Publications
Filter Total Items: 234
Habitat structure and body size distributions: Cross-ecosystem comparison for taxa with determinate and indeterminate growth Habitat structure and body size distributions: Cross-ecosystem comparison for taxa with determinate and indeterminate growth
Habitat structure across multiple spatial and temporal scales has been proposed as a key driver of body size distributions for associated communities. Thus, understanding the relationship between habitat and body size is fundamental to developing predictions regarding the influence of habitat change on animal communities. Much of the work assessing the relationship between habitat...
Authors
Kirsty Nash, Craig Allen, Chris Barichievy, Magnus Nystrom, Shana Sundstrom, Nicholas Graham
Replacement cost valuation of Northern Pintail (Anas acuta) subsistence harvest in Arctic and sub-Arctic North America Replacement cost valuation of Northern Pintail (Anas acuta) subsistence harvest in Arctic and sub-Arctic North America
Migratory species provide economically beneficial ecosystem services to people throughout their range, yet often, information is lacking about the magnitude and spatial distribution of these benefits at regional scales. We conducted a case study for Northern Pintails (hereafter pintail) in which we quantified regional and sub-regional economic values of subsistence harvest to indigenous
Authors
Joshua Goldstein, Wayne Thogmartin, Kenneth Bagstad, James Dubovsky, Brady J. Mattsson, Darius Semmens, Laura López-Hoffman, James E. Diffendorfer
Spatial variability in survival of adult brook trout within two intensively surveyed headwater stream networks Spatial variability in survival of adult brook trout within two intensively surveyed headwater stream networks
Headwater stream networks are considered heterogeneous riverscapes, but it is challenging to characterize spatial variability in demographic rates. We estimated site-scale (50 m) survival of adult (>age 1+) brook trout (Salvelinus fontinalis) within two intensively surveyed headwater stream networks by applying an open-population N-mixture approach to count data collected over two...
Authors
Yoichiro Kanno, Benjamin Letcher, Jason Vokoun, Elise Zipkin
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. 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. 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 Bagstad, Paul Cryan, James E. Diffendorfer, Joshua Goldstein, Kelsie LaSharr, John Loomis, Gary McCracken, Rodrigo A. Medellin, Amy Russell, Darius 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 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 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 Allen, David G. Angeler, Ahjond Garmestani, Lance Gunderson, Crawford 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 Stackpoole, Edward G. Stets, Robert 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 Thorson, Kevin See, Heather J. Lynch, Yoichiro Kanno, Richard Chandler, Benjamin H. Letcher, J. Andrew Royle