Treesearch
Displaying 4,291 - 4,300 of 65,126 Publications- The actions urban forest managers, ecologists, and community stewards undertake to review and comment on new development plans and to plant, remove, and otherwise manage trees in cities have implications for local wildlife habitat and biodiversity. Far too often, these influences do not receive enough attention unless threatened and endangered species are present, or if residents make it an issue. This article puts a spotlight on the impacts of urbanization on ecological communities and biodiversity, and how urban and community plans, policies, and actions can make a difference in improving...AuthorsAlexandreana Cocroft, Susannah B. Lerman, Patricia N. Klein, Phillip RodbellSourceCityTREES. 60: 24-28.Year2023
- Disturbances to forested watersheds often result in increases of nutrients and light to nearby streams. Such changes are generally expected to produce a shift to a more autotrophic aquatic ecosystem, with measurable increases in algae, and associated implications for food webs and fisheries. Although this paradigm is widely established, results from our 10-year study (2007–2016) in 12 headwater streams and four sites downstream in the Trask River Watershed (Oregon, USA), did not concur. In 2012, one watershed was thinned, three were clearcut harvested with variable buffers and three with...AuthorsSherri Johnson, Alba Argerich, Linda R. Ashkenas, Rebecca J. Bixby, David C. PlaehnKeywordsSourcePLOS ONE. 18(4): e0284590.Year2023
- With climate change and ongoing impacts from human development and resource extraction, US federal land management agencies are acutely concerned with managing for healthy aquatic ecosystems in the Southern Appalachian Mountain (SAM) Region. Here, we describe development of a spatial decision support application to assess the biological and ecological impacts of atmospheric S and N deposition on aquatic ecosystems of the region. We first summarize foundational published work to predict continuous maps of surface water acid neutralizing capacity (ANC) and soil base cation weathering (BCw)....AuthorsKeith M. Reynolds, Paul F. Hessburg, Milena Lakicevic, Nicholas Povak, Brion Salter, Timothy J. Sullivan, Todd C. McDonnell, Bernard J. Cosby, William JacksonKeywordsSourceEcosphere. 14(5): e4507.Year2023
- Statistical confidence in estimates of timber volume, carbon storage, and other forest attributes depends, in part, on the uncertainty in field measurements. Surprisingly, measurement uncertainty is rarely reported, even though national forest inventories routinely repeat field measurements for quality assurance. We compared measurements made by field crews and quality assurance crews in the Forest Inventory and Analysis program of the U.S. Forest Service, using data from 2790 plots and 51 740 trees and saplings across the 24 states of the Northern Region.We characterized uncertainty in 12...AuthorsRuth D. Yanai, Alexander R. Young, John Campbell, James A. Westfall, Charles Barnett, Gretchen A. Dillon, Mark B. Green, Christopher W. W. WoodallKeywordsSourceCanadian Journal of Forest ResearchYear2023
- In October 2011, the Halloween Nor'easter produced unusually early and heavy snowfall while leaves were still on the trees, causing extensive damage throughout the northeastern United States. This storm is an example of winter weather whiplash, in which an abrupt, back-and-forth swing in winter weather affects coupled human and natural systems. Research on the social-ecological drivers and impacts of winter weather whiplash is scarce because most studies only consider meteorological causes and consequences of extreme events. In this study, we used publicly available data of snowfall...AuthorsIrena Creed, Christopher Hewitt, Nora Casson, Alexandra Contosta, John Campbell, David Lutz, Anita MorzilloKeywordsSourceEcology and SocietyYear2023
- Dry conifer forests in the western US historically experienced frequent fire prior to European American colonization. Mean fire return interval ranged from about 5-35 years, with the majority of fires burning at low-to-moderate severity. The arrival of European Americans initiated notable reductions in fire frequency through the cessation of Indigenous burning, livestock grazing, and fire suppression. These activities effectively excluded fire from most dry conifer forests, thereby allowing live and dead fuels to accumulate. There are concerns that this fuel accumulation is causing...AuthorsSean A. Parks, Lisa M. Holsinger, Kori Blankenship, Greg Dillon, Sara A. Goeking, Randy SwatyKeywordsSourceForest Ecology and Management. 544: 121232.Year2023
- This is the executive summary for the report, Climate Change Vulnerability and Adaptation in the Columbia River Gorge National Scenic Area, Mount Hood National Forest, and Willamette National Forest, by Halofsky et al. (2022, PNW-GTR-1001). The vulnerability and adaptation assessment was conducted by a science-management partnership comprising of the three U.S. Department of Agriculture Forest Service units, Forest Service scientists, and other organizations. The partnership assessed the vulnerability of natural resources to climate change and developed adaptation options that minimize...AuthorsRobert Hoyer, Thomas TimberlakeKeywordsSourceClimate change vulnerability and adaptation in the Columbia River Gorge National Scenic Area, Mount Hood National Forest, and Willamette National Forest: executive summary. Misc. Pub. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 11 p.Year2023
- Fungal pathogens of the genus Ceratocystisrecently introduced to the Island of Hawaiʻi have killed hundreds of thousands of native ‘Ōhiʻa trees, an ecologically and culturally important keystone species. Symptoms of the associated disease, Rapid ‘Ōhiʻa Death (ROD), have been found to be easily detectable with high resolution imaging spectroscopy. We used wall-to-wall maps of affected ‘Ōhiʻa canopy built in four consecutive years (2016–2019) to analyze how changes in the distribution and density of browning canopy detections over this time period corresponded to environmental drivers at two...AuthorsNicholas R. Vaughn, Flint F. Hughes, Gregory P. AsnerKeywordsSourceForest Ecology and Management. 538: 120983Year2023
- For many forest landscape ecology and ecological monitoring projects, forest structure and composition data availability at the correct scale are often limiting factors, motivating the development of map products based on remote sensing. Gradient nearest neighbor (GNN) imputation is a flexible framework for generating multivariate, annual, wall-to-wall maps of forest structure and composition for landscape, regional, and national applications. This report provides guidance on the appropriate use of forest structure and composition maps generated from satellite imagery, physical environment,...AuthorsDavid M. Bell, Matthew J. Gregory, Marin Palmer, Raymond DavisKeywordsSourceGen. Tech. Rep. PNW-GTR-1018. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 41 p. (Online only).Year2023
- The benefits of masting (volatile, quasi-synchronous seed production at lagged intervals) include satiation of seed predators, but these benefits come with a cost to mutualist pollen and seed dispersers. If the evolution of masting represents a balance between these benefits and costs, we expect mast avoidance in species that are heavily reliant on mutualist dispersers. These effects play out in the context of variable climate and site fertility among species that vary widely in nutrient demand. Meta-analyses of published data have focused on variation at the population scale, thus...AuthorsAmy V Whipple, Thomas G. Whitham, Andreas P. Wion, S. Joseph Wright, Kai Zhu, Jess K. Zimmerman, Magdalena Zywiec, James S. Clark, Tong Qiu, Marie-Claire Aravena, Davide Ascoli, Yves Bergeron, Michal Bogdziewicz, Thomas Boivin, Raul Bonal, Thomas Caignard, Maxime Cailleret, Rafael Calama, Sergio Donoso Calderon, J. Julio Camarero, Chia-Hao Chang-Yang, Jerome Chave, Francesco Chianucci, Benoit Courbaud, Andrea Cutini, Adrian J. Das, Nicolas Delpierre, Sylvain Delzon, Michael Dietze, Laurent Dormont, Josep Maria Espelta, Timothy J. Fahey, William Farfan-Rios, Jerry F. Franklin, Catherine A. Gehring, Gregory S. Gilbert, Georg Gratzer, Cathryn H. Greenberg, Arthur Guignabert, Qinfeng Guo, Andrew Hacket-Pain, Arndt Hampe, Qingmin Han, Jan Holik, Kazuhiko Hoshizaki, Ines Ibanez, Jill F. Johnstone, Valentin Journé, Thomas Kitzberger, Johannes M. H. Knops, Georges Kunstler, Hiroko Kurokawa, Jonathan G. A. Lageard, Jalene M. LaMontagne, Francois Lefevre, Theodor Leininger, Jean-Marc Limousin, James A. Lutz, Diana Macias, Anders Marell, Eliot J. B. McIntire, Christopher M. Moore, Emily Moran, Renzo Motta, Jonathan A. Myers, Thomas A. Nagel, Shoji Naoe, Mahoko Noguchi, Michio Oguro, Robert Parmenter, Ian S. Pearse, Ignacio M. Perez-Ramos, Lukasz Piechnik, Tomasz Podgorski, John Poulsen, Miranda D. Redmond, Chantal D. Reid, Kyle C. Rodman, Francisco Rodriguez-Sanchez, Pavel Samonil, Javier D. Sanguinetti, C. Lane Scher, Barbara Seget, Shubhi Sharma, Mitsue Shibata, Miles Silman, Michael A. Steele, Nathan L. Stephenson, Jacob N. Straub, Samantha Sutton, Jennifer J. Swenson, Margaret Swift, Peter A. Thomas, Maria Uriarte, Giorgio VacchianoKeywordsSourceNature PlantsYear2023