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Displaying 7,021 - 7,030 of 64,641 Publications- Identification of introduced species can be important to understanding ecological systems and meeting conservation and management goals, but the process can be surprisingly challenging. The Klamath smallscale sucker Catostomus rimiculusseems likely to be native to the Smith River because the drainage separates two basins believed to be within the fish's native range, the Rogue and Klamath rivers. Further, C. rimiculusis broadly distributed in the Smith River, and the indigenous Dee-ni’ People of the Smith River have a unique word for sucker. Nonetheless, a historical survey of fishes that...AuthorsAndrew P. Kinziger, Jason L. White, Rodney J. Nakamoto, Bret C. HarveyKeywordsSourceJournal of Fish Biology. 98(5): 1321-1328Year2021
- Epigenetic modifications such as DNA methylation are a potential mechanism for trees to respond to changing environments. However, it remains controversial the extent to which DNA methylation impacts ecologically important traits that influence fitness. In this study, we used reduced-representation bisulfite sequencing to associate genomic and epigenomic variation with seven phenotypic traits related to growth, leaf function, and disease susceptibility in 160 valley oak (Quercus lobata) saplings planted across two common gardens in California. We found that DNA methylation was associated...AuthorsLuke Browne, Brandon MacDonald, Sorel Fitz-Gibbon, Jessica W. Wright, Victoria L. SorkKeywordsSourceForests. 12(5): 569Year2021
- Salmonids adaptively select when in the daily light cycle to feed, and they use different habitat at different times of day; however, the data and methods used to evaluate management actions like instream flows and restoration projects typically consider daytime only. Our new model, inSTREAM 7, lets us investigate how management decisions might change if we consider the full daily light cycle. The model explicitly represents the effects of light intensity on feeding efficiency, predation risk, and, therefore, foraging behavior. We simulated trout population response to a range of flows at...AuthorsSteven F. Railsback, Bret C. Harvey, Daniel AyllónKeywordsSourceTransactions of the American Fisheries Society. 150(1): 130-143.Year2021
- Assessing the scope and severity of threats is necessary for evaluating impacts on populations to inform conservation planning. Quantitative threat assessment often requires monitoring programs that provide reliable data over relevant spatial and temporal scales, yet such programs can be difficult to justify until there is an apparent stressor. Leveraging efforts of wildlife management agencies to record winter counts of hibernating bats, we collated data for 5 species from over 200 sites across 27 U.S. states and 2 Canadian provinces from 1995 to 2018 to determine the impact of white-nose...AuthorsTina L. Cheng, Jonathan D. Reichard, Jeremy T. H. Coleman, Ted Weller, Wayne E. Thogmartin, Brian E. Reichert, Alyssa B. Bennett, Hugh G. Broders, Joshua Campbell, Katherine Etchison, Daniel J. Feller, Richard Geboy, Traci Hemberger, Carl Herzog, Alan C. Hicks, Sandra Houghton, Jessica Humber, Joseph A. Kath, R. Andrew King, Susan Loeb, Ariane Massé, Katrina M. Morris, Holly Niederriter, Gerda Nordquist, Roger W. Perry, Richard T. Reynolds, D. Blake Sasse, Michael R. Scafini, Richard C. Stark, Craig W. Stihler, Steven C. Thomas, Gregory G. Turner, Shevenell Webb, Bradford J. Westrich, Winifred F. FrickKeywordsSourceConservation Biology. 35(5): 1586-1597Year2021
- Understanding the transport of dissolved organic carbon (DOC) and nitrogen (N) as water flows through headwater basins is important for predicting downstream water quality. With increased recognition of climatic impact on nutrient transport, more studies are needed in headwater basins experiencing a Mediterranean-type climate, such as those of the Sierra Nevada, California. We analyzed water samples collected over 5 years from eight low-order and mixed-conifer watersheds to elucidate the temporal variation of water chemistry and evaluate their responses to prolonged drought and low-intensit...AuthorsYang Yang, Stephen C. Hart, Emma P. McCorkle, Erin M. Stacy, Morgan E. Barnes, Carolyn T. Hunsaker, Dale W. Johnson, Asmeret Asefaw. BerheKeywordsSourceEcosystems. 24(8): 1853-1874Year2021
Landscape use by fishers (Pekania pennanti): core areas differ in habitat than the entire home range
Home ranges have long been studied in animal ecology. Core areas may be used at a greater proportion than the rest of the home range, implying the core contains dependable resources. The Pacific fisher (Pekania pennanti(Erxleben, 1777)) is a rare mesocarnivore occupying a small area in the Sierra Nevada Mountains, California, USA. Once statewide, fishers declined in the 1900s due to trapping, habitat fragmentation, and development. Recently, drought induced by climate change may be affecting this population. We examined space use of fishers in their core versus their home range for levels...AuthorsJennifer R. Kordosky, Eric M. Gese, Craig M. Thompson, Patricia A. Terletzky, Kathryn L. Purcell, Jon D. SchneidermanKeywordsSourceCanadian Journal of Zoology. 99(4): 289-297Year2021- Aim Landscape and climatic change are promoting range shifts, potentially leading to competition and hybridization between formerly isolated species. However, density-dependent interactions can impede the timely identification of associated conservation problems. The barred owl's expansion into the spotted owl's range provides a natural experiment to test for density dependence in niche overlap and hybridization in the early versus late stages of a biological invasion, thus illuminating an important biogeographical process. Location Pacific Northwest, USA to the northern Sierra Nevada,...AuthorsConnor M. Wood, Nick Kryshak, Michaela Gustafson, Daniel F. Hofstadter, Brendan K. Hobart, Sheila A. Whitmore, Brian P. Dotters, Kevin N. Roberts, John J. Keane, Sarah Sawyer, Rocky J. Gutiérrez, M. Zachariah. PeeryKeywordsSourceDiversity and Distributions. 27(5): 901-912Year2021
- Climate change is expected to increase fire activity in many regions of the globe, but the relative role of human vs. lightning-caused ignitions on future fire regimes is unclear. We developed statistical models that account for the spatiotemporal ignition patterns by cause in the eastern slopes of the Cascades in Oregon, USA. Projected changes in energy release component from a suite of climate models were used with our model to quantify changes in frequency and extent of human and lightning-caused fires and record-breaking events based on sizes of individual fires between contemporary...AuthorsMichelle A. Day, Haiganoush K. Preisler, John T. Abatzoglou, Ana M. G. Barros, Meg A. Krawchuk, Rachel Houtman, Alan AgerKeywordsSourceEnvironmental Research Letters. 16: 064081.Year2021
- Protecting wildlife corridors is a common management problem in regions of industrial forestry. In boreal Canada, human disturbances have negatively affected woodland caribou populations (Rangifer tarandus caribou), which prefer to function in large undisturbed areas. We present a linear programming model that allocates a fixed-width corridor between isolated caribou ranges and estimates its impact on harvest activities. Our corridor placement problem minimizes total resistance for caribou passing through the corridor, which is protected by a prohibition on all economic activities. We link...AuthorsDenys Yemshanov, Robert G. Haight, Ning Liu, Rob Rempel, Frank H. H. Koch, Art RodgersKeywordsSourceOptimization LettersYear2021
- Problem, research strategy, and findings: Several U.S. cities have implemented vacant lot greening programs as planning strategies to address decreased tax base, crime, and other issues associated with high land vacancy in marginalized neighborhoods, yet little is known about the benefits of programs that transfer city-owned lots to private owners. Using a mixed methods approach, we studied whether and how private ownership matters for vacant lot condition-care in Chicago's (IL) Large Lot Program, which allows property owners to purchase vacant city lots on their block for $1. We compared...AuthorsAlessandro Rigolon, Debolina Banerjee, Paul H. H. Gobster, Sara Hadavi, William StewartKeywordsSourceJournal of the American Planning AssociationYear2021