You are here


The search found 782 results in 6.346 seconds.

Search results

  1. SAVS: A System for Assessing Vulnerability of Species to Climate Change

    Climate change impacts are increasingly apparent among species and ecosystems. To preserve habitats and conserve biodiversity, managers need tools which effectively identify the major consequences of climate change for persistence and management of species and ecosystems.

    rmrs-publisher - August 05, 2014

  2. The ghost of outcrossing past in downy brome, an inbreeding annual grass

    We investigated the frequency of outcrossing in downy brome (Bromus tectorum L.), a cleistogamous weedy annual grass, in both common garden and wild populations, using microsatellite and single nucleotide polymorphic (SNP) markers. In the common garden study, 25 lines with strongly contrasting genotypes were planted in close proximity. We fingerprinted 10 seed progeny from 8 individuals of each line and detected 15 first-generation heterozygotes for a t-value (corrected for cryptic crosses) of 0.0082.

    rmrs-publisher - July 09, 2013

  3. The roles of nearest neighbor methods in imputing missing data in forest inventory and monitoring databases

    Almost universally, forest inventory and monitoring databases are incomplete, ranging from missing data for only a few records and a few variables, common for small land areas, to missing data for many observations and many variables, common for large land areas. For a wide variety of applications, nearest neighbor (NN) imputation methods have been developed to fill in observations of variables that are missing on some records (Y-variables), using related variables that are available for all records (X-variables).

    rmrs-publisher - September 21, 2009

  4. Discrete return lidar in natural resources: Recommendations for project planning, data processing, and deliverables

    Recent years have seen the progression of light detection and ranging (lidar) from the realm of research to operational use in natural resource management. Numerous government agencies, private industries, and public/private stakeholder consortiums are planning or have recently acquired large-scale acquisitions, and a national U.S. lidar acquisition is likely before 2020.

    rmrs-publisher - February 17, 2010

  5. Breeding biology and incremental benefits of outcrossing for the restoration wildflower, Hedysarum boreale Nutt. (Fabaceae)

    Northern sweetvetch (Hedysarum boreale Nutt.) is an herbaceous perennial legume of the Rocky Mountains, USA, whose seed is desired for rehabilitating degraded plant communities. Through experimental pollinations, the necessity of pollinators was shown by the failure of autogamy, despite stigmas first becoming receptive in the bud in close proximity to the dehiscing anthers. Nonetheless, the species proved to be self-fertile, initiating as many fruits through selfing as outcrossing.

    rmrs-publisher - October 04, 2012

  6. Modified technique for processing multiangle lidar data measured in clear and moderately polluted atmospheres

    We present a modified technique for processing multiangle lidar data that is applicable for relatively clear atmospheres, where the utilization of the conventional Kano-Hamilton method meets significant issues. Our retrieval algorithm allows computing the two-way transmission and the corresponding extinction-coefficient profile in any slope direction searched during scanning.

    rmrs-publisher - October 07, 2011

  7. Trends in standing biomass in Interior West forests: Reassessing baseline data from periodic inventories

    Trends in U.S. forest biomass and carbon are assessed using Forest Inventory and Analysis (FIA) data relative to baseline assessments from the 1990s. The integrity of baseline data varies by state and depends largely on the comparability of periodic versus annual forest inventory data. In most states in the Interior West FIA region, the periodic inventory's sample design, plot configuration, estimation procedures, and definitions were different from those for the annual inventory, which are nationally consistent.

    rmrs-publisher - September 17, 2013

  8. Assessing soil erosion on trails: A comparison of techniques

    Reports of trail degradation have been increasing in different wildernesses. This impact has become a common concern among managers. Deteriorating tread conditions of trails are increasing, as is concern at protected areas worldwide. In order to make objective and timely trail resource decisions, managers need to have effective and efficient methods of assessing trail erosion. Various approaches to assessing trail erosion, the limitations and utility of each and implications for management are discussed.

    rmrs-publisher - February 24, 2006

  9. Bucklands Crossing firefighter burnover-a case study of fire behaviour and firefighter safety implications

    On March 24, 1998, a crew of eight rural firefighters were burned over while attempting to suppress a backburning sector of the Bucklands Crossing Fire in North Otago, New Zealand. The fire demonstrates how factors typical of the New Zealand fire environment – steep slopes, highly flammable shrub fuels, and a strong foehn wind effect – combined to produce extreme fire behaviour. Several firefighters sustained varying degrees of injury. They were hit by a blowup that was most likely caused by a rapid reburn through previously underburned shrub fuels.

    rmrs-publisher - September 18, 2007

  10. Evidence of biased processing of natural resource-related information: A study of attitudes toward drilling for oil in the Arctic National Wildlife Refuge

    The purpose of this study was to determine the extent to which individuals process natural resource-related information in a biased manner. Data were gathered using surveys administered to students enrolled in undergraduate classes at Colorado State University. Students' attitudes toward Arctic drilling were evaluated both before and after they were exposed to exaggerated information about both sides of the issue. Consistent with initial expectations, respondents' attitudes did not change as a result of exposure to new information.

    rmrs-publisher - September 04, 2007