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Isotopic niche partitioning in a multi-species assemblage
Multi-species assemblages can help identify key resources in their habitat by evaluating how they are partitioning their resources. Here we used the isotopic niche of loggerhead, Kemp’s ridley, and green sea turtles to assess their ecological niche within a Gulf of Mexico bay. Additionally, we assessed temporal and size-class variation in their diets by comparing the δ13C and δ15N values over vari
Authors
Carson L. Arends, Hannah B. Vander Zanden, Margaret Lamont
Steady-state forms of channel profiles shaped by debris flow and fluvial processes
Debris flows regularly traverse bedrock channels that dissect steep landscapes, but our understanding of bedrock erosion by debris flows and their impact on steepland morphology is still rudimentary. Quantitative models of steep bedrock channel networks are based on geomorphic transport laws designed to represent erosion by water-dominated flows. To quantify the impact of debris flow erosion on st
Authors
Luke A. McGuire, Scott W. McCoy, Odin Marc, William Struble, Katherine R. Barnhart
Expanding our view of the cold-water coral niche and accounting of the ecosystem services of the reef habitat
Coral reefs are iconic ecosystems that support diverse, productive communities in both shallow and deep waters. However, our incomplete knowledge of cold-water coral (CWC) niche space limits our understanding of their distribution and precludes a complete accounting of the ecosystem services they provide. Here, we present the results of recent surveys of the CWC mound province on the Blake Plateau
Authors
Erick E. Cordes, Amanda Demopoulos, Andrew Davies, Ryan Gasbarro, Alexandria Rhoads, Elizabeth Lobecker, Dereck Sowers, Jason Chaytor, Cheryl Morrison, Alexis Marie Weinnig, Sandra Brooke, Jay J. Lunden, Furu Mienis, Samantha B. Joye, Andrea M. Quattrini, Tracey Sutton, Catherine McFadden, Jill Bourque, Jennifer McClain Counts, Brian D. Andrews, Melissa Betters, Peter Etnoyer, Gary Wolff, Bernie Bernard, James Brooks, Michael Rasser, Caitlin Adams
Assessing the added value of antecedent streamflow alteration information in modeling stream biological condition
In stream systems, disentangling relationships between biology and flow and subsequent prediction of these relationships to unsampled streams is a common objective of large-scale ecological modeling. Often, streamflow metrics are derived from aggregating continuous streamflow records available at a subset of stream gages into long-term flow regime descriptors. Despite demonstrated value, shortcomi
Authors
Taylor E Woods, Ken Eng, Daren Carlisle, Matthew Joseph Cashman, Michael Meador, Karen R. Ryberg, Kelly O. Maloney
Considerations for colorblind individuals on selecting colorimetric or fluorescent dye assay outcomes
A disadvantage of colorimetric detection in nucleic acid amplification assays is the possibility that a colorblind individual may interpret colors differently than observers with full-color vision. Using an isothermal amplification assay, the ability of colorblind individuals to distinguish between positive and negative results for four dyes was tested. Five individuals with self-reported colorbli
Authors
Kirstyn Loyva, Erik K. Hofmeister, Fiona Georgousi, Constance Roderick, Rebecca A. Cole
Rethinking cost-share programs in consideration of economic equity: A case study of wildfire risk mitigation assistance for private landowners
Public agencies and organizations often deliver financial assistance through cost sharing, in which recipients contribute some portion toward total costs. However, cost sharing might raise equity concerns if it reduces participation among populations with lower incomes. Here, we revisit a past study using a richer dataset (n=1,689) to assess whether stated income levels affect survey respondents'
Authors
James Meldrum, Patricia A. Champ, Hannah Brenkert-Smith, Christopher M. Barth, Abby Elizabeth McConnell, Carolyn Wagner, Colleen Donovan
Predicting daily river chlorophyll concentrations at a continental scale
Eutrophication is one of the largest threats to aquatic ecosystems and chlorophyll a measurements are relevant indicators of trophic state and algal abundance. Many studies have modeled chlorophyll a in rivers but model development and testing has largely occurred at individual sites which hampers creating generalized models capable of making broad-scale predictions. To address this gap, we compil
Authors
Philip Savoy, Judson Harvey
Snag dynamics and surface fuel loads in the Sierra Nevada: Predicting the impact of the 2012–2016 drought
Forest die-backs linked to extreme droughts are expected to increase as the climate dries and warms. An example is the 2012-2016 hotter drought in California that induced widespread tree mortality in the Sierra Nevada, California. The sudden increase in snags (i.e., standing dead trees) raised immediate concerns about their impact on wildfire hazard and longer-term questions about their impact on
Authors
Hudson Northrop, Jodi N. Axelson, Adrian Das, Nathan L. Stephenson, Emilio Vilanova, Scott L. Stephens, John J. Battles
Marginal value analysis reveals shifting importance of migration habitat for waterfowl under a changing climate
Migratory waterfowl are an important resource for consumptive and non-consumptive users alike and provide tremendous economic value in North America. These birds rely on a complex matrix of public and private land for forage and roosting during migration and wintering periods, and substantial conservation effort focuses on increasing the amount and quality of target habitat. Yet, the value of habi
Authors
Ryan C. Burner, Benjamin Donald Golas, Kevin J. Aagaard, Eric V. Lonsdorf, Wayne E. Thogmartin
Creating oriented and precisely sectioned mineral mounts for in situ chemical analyses—An example using olivine for diffusion chronometry studies
Diffusion chronometry is now a widely applied methodology for determining the rates and timescales of geologic processes from the chemical zoning observed in minerals. Despite the popularity of the method, several challenges still remain during its application, including: (1) the random sectioning of minerals either in thin sections or grain mounts in which both off-center and oblique sections con
Authors
Kendra J. Lynn, Liliana G. Desmither
Shifted sediment-transport regimes by climate change and amplified hydrological variability in cryosphere-fed rivers
Climate change affects cryosphere-fed rivers and alters seasonal sediment dynamics, affecting cyclical fluvial material supply and year-round water-food-energy provisions to downstream communities. Here, we demonstrate seasonal sediment-transport regime shifts from the 1960s to 2000s in four cryosphere-fed rivers characterized by glacial, nival, pluvial, and mixed regimes, respectively. Spring see
Authors
Tinghu Zhang, Dongfeng Li, Amy E. East, Albert J. Kettner, James L. Best, Jinren Ni, Xixi Lu
Alternative lifestyles: A plague persistence hypothesis
Several explanations have been posited for how the plague bacterium (Yersinia pestis) reemerges during sylvatic cycles within the same foci over many years, and often without direct evidence of host die-offs. One prevalent view is that transmission-optimized Y. pestis bacteria, exhibiting epizootic/enzootic behavior, almost continually replicate and survive through repeated, linked, host-centered
Authors
Jeffrey Wimsatt, David A. Eads, Marc R. Matchett, Dean E. Biggins