Hydrologic connectivity to streams increases nitrogen and phosphorus inputs and cycling in soils of created and natural floodplain wetlands
Kristin L. Wolf, Gregory E. Noe, Changwoo Ahn
2013, Journal of Environmental Quality (42) 1245-1255
Greater connectivity to stream surface water may result in greater inputs of allochthonous nutrients that could stimulate internal nitrogen (N) and phosphorus (P) cycling in natural, restored, and created riparian wetlands. This study investigated the effects of hydrologic connectivity to stream water on soil nutrient fluxes in plots (n =...
Pre-eruptive magmatic conditions at Augustine Volcano, Alaska, 2006: Evidence from amphibole geochemistry and textures
Sarah De Angelis, Jessica D Larsen, Michelle L. Coombs
2013, Journal of Petrology (54) 1939-1961
Variations in the geochemistry and texture of amphibole phenocrysts erupted from Augustine Volcano in 2006 provide new insights into pre- and syn-eruptive magma storage and mixing. Amphiboles are rare but present in all magma compositions (low- to high-silica andesites) from the 3 month long eruption. Unzoned magnesiohornblende in the high-...
Fish population failure caused by an environmental estrogen is long-lasting and regulated by direct and parental effects on survival and fecundity
Adam R. Schwindt, Dana L. Winkelman
2013, Thesis, The population ecology of fathead minnows (<i>Pimephales promelas</i>) in estrogen contaminated environments
Despite significant research demonstrating effects of estrogens such as 17α - ethinylestradiol (EE2) on fish, the underlying mechanisms regulating population failure are unknown. Projected water shortages could leave waterways increasingly dominated by wastewater effluent and understanding mechanisms is necessary for conservation and management. Here we identify mechanisms of...
Integrated hydrologic modeling of a transboundary aquifer system —Lower Rio Grande
Randall T. Hanson, Wolfgang Schmid, Jacob E. Knight, Thomas Maddock III
2013, Conference Paper, MODFLOW and more 2013--Translating science into practice
For more than 30 years the agreements developed for the aquifer systems of the lower Rio Grande and related river compacts of the Rio Grande River have evolved into a complex setting of transboundary conjunctive use. The conjunctive use now includes many facets of water rights, water use, and emerging...
Riparian restoration in the context of Tamarix control in the western United States: Chapter 23
Patrick B. Shafroth, David M. Merritt, Mark K. Briggs, Vanessa B. Beauchamp, Kenneth D. Lair, Michael L. Scott, Anna Sher
Anna Sher, Martin F. Quigley, editor(s)
2013, Book chapter
This chapter focuses on the restoration of riparian systems in the context of Tamarix control—that is, Tamarix-dominated sites are converted to a replacement vegetation type that achieves specific management goals and helps return parts of the system to a desired and more natural state or dynamic. It reviews research related...
Priority data on marine and estuarine resources within northeastern National Parks: Inventory and acquisition needs
Tracy E. Hart, Hilary A. Neckles, Blaine S. Kopp
2013, Natural Resource Report NPS/NCBN/NRR—2013/612
The purpose of this project was to guide development of a strategy for the inventory and mapping of submerged natural resources associated within 10 coastal parks of the National Park Service (NPS) Northeast Region (NER; see Table 1). Priority data needs were identified by the NER Ocean Stewardship Task Force....
Strategies for rapid global earthquake impact estimation: the Prompt Assessment of Global Earthquakes for Response (PAGER) system
Kishor Jaiswal, D.J. Wald
2013, Book chapter, Handbook of seismic risk analysis and management of civil infrastructure systems
This chapter summarizes the state-of-the-art for rapid earthquake impact estimation. It details the needs and challenges associated with quick estimation of earthquake losses following global earthquakes, and provides a brief literature review of various approaches that have been used in the past. With this background, the chapter introduces the operational...
Deep-ocean mineral deposits as a source of critical metals for high- and green-technology applications: Comparison with land-based deposits
James R. Hein, Kira Mizell, Andrea Koschinsky, Tracey Conrad
2013, Ore Geology Reviews (51) 1-14
Spatio-temporal dynamics of pneumonia in bighorn sheep
E. Frances Cassirer, Raina K. Plowright, Kezia R. Manlove, Paul C. Cross, Andrew P. Dobson, Kathleen A. Potter, Peter J. Hudson
2013, Journal of Animal Ecology (82) 518-528
Bighorn sheep mortality related to pneumonia is a primary factor limiting population recovery across western North America, but management has been constrained by an incomplete understanding of the disease. We analysed patterns of pneumonia-caused mortality over 14 years in 16 interconnected bighorn sheep populations to gain insights into underlying disease...
A Method for Telemetry-based Logging of Animal Activity
B. Lardner, J. A. Savidge, R.N. Reed, G.H. Rodda
2013, Herpetological Review
A critique of the use of indicator-species scores for identifying thresholds in species responses
Thomas F. Cuffney, Song S. Qian
2013, Freshwater Science (32) 471-488
Identification of ecological thresholds is important both for theoretical and applied ecology. Recently, Baker and King (2010, King and Baker 2010) proposed a method, threshold indicator analysis (TITAN), to calculate species and community thresholds based on indicator species scores adapted from Dufrêne and Legendre (1997). We tested the ability of...
Persistence and potential effects of complex organic contaminant mixtures in wastewater-impacted streams
Larry B. Barber, Steffanie H. Keefe, Greg K. Brown, Edward T. Furlong, James L. Gray, Dana W. Kolpin, Michael T. Meyer, Mark W. Sandstrom, Steven D. Zaugg
2013, Environmental Science & Technology (47) 2177-2188
Natural and synthetic organic contaminants in municipal wastewater treatment plant (WWTP) effluents can cause ecosystem impacts, raising concerns about their persistence in receiving streams. In this study, Lagrangian sampling, in which the same approximate parcel of water is tracked as it moves downstream, was conducted at Boulder Creek, Colorado and...
Glacier variability in the conterminous United States during the twentieth century
Gregory J. McCabe, Andrew G. Fountain
2013, Climate Change (116) 565-577
Glaciers of the conterminous United States have been receding for the past century. Since 1900 the recession has varied from a 24 % loss in area (Mt. Rainier, Washington) to a 66 % loss in the Lewis Range of Montana. The rates of retreat are generally similar with a rapid loss in...
Effect of dissolved organic matter source and character on microbial Hg methylation in Hg–S–DOM solutions
Andrew M. Graham, George R. Aiken, Cynthia Gilmour
2013, Environmental Science & Technology (47) 5746-5754
Dissolved organic matter (DOM) is a key component of fate and transport models for most metals, including mercury (Hg). Utilizing a suite of diverse DOM isolates, we demonstrated that DOM character, in addition to concentration, influences inorganic Hg (Hg(II)i) bioavailability to Hg-methylating bacteria. Using a model Hg-methylating bacterium, Desulfovibrio desulfuricansND132, we...
Ambient seismic noise interferometry in Hawai'i reveals long-range observability of volcanic tremor
Silke Ballmer, Cecily J. Wolfe, Paul G. Okubo, Matthew M. Haney, Clifford H. Thurber
2013, Geophysical Journal International (194) 512-523
The use of seismic noise interferometry to retrieve Green's functions and the analysis of volcanic tremor are both useful in studying volcano dynamics. Whereas seismic noise interferometry allows long-range extraction of interpretable signals from a relatively weak noise wavefield, the characterization of volcanic tremor often requires a dense seismic array...
Seed harvesting is influenced by associational effects in mixed seed neighbourhoods, not just by seed density
Steven M. Ostoja, Eugene W. Schupp, Susan Durham, Robert C. Klinger
2013, Functional Ecology (27) 775-785
Rodents frequently forage in a density-dependent manner, increasing harvesting in patches with greater seed densities. Although seldom considered, seed harvesting may also depend on the species identities of other individuals in the seed neighbourhood. When the seed harvest of a focal species increases in association with another...
Rethinking infiltration in wildfire-affected soils
Brian A. Ebel, John A. Moody
2013, Hydrological Processes (27) 1510-1514
Wildfires frequently result in natural hazards such as flash floods (Yates et al., 2001) and debris flows (Cannon et al., 2001a,b; Gabet and Sternberg, 2008). One of the principal causes of the increased risk of post-wildfire hydrologically driven hazards is reduced in filtration rates (e.g. Scott and van Wyk, 1990;...
Transport and fate of microbial pathogens in agricultural settings
Scott A. Bradford, Veronica L. Morales, Wei Zhang, Ronald W. Harvey, Aaron I. Packman, Arvind Mohanram, Claire Welty
2013, Critical Reviews in Environmental Science and Technology (43) 775-893
An understanding of the transport and survival of microbial pathogens (pathogens hereafter) in agricultural settings is needed to assess the risk of pathogen contamination to water and food resources, and to develop control strategies and treatment options. However, many knowledge gaps still remain in predicting the fate and transport of...
Projecting the land cover change and its environmental impacts in the Cedar River Basin in the Midwestern United States
Yiping Wu, Shuguang Liu, Terry L. Sohl, Claudia Young
2013, Environmental Research Letters (8) 1-13
The physical surface of the Earth is in constant change due to climate forcing and human activities. In the Midwestern United States, urban area, farmland, and dedicated energy crop (e.g., switchgrass) cultivation are predicted to expand in the coming decades, which will lead to changes in hydrological processes. This study...
Knowledge, transparency, and refutability in groundwater models, an example from the Death Valley regional groundwater flow system
Mary C. Hill, Claudia C. Faunt, Wayne Belcher, Donald S. Sweetkind, Claire R. Tiedeman, Dmitri Kavetski
2013, Physics and Chemistry of the Earth, Parts A/B/C (64) 105-116
This work demonstrates how available knowledge can be used to build more transparent and refutable computer models of groundwater systems. The Death Valley regional groundwater flow system, which surrounds a proposed site for a high level nuclear waste repository of the United States of America, and the Nevada National Security...
Trends in landscape and vegetation change and implications for the Santa Cruz Watershed
Miguel L. Villarreal, Laura M. Norman, Robert H. Webb, Raymond M. Turner
2013, Book, Proceedings of the Science on the Sonoita Plain Symposium
Monitoring and characterizing the interactive effects of land use and climate on land surface processes is a primary focus of land change science, and of particular concern in arid Wells Distribution in Shallow Groundwater Areas Pumping Trends Increase Streamflow Extent Declines 27 environments where both landscapes and livelihoods can be...
Enhanced transfer of terrestrially derived carbon to the atmosphere in a flooding event
Thomas S. Bianchi, Fenix Garcia-Tigreros, Shari A. Yvon-Lewis, Michael Shields, Heath J. Mills, David Butman, Christopher Osburn, Peter A. Raymond, G. Christopher Shank, Steven F. DiMarco, Nan Walker, Brandi Kiel Reese, Ruth Mullins-Perry, Antonietta Quigg, George R. Aiken, Ethan L. Grossman
2013, Geophysical Research Letters (40) 116-122
Rising CO2 concentration in the atmosphere, global climate change, and the sustainability of the Earth's biosphere are great societal concerns for the 21st century. Global climate change has, in part, resulted in a higher frequency of flooding events, which allow for greater exchange between soil/plant litter and aquatic carbon pools. Here...
Making the case for the Picuris orogeny: Evidence for a 1500 to 1400 Ma orogenic event in the southwestern United States
Christopher G. Daniel, James V. Jones III, Christopher L. Andronicos, Mary Beth Gray
Lon D. Abbott, Gregory S. Hancock, editor(s)
2013, Book chapter, Classic concepts and new directions: Exploring 125 years of GSA discoveries in the Rocky Mountain region
The early Mesoproterozoic (ca. 1400 Ma) is an enigmatic time in the tectonic evolution of southern Laurentia. Circa 1400 Ma granites within Laurentia and multiple other continents have distinctive geochemistry consistent with crustal extension or mantle upwelling. In the southwestern United States, these granites are commonly foliated...
Use of gene-expression programming to estimate Manning’s roughness coefficient for high gradient streams
H. Azamathulla, Robert D. Jarrett
2013, Water Resources Management (27) 715-729
Manning’s roughness coefficient (n) has been widely used in the estimation of flood discharges or depths of flow in natural channels. Therefore, the selection of appropriate Manning’s nvalues is of paramount importance for hydraulic engineers and hydrologists and requires considerable experience, although extensive guidelines are available. Generally,...
Eighth Landsat satellite becomes operational
J. R. Irons, Thomas R. Loveland
2013, Photogrammetric Engineering and Remote Sensing (79) 398-401
No abstract available....
