Treesearch
Search National Treesearch
Displaying 231 - 240 of 12,497 Publications
- Local adaptation may facilitate range expansion during invasions, but the mechanisms underlying successful invasions remain unclear. Cheatgrass (Bromus tectorum), native to Eurasia and Africa, has invaded globally, with severe impacts in western North America. We aim to identify mechanisms and consequences of local adaptation in the North American cheatgrass invasion. We sequence 307 range-wide genotypes and conduct controlled experiments. We find that diverse lineages invaded North America, where long-distance gene flow is common. Nearly half of North American cheatgrass comprises a...AuthorsDiana Gamba, Megan L. Vahsen, Toby M. Maxwell, Nikki Pirtel, Seth Romero, Justin J. Van Ee, Amanda Penn, Aayudh Das, Rotem Ben-Zeev, Owen Baughman, C. Sean Blaney, Randy Bodkins, Shanta Budha-Magar, Stella M. Copeland, Shannon L. Davis-Foust, Alvin Diamond, Ryan C. Donnelly, Peter W. Dunwiddie, David J. Ensing, Thomas A. Everest, Holly Hoitink, Martin C. Holdrege, Ruth A. Hufbauer, Sigitas Juzėnas, Jesse M. Kalwij, Ekaterina Kashirina, Sangtae Kim, Marcin Klisz, Alina Klyueva, Michel Langeveld, Samuel Lutfy, Daniel Martin, Christopher L. Merkord, John W. Morgan, Dávid U. Nagy, Jacqueline P. Ott, Radoslaw Puchalka, Lysandra A. Pyle, Leonid Rasran, Brian G. Rector, Christoph Rosche, Marina Sadykova, Robert K. Shriver, Alexandr Stanislavschi, Brian M. Starzomski, Rachel L. Stone, Kathryn G. Turner, Alexandra K. Urza, Acer VanWallendael, Carl-Adam Wegenschimmel, Justin Zweck, Cynthia S. Brown, Elizabeth A. Leger, Dana M. Blumenthal, Matthew J. Germino, Lauren M. Porensky, Mevin B. Hooten, Peter B. Adler, Jesse R. LaskyKeywordsSourceNature CommunicationsYear2025
- Temporal changes in the hydrologic and mechanical behavior of burned slopes result in changes in post-wildfire slope stability. The lack of long-term monitoring data on landscape recovery hinders our understanding of the interdependencies between wildfire-induced alterations in soil and vegetation properties, near-surface processes, and landslides. This study presents results from a 4-year field monitoring project of soil water retention and the corresponding long-term changes in landslide susceptibility after the 2019 Williams Flats Wildfire on the Colville Indian Reservation, WA, USA....AuthorsMustafa Demir, Julio C. Guerra, Farshid Vahedifard, Pete R. Robichaud, Idil Deniz AkinKeywordsSourceCanadian Geotechnical JournalYear2025
- Wildland fuels are fundamental variables in modeled predictions of fire behavior and effects. In forest ecosystems, accumulated forest floor layers, including recently fallen litter and highly decomposed organic material (i.e., duff), often constitute most surface fuel—biomass and stored carbon. Associated error in estimated litter and duff biomass can thus propagate to major sources of uncertainty in predicted fire effects, including tree mortality and smoke production. Distributions of forest floor biomass are difficult to measure, and estimates of litter and duff biomass typically...AuthorsSusan J. Prichard, Deborah G. Nemens, Maureen C. Kennedy, Jessie Thoreson, Lauren C. Satterfield, Paige C. Eagle, Eric M. Rowell, Andrew T. Hudak, Nuria Sánchez-LópezKeywordsSourceFire EcologyYear2025
- This dataset provides estimates of aboveground dry woody biomass density (AGBD) for high northern latitude forests at a 30-m spatial resolution for the year 2020, accounting for >30% of global forest area. The estimates were derived with state-of-the-art earth observation datasets collected from space, including lidar observations from NASA's ICESat-2 and imagery from NASA's Harmonized Landsat/Sentinel-2 project. They are designed for circumpolar boreal-wide mapping from local to global scales and provide the northern component of global forest structure estimates, to which complementary...AuthorsL. Duncanson, P. M. Montesano, A. Zarringhalam, A. Neuenschwander, J. Armston, T. Feng, E. Guenther, S. Hancock, Sean P. Healey, J. R. Kellner, V. Leitold, A. Mandel, D. Minor, M. Purslow, S. Saarela, S. Shah, C. E. Silva, N. Thomas, J. C. White, M. A. Wulder, H. E. Andersen, L. Boschetti, P. A. Fekety, Andrew T. Hudak, K. Sterenczak, N. Sanchez-Lopez, J. WallermanKeywordsSourceOak Ridge, TN: ORNL DAACYear2025
- Climate projections suggest ecosystems could face drastic changes due to global climate change, including more severe and frequent droughts than those recorded in the last century. Paleoclimatic series provide more extensive information than that available with instrumental records, allowing for the analysis of trends and recurrence of extreme events over a longer time periods. The objective of this research was to reconstruct the precipitation variability for southwestern Chihuahua, based on the tree-ring records of Pinus arizonica Engelm. and to assess the influence of ocean atmospheric...AuthorsRosalinda Cervantes-Martínez, Julián Cerano-Paredes, Jose Iniguez, Víctor H. Cambrón-Sandoval, Gerardo Esquivel-Arriaga, José Villanueva-DíazKeywordsSourceForestsYear2025
- Ecologists increasingly recognize that novel computational approaches are critical for effectively addressing the ongoing climate and biodiversity crises. Some of the century’s most substantive methodological developments are in artificial intelligence (AI), including generative AI (GenAI) as well as classical AI and machine learning (ML) approaches, which collectively have spurred advances across all fields of science. In ecology, AI has already been leveraged for diverse applications, ranging from large-scale image recognition for monitoring to conservation decision-making in complex...AuthorsKari Norman, Carl Boettiger, Timothée Poisot, Gavin M. JonesSourceFrontiers in Ecology and the EnvironmentYear2025
- Estimating population demographic parameters and habitat relationships is central to recovery planning for imperiled species. These parameters and relationships are often unavailable for rare and elusive species but are necessary to inform their conservation and management. The Humboldt marten (Martes caurina humboldtensis) is a subspecies of the Pacific marten that was historically distributed in coastal forests in California and Oregon, was extirpated from more than 95 % of its historical distribution, and is listed as endangered in California and federally listed as threatened. To...AuthorsErika L. Anderson, Marie E. Martin, Micaela S. Gunther, Kristine L. Pilgrim, Scott A. Demers, Sean M. MatthewsKeywordsSourceGlobal Ecology and ConservationYear2025
- Background: Understanding fire regimes is important for developing conservation strategies for drought-tolerant species with serotine cones; although, no fire-frequency studies have been undertaken in Pinus greggii a serotine species. Hypotheses: Fire occurrence in Pinus greggii stands are related to climatic conditions prior to and during the fire year, but fire regimes have changed in the last two decades induced by anthropogenic disturbances changing the fire regime. Studied species: Pinus greggii Engelm. Descriptive statistics of the fire regime. Superposed Epoch Analysis. Study site...AuthorsAdin Helber Velazquez-Perez, Valentín José Reyes-Hernández, Armando Gómez-Guerrero, José Villanueva-Díaz, Jose IniguezSourceBotanical SciencesYear2025
- Rangelands are extensive ecosystems, providing important ecosystem services while undergoing continuous change. As a result, improved monitoring technologies can help better characterize vegetation change. Satellite remote sensing has proven effective in this regard, tracking vegetation dynamics at broad and fine scales. We leveraged the spatial, spectral, and temporal resolution of Sentinel-2 satellites to estimate fractional cover and canopy gap across rangelands of the western United States. We produced annual, 10 m spatial resolution estimates of fractional cover and canopy gap size...AuthorsBrady W. Allred, Sarah E. McCord, Timothy J. Assal, Brandon T. Bestelmeyer, Chad S. Boyd, Alexander C. Brooks, Samantha M. Cady, Michael C. Duniway, Samuel D. Fuhlendorf, Shane A. Green, Georgia R. Harrison, Eric R. Jensen, Emily J. Kachergis, Anna C. Knight, Chloe M. Mattilio, Brian A. Mealor, David E. Naugle, Dylan O’Leary, Peter J. Olsoy, Erika S. Peirce, Jason R. Reinhardt, Robert K. Shriver, Joseph T. Smith, Jason D. Tack, Ashley M. Tanner, Evan P. Tanner, Dirac Twidwell, Nicholas P. Webb, Scott L. MorfordKeywordsSourceScientific DataYear2025
- The Anthropocene is defined by rapid environmental changes such as biological invasions and shifting disturbance regimes that threaten native species. Understanding the drivers of endangerment for species facing multiple simultaneous threats is challenging without experimental methods. Here, we examined the relative and combined effects of severe wildfires and an early‐stage barred owl ( Strix varia ) invasion on an assemblage of three native forest owl species in the Sierra Nevada, California, USA, leveraging manipulative (lethal barred owl removals) and natural (severe wildfires)...AuthorsJoshua M. Barry, Connor M. Wood, Gavin M. Jones, Kate A. McGinn, Kevin G. Kelly, H. Anu Kramer, Daniel F. Hofstadter, Stefan Kahl, Holger Klinck, Nicholas F. Kryshak, Brian P. Dotters, Kevin N. Roberts, John J. Keane, Elizabeth Ng, M. Zachariah PeeryKeywordsSourceEcological ApplicationsYear2025