John Wesley Powell Center for Analysis and Synthesis

Publications

Filter Total Items: 164
Publication Thumbnail
Year Published: 2016

Body size distributions signal a regime shift in a lake ecosystem

Communities of organisms, from mammals to microorganisms, have discontinuous distributions of body size. This pattern of size structuring is a conservative trait of community organization and is a product of processes that occur at multiple spatial and temporal scales. In this study, we assessed whether body size patterns serve as an indicator of...

Spanbauer, Trisha; Allen, Craig R.; Angeler, David G.; Eason, Tarsha; Fritz, Sherilyn C.; Garmestani, Ahjond S.; Nash, Kirsty L.; Stone, Jeffery R.; Stow, Craig A.; Sundstrom, Shana M.

Publication Thumbnail
Year Published: 2016

Quantitative evidence for the effects of multiple drivers on continental-scale amphibian declines

Since amphibian declines were first proposed as a global phenomenon over a quarter century ago, the conservation community has made little progress in halting or reversing these trends. The early search for a “smoking gun” was replaced with the expectation that declines are caused by multiple drivers. While field observations and...

Grant, Evan H. Campbell; Miller, David A. W.; Schmidt, Benedikt R.; Adams, M.J.; Amburgey, Staci M.; Chambert, Thierry A.; Cruickshank, Sam S.; Fisher, Robert N.; Green, David M.; Hossack, Blake R.; Johnson, Pieter T.J.; Joseph, Maxwell B.; Rittenhouse, Tracy A. G.; Ryan, Maureen E.; Waddle, J. Hardin; Walls, Susan C.; Bailey, Larissa L.; Fellers, Gary M.; Gorman, Thomas A.; Ray, Andrew M.; Pilliod, David S.; Price, Steven J.; Saenz, Daniel; Sadinski, Walt; Muths, Erin L.

Publication Thumbnail
Year Published: 2016

Spatial and temporal patterns of mercury concentrations in freshwater fish across the Western United States and Canada

Methylmercury contamination of fish is a global threat to environmental health. Mercury (Hg) monitoring programs are valuable for generating data that can be compiled for spatially broad syntheses to identify emergent ecosystem properties that influence fish Hg bioaccumulation. Fish total Hg (THg) concentrations were evaluated across the Western...

Eagles-Smith, Collin A.; Ackerman, Joshua T.; Willacker, James J.; Tate, Michael T.; Lutz, Michelle A.; Fleck, Jacob; Stewart, Robin; Wiener, James G.; Evers, David C.; Lepak, Jesse M.; Davis, Jay A.; Pritz, Colleen Flanagan
Eagles-Smith, C.A., Ackerman, J.T., Willacker, J.J., Tate, M., Lutz, M., Fleck, J.A., Stewart, A.R., Wiener, J.G., Evers, D.C., Lepak, J.M., Davis, J.A., and Pritz, C.F., 2016, Spatial and temporal patterns of mercury concentrations in freshwater fish across the Western United States and Canada: Science of the Total Environment, p. 1171-1184, https://doi.org/10.1016/j.scitotenv.2016.03.229.

Publication Thumbnail
Year Published: 2016

Avian mercury exposure and toxicological risk across western North America: A synthesis

Methylmercury contamination of the environment is an important issue globally, and birds are useful bioindicators for mercury monitoring programs. The available data on mercury contamination of birds in western North America were synthesized. Original data from multiple databases were obtained and a literature review was conducted to obtain...

Ackerman, Joshua T.; Eagles-Smith, Collin A.; Herzog, Mark P.; Hartman, C. Alex; Peterson, Sarah H.; Evers, David C.; Jackson, Allyson K.; Elliott, John E.; Vander Pol, Stacy S.; Bryan, Colleen E.
Ackerman, JT, CA Eagles-Smith, MP Herzog, CA Hartman, SH Peterson, DC Evers, AK Jackson, JE Elliott, SS Vander Pol, CE Bryan. 2016-In Press. Avian mercury exposure and toxicological risk across western North America: A synthesis. Science of the Total Environment. doi:10.1016/j.scitotenv.2016.03.071.

Publication Thumbnail
Year Published: 2016

Hg concentrations in fish from coastal waters of California and Western North America

The State of California conducted an extensive and systematic survey of mercury (Hg) in fish from the California coast in 2009 and 2010. The California survey sampled 3483 fish representing 46 species at 68 locations, and demonstrated that methylHg in fish presents a widespread exposure risk to fish consumers. Most of the locations sampled (37 of...

Davis, Jay; Ross, John; Bezalel, Shira; Sim, Lawrence; Bonnema, Autumn; Ichikawa, Gary; Heim, Wes; Schiff, Kenneth C; Eagles-Smith, Collin A.; Ackerman, Joshua T.
Davis, J.A., Ross, J.M., Bezalel, S., Sim, L., Bonnema, A., Ichikawa, G., Heim, W., Schiff, K., Eagles-Smith, C.A., Ackerman, J.T., 2016, Hg concentrations in fish from coastal waters of California and Western North America: Science of the Total Environment, p. online, http://dx.doi.org/10.1016/j.scitotenv.2016.03.093.

Publication Thumbnail
Year Published: 2016

Conditional vulnerability of plant diversity to atmospheric nitrogen deposition across the United States

Atmospheric nitrogen (N) deposition has been shown to decrease plant species richness along regional deposition gradients in Europe and in experimental manipulations. However, the general response of species richness to N deposition across different vegetation types, soil conditions, and climates remains largely unknown even though responses may...

Simkin, Samuel M.; Allen, Edith B.; Bowman, William D.; Clark, Christopher L.; Belnap, Jayne; Brooks, Matthew L.; Cade, Brian S.; Collins, Scott L.; Geiser, Linda H.; Gilliam, Frank S.; Jovan, Sarah E.; Pardo, Linda H.; Schulz, Bethany K.; Stevens, Carly J.; Suding, Katharine N.; Throop, Heather L.; Waller, Donald M.
Simkin, SM, EB Allen, WD Bowman, CM Clark, J Belnap, ML Brooks, BS Cade, SL Collins, LH Geiser, FS Gilliam, SE Jovan, LH Pardo, BK Schulz, CJ Stevens, KN Suding, HL Throop, DM Waller. 2016. Conditional vulnerability of plant diversity to atmospheric nitrogen deposition across the United States. PNAS. doi: 10.1073/pnas.1515241113

Publication Thumbnail
Year Published: 2016

Quasi-extinction risk and population targets for the Eastern, migratory population of monarch butterflies (Danaus plexippus)

The Eastern, migratory population of monarch butterflies (Danaus plexippus), an iconic North American insect, has declined by ~80% over the last decade. The monarch’s multi-generational migration between overwintering grounds in central Mexico and the summer breeding grounds in the northern U.S. and southern Canada is celebrated in all three...

Semmens, Brice X.; Semmens, Darius J.; Thogmartin, Wayne E.; Wiederholt, Ruscena; Lopez-Hoffman, Laura; Diffendorfer, James E.; Pleasants, John M.; Oberhauser, Karen S.; Taylor, Orley R.
Semmens BX, Semmens DJ, Thogmartin WE, et al. Quasi-extinction risk and population targets for the Eastern, migratory population of monarch butterflies (Danaus plexippus). Scientific Reports. 2016;6:23265. doi:10.1038/srep23265.

Publication Thumbnail
Year Published: 2016

Hydrologic indicators of hot spots and hot moments of mercury methylation potential along river corridors

The biogeochemical cycling of metals and other contaminants in river-floodplain corridors is controlled by microbial activity responding to dynamic redox conditions. Riverine flooding thus has the potential to affect speciation of redox-sensitive metals such as mercury (Hg). Therefore, inundation history over a period of decades potentially holds...

Singer, Michael B.; Harrison, Lee R.; Donovan, Patrick M.; Blum, Joel D.; Marvin-DiPasquale, Mark C.

Publication Thumbnail
Year Published: 2016

Surface-air mercury fluxes across Western North America: A synthesis of spatial trends and controlling variables

Mercury (Hg) emission and deposition can occur to and from soils, and are an important component of the global atmospheric Hg budget. This paper focuses on synthesizing existing surface-air Hg flux data collected throughout the Western North American region and is part of a series of geographically focused Hg synthesis projects. A database of...

Eckley, Chris S.; Tate, Michael T.; Lin, Che-Jen; Gustin, Mae S.; Dent, Stephen; Eagles-Smith, Collin A.; Lutz, Michelle A.; Wickland, Kimberly; Wang, Bronwen; Gray, John E.; Edwards, Grant; Krabbenhoft, David P.; Smith, David B.
Eckley, C.S., Tate, M.T., Lin, C., Gustin, M., Dent, S., Eagles-Smith, C.A., Lutz, M., Wickland, K.P., Wang, B., Gray, J.E., Edwards, G.C., Krabbenhoft, D.P., Smith, D.B., 2016, Surface-air mercury fluxes across Western North America- a synthesis of spatial trends and controlling variables: Science of the Total Environment, p. online.

Publication Thumbnail
Year Published: 2016

Deserts

The deserts of California (Lead photo, Fig. 1) occupy approximately 38% of California’s landscape (Table 1) and consist of three distinct deserts: the Great Basin Desert, Mojave Desert, and Colorado Desert, the latter of which is a subdivision of the Sonoran Desert (Brown and Lowe 1980). The wide range of climates and geology found within each of...

Belnap, Jayne; Webb, Robert H.; Esque, Todd C.; Brooks, Matthew L.; DeFalco, Lesley; MacMahon, James A.

Publication Thumbnail
Year Published: 2015

Accelerating advances in continental domain hydrologic modeling

In the past, hydrologic modeling of surface water resources has mainly focused on simulating the hydrologic cycle at local to regional catchment modeling domains. There now exists a level of maturity among the catchment, global water security, and land surface modeling communities such that these communities are converging toward continental...

Archfield, Stacey A.; Clark, Martyn; Arheimer, Berit; Hay, Lauren E.; McMillan, Hilary; Kiang, Julie E.; Seibert, Jan; Hakala, Kirsti; Bock, Andrew R.; Wagener, Thorsten; Farmer, William H.; Andreassian, Vazken; Attinger, Sabine; Viglione, Alberto; Knight, Rodney; Markstrom, Steven L.; Over, Thomas M.

Publication Thumbnail
Year Published: 2015

Seismic hazard assessment: Honing the debate, testing the models

Four workshops held in 2013–2014 at the U.S. Geological Survey (USGS) John Wesley Powell Center for Analysis and Synthesis brought together university, government, and insurance industry scientists from countries that straddle plate boundaries and those in plate interiors. Participants were invited; the workshops’ goals involved developing tests...

Stein, Ross; Stirling, Mark W.
Stein, R. S., and M. W. Stirling (2015), Seismic hazard assessment: Honing the debate, testing the models, Eos, 96, doi:10.1029/2015EO031841