Treesearch
Displaying 7,171 - 7,180 of 65,176 Publications- “Megafires” are of scientific interest and concern for fire management, public safety planning, and smoke-related public health management. There is a need to predict them on time scales from days to decades. Understanding is limited, however, of the role of daily weather in determining their extreme size. This study examines differences in the daily weather during these and other smaller fires, and in the two sets of fires’ responses to daily weather and antecedent atmospheric dryness. Twenty fires of unusual size (over 36 400 ha), were each paired with a nearby large fire (10 100–30 300...AuthorsBrian Potter, Daniel McEvoyKeywordsSourceEarth Interactions. 25(1): 160-176.Year2021
- A two‐phase Bayesian model is presented for updating risk assessments for locations susceptible to infection by exotic pathogens. Human transportation from previously infected regions to uninfected regions is the main dispersal mechanism. Information embedded in patterns within the transportation flow are exploited in the update process. We explore the sensitivity of the model's outputs to changes in inputs. A sample application of the model to sudden oak death, using fictitious infection data, is performed.AuthorsSteven C. McKelvey, Frank H. H. Koch, William D. Smith, Kelly R. HawleyKeywordsSourceNatural Resource ModelingYear2021
- 2020 is the year of wildfire records. California experienced its three largest fires early in its fire season. The Pantanal, the largest wetland on the planet, burned over 20% of its surface. More than 18 million hectares of forest and bushland burned during the 2019– 2020 fire season in Australia, killing 33 people, destroying nearly 2500 homes, and endangering many endemic species. The direct cost of damages is being counted in dozens of billion dollars, but the indirect costs on water-related ecosystem services and benefits could be equally expensive, with impacts lasting for decades....AuthorsFrançois‐Nicolas Robinne, Dennis Hallema, Kevin D. Bladon, Mike D. Flannigan, Gabrielle Boisramé, Christian M. Bréthaut, Stefan H. Doerr, Giuliano Di Baldassarre, Louise A. Gallagher, Amanda K. Hohner, Stuart J. Khan, Alicia M. Kinoshita, Rua Mordecai, João Pedro Nunes, Petter Nyman, Cristina Santín, Gary Sheridan, Cathelijne R. Stoof, Matthew P. Thompson, James M. Waddington, Yu WeiKeywordsSourceHydrological ProcessesYear2021
- International agreements such as the Convention on Biological Diversity (CBD) have committed to conserve, and sustainably and equitably use, biodiversity. The CBD is a vital instrument for global conservation because it guides 195 countries and the European Union in setting priorities and allocating resources, and requires regular reporting on progress. However, the CBD and similar policy agreements have often neglected genetic diversity.This is a critical gap because genetic diversity underlies adaptation to environmental change and ecosystem resilience. Here we aim to inform future...AuthorsSean Hoban, Catriona D. Campbell, Jessica M. da Silva, Robert Ekblom, W. Chris Funk, Brittany A. Garner, José A. Godoy, Francine Kershaw, Anna J. MacDonald, Joachim Mergeay, Melissa Minter, David O'Brien, Ivan Paz Vinas, Sarah K. Pearson, Sílvia Pérez-Espona, Kevin M. Potter, Isa-Rita M. Russo, Gernot Segelbacher, Cristiano Vernesi, Margaret E. HunterKeywordsSourceBiological ConservationYear2021
Balancing Large-Scale Wildlife Protection and Forest Management Goals with a Game-Theoretic Approach
When adopted, wildlife protection policies in Canadian forests typically cover large areas and affect multiple economic agents working in these landscapes. Such measures are likely to increase the costs of timber for forestry companies operating in the area, which may hinder their acceptance of the policies unless harvesting remains profitable. We propose a bi-level wildlife protection problem that accounts for the profit-maximizing behavior of forestry companies operating in an area subject to protection. We consider the regulator with a wildlife protection mandate and forestry companies...AuthorsDenys Yemshanov, Robert G. Haight, Ning Liu, Robert S. Rempel, Frank H. H. Koch, Art RodgersKeywordsSourceForestsYear2021- Human activities and global change have resulted in more severe and destructive megafires in forest ecosystems worldwide. Here, I introduce and discuss the concept of “management mosaics” and how to use it over both space and time to mitigate the growing impacts of extreme wildfires.AuthorsQinfeng GuoKeywordsSourceEcological ProcessesYear2021
- Climate change is expected to alter the distribution and abundance of tree species, impacting ecosystem structure and function. Yet, anticipating where this will occur is often hampered by a lack of understanding of how demographic rates, most notably recruitment, vary in response to climate and competition across a species range. Using large-scale monitoring data on two dry woodland tree species (Pinus edulis and Juniperus osteosperma), we develop an approach to infer recruitment, survival, and growth of both species across their range. In doing so, we account for ecological and statistica...AuthorsRobert K. Shriver, Charles B. Yackulic, David M. Bell, John B. BradfordKeywordsSourceEcology. 102(8):e03425.Year2021
- Microclimatic refugia (microrefugia) are ecologically important for the conservation of biodiversity under climate change. Year-to-year climatic consistency is an important requirement for most types of microrefugia, but refugia are often modeled using only a few years of data. Here, we used a decade-long (2009-2018) finescale, undercanopy microclimate temperature dataset from a landscape in the Cascades Mountains of Oregon, USA to assess the inter-annual temporal consistency of microrefugia. We used boosted regression tree microclimate models to quantify overall consistency and map...AuthorsChristopher Wolf, David M. Bell, Hankyu Kim, Michael Paul Nelson, Mark Schulze, Matthew G. BettsKeywordsSourceAgricultural and Forest Meteorology. 307: 108520.Year2021
- Despite its importance for forest regeneration, food webs, and human economies, changes in tree fecundity with tree size and age remain largely unknown. The allometric increase with tree diameter assumed in ecological models would substantially overestimate seed contributions from large trees if fecundity eventually declines with size. Current estimates are dominated by overrepresentation of small trees in regression models. We combined global fecundity data, including a substantial representation of large trees. We compared size–fecundity relationships against traditional allometric...AuthorsTong Qiu, Marie-Claire Aravena, Robert Andrus, Davide Ascoli, Yves Bergeron, Roberta Berretti, Michal Bogdziewicz, Thomas Boivin, Raul Bonal, Thomas Caignard, Rafael Calama, J. Julio Camarero, Connie Clark, Benoit Courbaud, Sylvain Delzon, Sergio Calderon, William Farfan-Rios, Catherine Gehring, Gregory Gilbert, Katie H. Greenberg, Qinfeng Guo, Janneke Hille Ris Lambers, Kazuhiko Hoshizaki, Ines Ibanez, Valentin Journe, Christopher Kilner, Richard Kobe, Walter Koenig, Georges Kunstler, Jalene LaMontagne, Mateusz Ledwon, James Lutz, Renzo Motta, Jonathan Myers, Thomas Nagel, Chase Nunez, Ian Pearse, Lukasz Piechnik, John Poulsen, Renata Poulton-Kamakura, Miranda Redmond, Chantal Reid, Kyle Rodman, C, Lane Scher, Harald Schmidt Van Marle, Barbara Seget, Shubhi Sharma, Miles Silman, Jennifer Swenson, Margaret Swift, Maria Uriarte, Giorgio Vacchiano, Thomas Veblen, Amy Whipple, Thomas Whitham, Andreas Wion, S. Joseph Wright, Kai Zhu, Jess Zimmerman, Magdalena Zywiec, James ClarkSourceProceedings of the National Academy of SciencesYear2021
- The Northwest Forest Plan (NWFP) is an ecosystem management plan for federal lands in the U.S. Pacific Northwest. To evaluate the NWFP’s effectiveness at conserving the marbled murrelet (Brachyramphus marmoratus), we estimated murrelet abundance at sea annually from 2000 to 2018 in inshore marine waters associated with the NWFP area. We divided this area of coastal waters into five geographic subareas corresponding with conservation zones established in the U.S. Fish and Wildlife Service’s recovery plan for the marbled murrelet. We used line transect distance estimation methods to account...AuthorsWilliam R. McIver, Scott F. Pearson, Craig Strong, Monique M. Lance, Jim Baldwin, Deanna Lynch, Martin G. Raphael, Richard D. Young, Nels G. JohnsonKeywordsSourceGen. Tech. Rep. PNW-GTR-996. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 37 p.Year2021