Treesearch
Displaying 6,161 - 6,170 of 65,164 Publications- Arctomecon humilis (dwarf bear poppy) is an endangered gypsophile restricted to the St. George area in southern Utah, USA. Extirpation of the rare oligolectic bee Perdita meconis and decline of other native pollinators within the last 20 years has been largely attributed to the advent of invasive Africanized honeybees (AHBs), which have become the predominant pollinator for A. humilis. A three-year study was carried out to determine if reliance on AHBs had a negative effect on reproductive output. In the first year, pollen addition experiments were carried out in a small, isolated populatio...AuthorsAlyson M. DeNittis, Susan E. MeyerSourceDiversity. 14: 1.Year2022
- 1. Individual tree detection (ITD) and crown delineation are two of the most relevant methods for extracting detailed and reliable forest information from LiDAR (Light Detection and Ranging) datasets. However, advanced computational skills and specialized knowledge have been normally required to extract forest information from LiDAR.2. The development of accessible tools for 3D forest characterization can facilitate rapid assessment by stakeholders lacking a remote sensing background, thus fostering the practical use of LiDAR datasets in forest ecology and conservation. This paper introduce...AuthorsCarlos Alberto Silva, Andrew T. Hudak, Lee A. Vierling, Ruben Valbuena, Adrian Cardil, Midhun Mohan, Danilo Roberti Alves de Almeida, Eben N. Broadbent, Angelica M. Almeyda Zambrano, Ben Wilkinson, Ajay Sharma, Jason B. Drake, Paul B. Medley, Jason G. Vogel, Gabriel Atticciati Prata, Jeff W. Atkins, Caio Hamamura, Daniel J. Jonson, Carine KlaubergSourceMethods in Ecology and Evolution. 13: 1164-1176.Year2022
- NASA’s Global Ecosystem Dynamics Investigation (GEDI) is collecting spaceborne full waveform lidar data with a primary science goal of producing accurate estimates of forest aboveground biomass density (AGBD). This paper presents the development of the models used to create GEDI’s footprint-level (~25 m) AGBD (GEDI04_A) product, including a description of the datasets used and the procedure for final model selection. The data used to fit our models are from a compilation of globally distributed spatially and temporally coincident field and airborne lidar datasets, whereby we simulated...AuthorsLaura Duncanson, James R. Kellner, John Armston, Ralph Dubayah, David M. Minor, Steven Hancock, Sean P. Healey, Paul L. Patterson, Svetlana Saarela, Suzanne Marselis, Carlos E. Silva, Jamis Bruening, Scott J. Goetz, Hao Tang, Michelle Hofton, Bryan Blair, Scott Luthcke, Lola Fatoyinbo, Katharine Abernethy, Alfonso Alonso, Hans-Erik Andersen, Paul Aplin, Timothy R. Baker, Nicolas Barbier, Jean Francois Bastin, Peter Biber, Pascal Boeckx, Jan Bogaert, Luigi Boschetti, Peter Brehm Boucher, Doreen S. Boyd, David F. R. P. Burslem, Sofia Calvo-Rodriguez, Jerome Chave, Robin L. Chazdon, David B. Clark, Deborah A. Clark, Warren B. Cohen, David A. Coomes, Piermaria Corona, K. C. Cushman, Mark E. J. Cutler, James W. Dalling, Michele Dalponte, Jonathan Dash, Sergio de-Miguel, Songqiu Deng, Peter Woods Ellis, Barend Erasmus, Patrick A. Fekety, Alfredo Fernandez-Landa, Antonio Ferraz, Rico Fischer, Adrian G. Fisher, Antonio Garcia-Abril, Terje Gobakken, Jorg M. Hacker, Marco Heurich, Ross A. Hill, Chris Hopkinson, Huabing Huang, Stephen P. Hubbell, Andrew T. HudakSourceRemote Sensing of Environment. 270: 112845.Year2022
- Armillaria root disease causes tree stress and mortality worldwide, including in conifer forests of western North America. Armillaria-induced tree mortality is slower than other disturbances, such as fire, but persistent over time, and therefore difficult to detect across large areas. Hence methods to detect Armillaria-affected trees and identify infested stands are of great value to forest managers. We used high-density light detection and ranging (lidar), high-resolution aerial orthoimagery, and associated field observations to map individual tree health across an Armillaria-affected...AuthorsBrent W. Oblinger, Benjamin C. Bright, Ryan Hanavan, Mike Simpson, Andrew T. Hudak, Bruce D. Cook, Lawrence A. CorpKeywordsSourceForest Ecology and Management. 511: 120126.Year2022
- Soil erosion has been recognized as a significant environmental issue in the United States for over 200 years. Numerous attempts have been made to predict and quantify the phenomenon, yet significant issues remain that hinder the accuracy and effectiveness of such models. This article describes the application of the new generation Unit Stream Power Erosion and Deposition (USPED) model that estimates soil erosion and concomitant sediment deposition at Schofield Barracks, Hawai‘i, an active Army training installation. The model accurately placed modeled estimates of soil erosion and...AuthorsSteve D. Warren, Thomas L. RuzyckiSourcePacific Science. 76(1): 43-51.Year2022
- Public lands face growing demands to provide ecosystem services, while protecting species of conservation concern, like insect pollinators. Insect pollinators are critical for the maintenance of biodiversity and ecosystem function, but it is unclear how management of public lands influence pollinator conservation. We found 63 studies investigating the effects of prescribed burning, logging, grazing, invasive species removal, revegetation with wildflower mixes, and hosting commercial pollinators, on native insect pollinators on natural and semi-natural ecosystems in the US and summarized...AuthorsWill Glenny, Justin B. Runyon, Laura A. BurkleKeywordsSourceBiodiversity and Conservation. https://doi.org/10.1007/s10531-022-02399-5.Year2022
- Demasculinization, the reduction of male sexual characters due to parasitic nematode infection, is described in Nearctic Dolichopodidae. Five species are confirmed to be demasculinized (3 species of Dolichopus Latreille and 1 species each of Rhaphium Meigen and Tachytrechus Haliday) by nematodes in two families (apparent Mermithidae and Parasitylenchidae). The following nematode-infected males were inadvertently described as new species and are here proposed as synonyms: Dolichopus hurleyi Runyon, 2008 = D. dorycerus Loew, 1864, syn. nov.; Dolichopus frosti Runyon, 2008 = D. sincerus...AuthorsJustin B. RunyonKeywordsSourceZootaxa. 5092(5): 545-558.Year2022
- Spatial interactions between trees influence forest community succession. The objective of this study was to investigate how shifts in forest composition and proximity between tree species affect stand development over time in mixed forest systems. At six locations across the Fishlake National Forest, Utah, USA, in stands where facilitation has been documented previously, tree-ring samples were collected from aspen and subalpine fir trees. Basal area increment was calculated to characterize the effects of the proximity of overstory trees on multidecadal growth responses of aspen and...AuthorsRebecca Lee Molinari, Matthew F. Bekker, Benjamin D. St. Clair, Jason Bartholomew, R. Justin DeRose, Stanley G. Kitchen, Samuel B. St. ClairKeywordsSourceEcosphere. 13: e3957.Year2022
- We derive a nested risk measure for a maximization problem and implement it in a scenario-based for- mulation of a multi-stage stochastic mixed-integer programming problem. We apply the risk-averse for- mulation to the surveillance and control of a non-native forest insect, the emerald ash borer (EAB), a wood-boring beetle native to Asia and recently discovered in North America. Spreading across the east- ern United States and Canada, EAB has killed millions of ash trees and cost homeowners and local gov- ernments billions of dollars. We present a mean-Conditional Value-at-Risk (CVaR),...AuthorsSabah Bushaj, İ Esra Büyüktahtakın, Robert G. HaightKeywordsSourceEuropean Journal of Operational ResearchYear2022
- Oak wilt caused by Bretziella fagacearum is an important disease of Quercus spp.; however, its diagnosis may be confused with damage resulting from other diseases, insects, or abiotic factors. Laboratory diagnosis is important in such situations and when disease control action is desired. PCR tests can provide accurate lab diagnosis within 2 days. Two variations of a simple DNA extraction protocol using sodium hydroxide (NaOH) were compared with that of the proprietary protocol of a commercially available kit (CK) for nested PCR to detect the pathogen in oak sapwood. High frequencies of...AuthorsMelanie J. Moore, Jennifer Juzwik, Olga Saiapina, Snober Ahmed, Anna Yang, Abdennour AbbasKeywordsSourcePlant Health ProgressYear2022