using multiple models, and working with model uncertainty. Examples are provided.
With HCPs, reserves are created as one means of mitigating take. This means they are designed to provide a target level of benefits for a particular species or set of species. This quick guide reviews approaches for designing and implementing reserves that address climate change impacts, vulnerabilities, and uncertainty. Examples are provided.
Speaker: Dr. Keirith Snyder, USDA ARS, Great Basin Rangelands Research Unit, Reno, NV The opportunistic encroachment of native pinyon and juniper trees into areas formerly dominated by sagebrush has reduced the presence of shrubs and grasses, impacting critical habitat and forage availability. Pinyon and juniper currently occupy 19 million hectares in the Intermountain West. Prior to 1860, it is estimated that 2/3 of pinyon and juniper woodlands were sagebrush communities. This presentation will give an overview of the Porter Canyon Experimental Watershed, where tree-felling treatments are being studied. Porter Canyon is located in central Nevada in the Desatoya Mountains. A network of sensors has been installed...
Journal Article: Pika (Ochotona princeps) losses from two isolated regions reflect temperature and water balance, but reflect habitat area in a mainland region
Although biotic responses to contemporary climate change are spatially pervasive and often reflect synergies between climate and other ecological disturbances, the relative importance of climatic factors versus habitat extent for species persistence remains poorly understood. To address this shortcoming, we performed surveys for American pikas (Ochotona princeps) at > 910 locations in 3 geographic regions of western North America during 2014 and 2015, complementing earlier modern (1994–2013) and historical (1898–1990) surveys. We sought to compare extirpation rates and the relative importance of climatic factors versus habitat area for pikas in a mainland-versus-islands framework. In each region, we found widespread...
Webinar: Relations among cheatgrass-driven fire, climate and sensitive-status birds across the Great Basin
This presentation aired as part of the Great Basin LCC webinar series on October 11, 2017. Speakers included Erica Fleishman, U.C. Davis, and Jimi Gragg, Utah Division of Wildlife Resources.Description: As the distribution and abundance of non-native cheatgrass (Bromus tectorum) in the Great Basin has increased, the extent and frequency of fire in the region has increased by as much as 200%. These changes in fire regimes are associated with loss of the sagebrush (Artemisia tridentata) and native grasses and forbs in which many native animals, including Greater Sage-grouse (Centrocercus urophasianus), breed and feed. Managers have suggested changes in fire regimes, fuels treatments and post-fire restoration with...
This folder is used to organize and make available interim reports such as annual and progress reports and preliminary webinar presentations for Building Tribal Capacity for Climate Change Vulnerability Assessment supported by the Great Basin Landscape Conservation Cooperative.
This folder is used to organize and make available project documents such as proposals and data management plans for Evaluation of Common Gardens to provide Information on Seed Transfer Among Landscapes supported by the Great Basin Landscape Conservation Cooperative.
Journal Article: Cheatgrass die-off as an opportunity for restoration in the Great Basin, USA: Will local or nonlocal commercial native plants succeed where exotic invaders fail?
Bromus tectorum (cheatgrass) has widely invaded the Great Basin, U.S.A. The sporadic natural phenomenon of complete stand failure (‘die- off’) of this invader may present opportunities to restore native plants. A recent die-off in Nevada was precision-planted with seeds of the native grasses Poa secunda (Sandberg bluegrass) and Elymus elymoides (bottlebrush squirreltail), of both local and nonlocal origin, to ask: 1) Can native species be restored in recent B. tectorum die-offs? And 2) Do local and nonlocal seeds differ in performance? Additionally, we asked how litter removal and water addition affected responses. Although emergence and growth of native seeds was lower in die-off than control plots early in year...
This folder is used to organize and make available project documents such as proposals and data management plans for Measuring the Regional Impacts of Pinyon and Juniper Removal on Insect, Bat, and Reptile Communities supported by the Great Basin Landscape Conservation Cooperative.
This folder is used to organize and make available interim reports such as annual and progress reports and preliminary webinar presentations for Measuring the Regional Impacts of Pinyon and Juniper Removal on Insect, Bat, and Reptile Communities supported by the Great Basin Landscape Conservation Cooperative.
This folder is used to organize and make available final products such as peer-reviewed journal articles, final reports and web-based tools and analyses for Near-real-time Herbaceous Annual Cover in the Great Basin supported by the Great Basin Landscape Conservation Cooperative.
This folder is used to organize and make available interim reports such as annual and progress reports and preliminary webinar presentations for Planning for the future of the Great Basin: Using spatially-based planning to inform climate resiliency planning and adaptation strategies supported by the Great Basin Landscape Conservation Cooperative.
Journal Article: Genetically distinct populations of the pygmy rabbit (Brachylagus idahoensis) in the Mono Basin of California
We examined patterns of genetic variation and diversity of extant pygmy rabbit (Brachylagus idahoensis) populations across the species’ current range in Nevada and California. Our aims were to determine population genetic structure and levels of diversity across the southern portion of the species’ range. We genotyped 13 microsatellite loci from 194 fecal samples collected across 14 localities. Our Bayesian cluster analyses found 2 genetically distinct groups: 1 in the Mono Basin of California and the other encompassing all remaining Nevada Great Basin populations. Considering only the Nevada Great Basin group, we found 4 minimally divergent groups that overlap spatially with many individuals maintaining composite...
Journal Article: Great Basin land managers provide detailed feedback about usefulness of two climate information web applications
Land managers in the Great Basin are working to maintain or restore sagebrush ecosystems as climate change exacerbates existing threats. Web applications delivering climate change and climate impacts information have the potential to assist their efforts. Although many web applications containing climate information currently exist, few have been co-produced with land managers or have incorporated information specifically focused on land managers’ needs. Through surveys and interviews, we gathered detailed feedback from federal, state, and tribal sagebrush land managers in the Great Basin on climate information web applications targeting land management. We found that a) managers are searching for weather and climate...
Webinar: Northwest Basin and Range Landscape Conservation Project Identifying shared landscape values
The goal of the Northwest Basin and Range (NWBR) Synthesis project is to synthesize existing landscape planning and science and develop a shared conservation vision for stakeholders in the region. This webinar provides an overview of the NWBR Synthesis’ work to identify shared conservation priorities, including: - The Open Standards for the Practice of Conservation framework - How the NWBR is using the framework to synthesize current landscape planning and science - How experts will vet this process
This dataset includes the magnetotelluric (MT) sounding data collected in 2003 along a north-south profile west of Wendover, Nevada. It is important to know whether major mining districts in the Northern Nevada Gold Province are underlain by rocks of the Archean Wyoming craton, which are known to contain orogenic gold deposits, or by accreted rocks of the Paleoproterozoic Mojave province. It is also important to know the location and orientation of the Archean/Proterozoic suture zone between these provinces as well as major basement structures within these terranes because they may influence subsequent patterns of sedimentation, deformation, magmatism, and hydrothermal activity. This study was funded by the U.S....
This folder is used to organize and make available interim reports such as annual and progress reports and preliminary webinar presentations for Developing Usable Climate Tools for Land Managers supported by the Great Basin Landscape Conservation Cooperative.
The study's goal was to downscale 2013 250-m expedited Moderate Resolution Imaging Spectroradiometer (eMODIS) Normalized Difference Vegetation Index (NDVI) to 30 m (Gu, Y. and Wylie, B.K., 2015, Developing a 30-m grassland productivity estimation map for central Nebraska using 250-m MODIS and 30-m Landsat-8 observations, Remote Sensing of Environment, v. 171, p. 291-298)using 2013 Landsat 8 data. The eMODIS NDVI was downscaled for four periods: mid spring, early summer, late summer and mid fall. The objective was to capture phenologies during periods that correspond to 1) annual grass growth, 2) annual grass senescence, 3) the optimal NDVI profile separation between sagebrush and other shrubs in the region, and...
The data reflect surveys from 10-year sampling frames established as part of the Sagebrush Steppe Treatment Evaluation Project. The project tests fuel reduction treatments on the lichen and moss components of biocrusts across the sagebrush steppe.