Treesearch
Displaying 17,371 - 17,380 of 64,641 Publications- Fruits produce a wide range of volatile organic compounds that impart their characteristically distinct aromas and contribute to unique flavor characteristics. Fruit aroma and flavor characteristics are of key importance in determining consumer acceptance in commercial fruit markets based on individual preference. Fruit producers, suppliers and retailers traditionally utilize and rely on human testers or panels to evaluate fruit quality and aroma characters for assessing fruit salability in fresh markets. We explore the current and potential utilization of electronic-nose devices (with...AuthorsManuela Baietto, Dan D. WilsonSourceSensors 15:899-931Year2015
- Conservation of species requires accurate population estimates. We used genetic markers from feces to determine bighorn sheep abundance for a herd that was hypothesized to be declining and in need of population status monitoring. We sampled from a small but accessible portion of the population’s range where animals naturally congregate at a natural mineral lick to test whether we could accurately estimate population size by sampling from an area where animals concentrate. We used mark-recapture analysis to derive population estimates, and compared estimates from this smaller spatial...AuthorsKathryn A. Schoenecker, Mary Kay Watry, Laura E. Ellison, Michael K. Schwartz, Gordon L. LuikartKeywordsSourceWestern North American Naturalist. 75(2): 181-191.Year2015
- The global loss of biodiversity continues at an alarming rate. Genomic approaches have been suggested as a promising tool for conservation practice as scaling up to genome-wide data can improve traditional conservation genetic inferences and provide qualitatively novel insights. However, the generation of genomic data and subsequent analyses and interpretations remain challenging and largely confined to academic research in ecology and evolution. This generates a gap between basic research and applicable solutions for conservation managers faced with multifaceted problems. Before the...AuthorsAaron B. A. Shafer, Jochen B. W. Wolf, Paulo C. Alves, Linnea Bergstrom, Michael W. Bruford, Ioana Brannstrom, Guy Colling, Love Dalen, Luc De Meester, Robert Ekblom, Katie D. Fawcett, Simone Fior, Mehrdad Hajibabaei, Jason A. Hill, A. Rus Hoezel, Jacob Hoglund, Evelyn L. Jensen, Johannes Krause, Torsten N. Kristensen, Michael Krutzen, John K. McKay, Anita J. Norman, Rob Ogden, E. Martin Osterling, N. Joop Ouborg, John Piccolo, Danijela Popovic, Craig R. Primmer, Floyd A. Reed, Marie Roumet, Jordi Salmona, Tamara Schenekar, Michael K. Schwartz, Gernot Segelbacher, Helen Senn, Jens Thaulow, Mia Valtonen, Andrew Veale, Philippine Vergeer, Nagarjun Vijay, Carles Vila, Matthias Weissensteiner, Lovisa Wennerstrom, Christopher W. Wheat, Piotr ZielinskiKeywordsSourceTrends and Ecology in Evolution. 30(2): 78-87.Year2015
- Biomass ash is an important and potentially useful by-product of the bioenergy industry. As a "proof of concept" for using biomass fly ash as a foliar fertilizer, we tested (i) whether the nutrients in the ash were absorbed by hybrid aspen trees, (ii) whether the ash affected tree growth, and (iii) whether the ash was compatible with nitrogen foliar fertilizer. Four foliar treatments (water [control], ash suspended in water, nitrogen fertilizer solution, and ash suspended in nitrogen fertilizer solution) were evaluated. Several nutrients in the fly ash were absorbed by hybrid aspen both in...AuthorsWilliam Headlee, Richard HallKeywordsSourceJournal of Plant Nutrition. 38: 647-662.Year2015
- The Forest Service Tree Climbing Program provides direction that protects Forest Service employees while ascending, descending, and working aloft in trees by establishing national direction based on recognized industry standards, procedures and practices. Climbing and working in trees demands specialized equipment and skills. The potential for a serious injury or fatal fall is always present, so employees shall be trained and certified before they engage in tree climbing operations and activities. The Forest Service Silvicultural Practices Handbook, FSH 2409.17, Chapter 50-Forest Tree...AuthorsJerry Berdeen, Burnham Chamberlain, Teryl G. Grubb, Art Henderson, Brock Mayo, Manfred Mielke, Kathryn L. Purcell, Dennis Ringnes, Marc Roberts, Donna Stubbs, Micah ThorningSourceTech. Rep. 0567-2819-MTDC. Missoula, MT: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center. 88 p.Year2015
- Nearest neighbors techniques calculate predictions as linear combinations of observations for a selected number of population units in a sample that aremost similar, or nearest, in a space of auxiliary variables to the population unit requiring the prediction. Nearest neighbors techniques have been shown to be particularly effective when used with forest inventory and remotely sensed data. Recent attention has focused on developing an underlying foundation consisting of diagnostic tools, inferential extensions, and techniques for optimization. For a study area in Norway, forest inventory...AuthorsRonald E. McRoberts, Erik Næsset, Terje GobakkenKeywordsSourceRemote Sensing of EnvironmentYear2015
- Remote sensing-based change estimation typically takes two forms. Indirect estimation entails constructing models of the relationship between the response variable of interest and remotely sensed auxiliary variables at two times and then estimating change as the differences in the model predictions for the two times. Direct estimation entails constructing models of change directly using observations of change in the response and the remotely sensed auxiliary variables for two dates. The direct method is generally preferred, although few statistically rigorous comparisons have been reported....AuthorsRonald E. McRoberts, Erik Naesset, Terje Gobakken, Ole-Martin BollandsasKeywordsSourceRemote Sensing of Environment. 164: 36-42.Year2015
- Significant conversion of forestland to nonforest use is of fundamental concern to the forestry profession. The world's forests are estimated to have occupied 14 billion acres in 1700, about 44% of the world's land area (Ramankutty and Foley 1999) and by 1990 forests occupied 10.3 billion acres of land (Food and Agriculture Organization of the United Nations [FAO] 2010). From 1990 to 2010, about 16.6 million acres per year, an area larger than the State of West Virginia, were converted to nonforest use (FAO 2010). The extent of degradation in the tropics is less well documented but still...AuthorsPatricia Elias, Linda S. HeathSourceJournal of Forestry 113(2): 268-270.Year2015
- Tree species distribution and abundance are affected by forces operating across a hierarchy of ecological scales. Process and species distribution models have been developed emphasizing forces at different scales. Understanding model agreement across hierarchical scales provides perspective on prediction uncertainty and ultimately enables policy makers and managers to make better decisions. Our objective was to test the hypothesis that agreement between process and species distribution models varies by hierarchical level. Due to the top-down approach of species distribution models and the...AuthorsJeffrey E. Schneiderman, Hong S. He, Frank R. Thompson, William D. Dijak, Jacob S. FraserKeywordsSourceLandscape EcologyYear2015
- A spatial mismatch exists between regional climate models and conditions experienced by individual organisms. We demonstrate an approach to downscaling air temperatures for site-level studies using airborne LiDAR data and remote microclimate loggers. In 2012-2013, we established a temperature logger network in the forested region of central Missouri, USA, and obtained sub-hourly meteorological measurements from a centrally located weather station. We then used linear mixed models within an information theoretic approach to evaluate hourly and seasonal effects of insolation, vegetation...AuthorsAndrew D. George, Frank R. Thompson, John FaaborgSourceRemote Sensing Letters. 6(12): 924-932.Year2015