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Displaying 6,651 - 6,660 of 64,641 PublicationsBalancing 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
- North American forests are threatened by changes in climate and disturbance dynamics. Current efforts to model future vegetation and fire dynamics are challenged by the lack of mechanistic representation of ecological processes, the spatial resolution to capture landscape-level heterogeneity, and the ability to model regional spatial extents. To address these gaps, a dynamic vegetation model was adapted for regional applications to the western forests of the U.S. Here we present LPJ-GUESS-LMfireCF, a dynamic vegetation model that includes the ecological processes of a dynamic global...AuthorsKristen D. Emmett, Katherine Renwick, Benjamin PoulterKeywordsSourceEcological ModellingYear2021
- Plant diversity, habitat properties, and their relationships in karst caves remain poorly understood. We surveyed vascular plant and bryophyte diversities and measured the habitat characteristics in six karst caves in south China with different disturbance histories (one had been disturbed by poultry feeding, three had been disturbed by tourism, and two were undisturbed). The plant diversity differences among the six caves were analyzed using cluster analysis, and the relationships of plant diversity and microhabitat were assessed using canonical correspondence analysis. We found a total...AuthorsH Ren, F Wang, W Ye, Q Zhang, T Han, Y Huang, G Chu, D Hui, Qinfeng GuoSourceEcological IndicatorsYear2021
- Invasive plants and native weeds (i.e., undesirable plant species) often have negative effects on native ecosystems. However, the effects of weed expansion on soil seed banks and seedling emergence in native forests have not been well investigated. In this study, we used a seedling emergence assay to assess the effects of expansion by a native weed, the perennial C4 herb Wollastonia biflora, on the soil seed bank and above-ground vegetation in forests on Yongxing Island, a coral island in the South China Sea. We found that W. biflora expansion was associated with a reduced abundance of...AuthorsYao Huang, Hai Ren, Jun Wang, Nan Liu, Shuguang Jian, Hongyue Cai, Dafeng Hui, Qinfeng GuoSourceGlobal Ecology and ConservationYear2021
- With evidence of pollinator declines and an increasing focus on restoration, interest is growing in investigating floral resources for native bees. Although native bees forage on shrubs, few studies have explored the pollinator communities of native shrubs and none have examined shrub-pollinator interactions in riparian areas of the northwestern United States. Life history traits of shrubs may make them particularly important resources for bees, especially in early spring—a key point in the lifecycle of many bee species. We conducted extensive hand-net surveys over 2 years in a large...AuthorsScott R. Mitchell, Sandra J. DeBano, Mary M. Rowland, Skyler BurrowsKeywordsSourceRestoration Ecology. 36: 478-490.Year2021