Publications
Filter Total Items: 243
Rate of tree carbon accumulation increases continuously with tree size Rate of tree carbon accumulation increases continuously with tree size
Forests are major components of the global carbon cycle, providing substantial feedback to atmospheric greenhouse gas concentrations. Our ability to understand and predict changes in the forest carbon cycle—particularly net primary productivity and carbon storage - increasingly relies on models that represent biological processes across several scales of biological organization, from...
Authors
N.L. Stephenson, A.J. Das, R. Condit, S.E. Russo, P.J. Baker, N.G. Beckman, D.A. Coomes, E.R. Lines, W.K. Morris, N. Rüger, E. Alvarez, C. Blundo, S. Bunyavejchewin, G. Chuyong, S.J. Davies, A. Duque, C.N. Ewango, O. Flores, J.F. Franklin, H.R. Grau, Z. Hao, M. E. Harmon, S.P. Hubbell, D. Kenfack, Y. Lin, J.-R. Makana, A. Malizia, L.R. Malizia, R.J. Pabst, N. Pongpattananurak, S.-H. Su, I-F. Sun, S. Tan, D. Thomas, P. J. van Mantgem, X. Wang, S.K. Wiser, M.A. Zavala
Market forces and technological substitutes cause fluctuations in the value of bat pest-control services for cotton Market forces and technological substitutes cause fluctuations in the value of bat pest-control services for cotton
Critics of the market-based, ecosystem services approach to biodiversity conservation worry that volatile market conditions and technological substitutes will diminish the value of ecosystem services and obviate the “economic benefits” arguments for conservation. To explore the effects of market forces and substitutes on service values, we assessed how the value of the pest-control...
Authors
Laura López-Hoffman, Ruscena Wiederholt, Chris Sansone, Kenneth J. Bagstad, Paul M. Cryan, James E. Diffendorfer, Joshua Goldstein, Kelsie LaSharr, John Loomis, Gary McCracken, Rodrigo A. Medellin, Amy Russell, Darius J. Semmens
Inferences about population dynamics from count data using multi-state models: A comparison to capture-recapture approaches Inferences about population dynamics from count data using multi-state models: A comparison to capture-recapture approaches
Wildlife populations consist of individuals that contribute disproportionately to growth and viability. Understanding a population's spatial and temporal dynamics requires estimates of abundance and demographic rates that account for this heterogeneity. Estimating these quantities can be difficult, requiring years of intensive data collection. Often, this is accomplished through the...
Authors
Evan H. Campbell Grant, Elise Zipkin, Sillett T. Scott, Richard Chandler, J. Andrew Royle
Automated Cropland Classification Algorithm (ACCA) for California using multi-sensor remote sensing Automated Cropland Classification Algorithm (ACCA) for California using multi-sensor remote sensing
Increasing pressure to feed the growing population with scarce water resources requires accurate and routine cropland mapping. This paper develops and implements a rule-based automated cropland classification algorithm (ACCA) using multi-sensor remote sensing data. Pixel-by-pixel accuracy assessments showed that ACCA produced an overall accuracy of 96 percent (Khat = 0.8) when tested...
Authors
Zhuoting Wu, Prasad S. Thenkabail, James Verdin
Powell Center Newsletter, Volume 1, Issue 2 Powell Center Newsletter, Volume 1, Issue 2
Bi-annual newsletter for the John Wesley Powell Center for Analysis and Synthesis, covering news from the last half of FY2014
Authors
Marcia McNiff
Panarchy: theory and application Panarchy: theory and application
The concept of panarchy provides a framework that characterizes complex systems of people and nature as dynamically organized and structured within and across scales of space and time. It has been more than a decade since the introduction of panarchy. Over this period, its invocation in peer-reviewed literature has been steadily increasing, but its use remains primarily descriptive and...
Authors
Craig R. Allen, David G. Angeler, Ahjond S. Garmestani, Lance H. Gunderson, Crawford S. Holling
Powell Center Newsletter, Volume 1, Issue 1 Powell Center Newsletter, Volume 1, Issue 1
A biannual newsletter for the John Wesley Powell Center for Analysis and Synthesis that highlights Powell Center activities and accomplishments.
Authors
Marcia McNiff
The impact of climate and reservoirs on longitudinal riverine carbon fluxes from two major watersheds in the Central and Intermontane West The impact of climate and reservoirs on longitudinal riverine carbon fluxes from two major watersheds in the Central and Intermontane West
A nested sampling network on the Colorado (CR) and Missouri Rivers (MR) provided data to assess impacts of large-scale reservoir systems and climate on carbon export. The Load Estimator (LOADEST) model was used to estimate both dissolved inorganic and organic carbon (DIC and DOC) fluxes for a total of 22 sites along the main stems of the CR and MR. Both the upper CR and MR DIC and DOC...
Authors
Sarah M. Stackpoole, Edward G. Stets, Robert G. Striegl
Modeling structured population dynamics using data from unmarked individuals Modeling structured population dynamics using data from unmarked individuals
The study of population dynamics requires unbiased, precise estimates of abundance and vital rates that account for the demographic structure inherent in all wildlife and plant populations. Traditionally, these estimates have only been available through approaches that rely on intensive mark–recapture data. We extended recently developed N-mixture models to demonstrate how demographic...
Authors
Evan H. Campbell Grant, Elise Zipkin, James T. Thorson, Kevin See, Heather J. Lynch, Yoichiro Kanno, Richard Chandler, Benjamin H. Letcher, J. Andrew Royle
Resilience to stress and disturbance, and resistance to Bromus tectorum L. invasion in cold desert shrublands of western North America Resilience to stress and disturbance, and resistance to Bromus tectorum L. invasion in cold desert shrublands of western North America
Alien grass invasions in arid and semi-arid ecosystems are resulting in grass–fire cycles and ecosystem-level transformations that severely diminish ecosystem services. Our capacity to address the rapid and complex changes occurring in these ecosystems can be enhanced by developing an understanding of the environmental factors and ecosystem attributes that determine resilience of native...
Authors
Jeanne C. Chambers, Bethany A. Bradley, Cynthia S. Brown, Carla D'Antonio, Matthew J. Germino, James B. Grace, Stuart P. Hardegree, Richard F. Miller, David A. Pyke
Moving across the border: Modeling migratory bat populations Moving across the border: Modeling migratory bat populations
The migration of animals across long distances and between multiple habitats presents a major challenge for conservation. For the migratory Mexican free-tailed bat (Tadarida brasiliensis mexicana), these challenges include identifying and protecting migratory routes and critical roosts in two countries, the United States and Mexico. Knowledge and conservation of bat migratory routes is...
Authors
Wiederholt Ruscena, Laura López-Hoffman, Jon Cline, Rodrigo Medellin, Paul M. Cryan, Amy Russell, Gary McCracken, Jay Diffendorfer, Darius J. Semmens
Injection-induced earthquakes Injection-induced earthquakes
Earthquakes in unusual locations have become an important topic of discussion in both North America and Europe, owing to the concern that industrial activity could cause damaging earthquakes. It has long been understood that earthquakes can be induced by impoundment of reservoirs, surface and underground mining, withdrawal of fluids and gas from the subsurface, and injection of fluids...
Authors
William L. Ellsworth