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- The water balance is an essential tool for hydrologic studies and quantifying water-balance components is the focus of many research catchments. A fundamental question remains regarding the appropriateness of water-balance closure assumptions when not all components are available. In this study, we leverage in-situ measurements of water fluxes and storage from the Southern Sierra Critical Zone Observatory (SSCZO) and the Kings River Experimental Watersheds (KREW) to investigate annual water-balance closure errors across large (1016–5389 km2) river basins and small (0.5–5 km2) headwater-catc...AuthorsMohammad Safeeq, Ryan R. Bart, Norman F. Pelak, Chandan K. Singh, David Dralle, Peter Hartsough, Joseph WagenbrennerSourceHydrological Processes. 35(5): e14199Year2021
- A common parameter in hydrological modeling frameworks is root zone water storage capacity (SR[L]), which mediates plant water availability during dry periods as well as the partitioning of rainfall between runoff and evapotranspiration. Recently, a simple flux-tracking-based approach was introduced to estimate the value of SR(Wang-Erlandsson et al., 2016). Here, we build upon this original method, which we argue may overestimate SRin snow-dominated catchments due to snow melt and evaporation processes. We propose a simple extension to the method presented by Wang-Erlandsson et al. (2016)...AuthorsDavid Dralle, W. Jesse Hahm, K. Dana Chadwick, Erica McCormick, Daniella M. RempeSourceHydrology and Earth System Sciences. 25(5): 2861-2867Year2021
- Integrating remote sensing into assessments of carbon stocks and fluxes has advanced our understanding of how global change affects landscapes and our capacity to support decision making about forest management. However, there remains a lack of detailed and actionable analyses conducted across widely ranging environmental conditions that are appropriate for tactical planning. We used airborne laser scanning data and multi-source satellite imagery to estimate forest aboveground carbon density and gross primary production, and to map forest cover across the main Hawaiian Islands. We used...AuthorsAdrián Pascual, Christian P. Giardina, Paul C. Selmants, Leah J. Laramee, Gregory P. AsnerSourceForest Ecology and Management. 494(3): 119343Year2021
- Climate change is amplifying the frequency and severity of droughts and wildfires in many forests. In the western United States, fuel reduction treatments, both mechanical and prescribed fire, are widely used to increase resilience to wildfire but their effect on resistance to drought and beetle mortality is not as well understood. We followed more than 10,000 mapped and tagged trees in a mixed-conifer forest following mechanical thinning and/or prescribed burning treatments in 2001 through the extreme 2012–2016 drought in California. Mortality varied by tree species from 3% of incense-ceda...AuthorsZachary Steel, M. J. Goodwin, M. D. Meyer, G. A. Fricker, H. S. J. Zald, M. D. Hurteau, Malcolm P. NorthKeywordsSourceEcosphere. 12(1): e03344Year2021
- 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