Long-term Mississippi River trends expose shifts in the river load response to watershed nutrient balances between 1975 and 2017
Sarah M. Stackpoole, Robert D. Sabo, James A. Falcone, Lori A. Sprague
2021, Water Resources Research (57)
Excess nutrients transported by the Mississippi River (MR) contribute to hypoxia in the Gulf of Mexico. Nutrient balances are key drivers to river nutrient loads and represent inputs (fertilizer, manure, deposition, wastewater, N-fixation, and weathering) minus outputs (nutrient uptake and removal in harvest, and N emissions)....
Small shorebirds feast on green slime to fuel their long migration
Laurie Anne Hall, Susan E.W. De La Cruz, Isa Woo, Tomohiro Kuwae, David Mcgovern Nelson, John Y. Takekawa
2021, Frontiers for Young Minds (9)
Shorebirds wade in shallow waters along shorelines searching for food. More than a million shorebirds visit the San Francisco Estuary each year during their migration to feast on the insects, worms, clams, and crabs that live on or under the surface of the sand or mud. The abundant food...
Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
Jeffrey S. Honke, Jeffrey S. Pigati, J. Michael Daniels
2021, Arctic, Antarctic, and Alpine Research (53) 252-268
The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain glacial chronologies because the...
The Denver Well Logging Society November 2021 Newsletter: From the VP - Technology
Jenny H. Lagesse
2021, Newsletter
No abstract available....
Causes, consequences, and conservation of ungulate migration
Matthew J. Kauffman, Ellen O. Aikens, Saeideh Esmaeili, Petra Kaczensky, Arthur Middleton, Kevin L. Monteith, Thomas A. Morrison, Thomas Mueller, Hall Sawyer, Jacob R. Goheen
2021, Annual Review of Ecology, Evolution, and Systematics (52) 453-478
Our understanding of ungulate migration is advancing rapidly due to innovations in modern animal tracking. Herein, we review and synthesize nearly seven decades of work on migration and other long-distance movements of wild ungulates. Although it has long been appreciated that ungulates migrate to enhance access to forage, recent contributions...
Were humans and mammoths on the Channel Islands at the same time?
Daniel R. Muhs
2021, Book chapter, Islands through time: A human and ecological history of California's northern Channel Islands
No abstract available....
Environmental DNA surveys of Burmese pythons in the Greater Everglades Ecosystem
Caitlin E. Beaver, Gaia Meigs-Friend, Margaret E. Hunter
2021, Open-File Report 2021-1082
Improving the probability of detecting invasive giant snakes is vital for the management of emerging or established populations. Burmese pythons occupy thousands of square kilometers of mostly inaccessible habitats in Florida. Environmental DNA (eDNA) methods have been shown to be time and cost effective in a number of systems...
Nine-banded armadillo (Dasyrus novemcinctus) activity patterns are influenced by human activity
Brett Alexander DeGregorio, C. Gale, E. V. Lassiter, A. Massey, Caleb Powell Roberts, J. Veon
2021, Ecology and Evolution (11) 15874-15881
As the human footprint upon the landscape expands, wildlife seeking to avoid human contact are losing the option of altering their spatial distribution and instead are shifting their daily activity patterns to be active at different times than humans. In this study, we used game cameras to evaluate how human...
Mapping multivariate ore occurrence data with correspondence analysis
Joshua Mark Rosera
2021, Conference Paper, Abstract proceedings: Mineral prospectivity and exploration targeting – MinProXT 2021 webinar
Correspondence analysis is a multivariate method that can be applied to mineral abundance data. Ore mineral assemblages from broadly underutilized prospect and occurrence data can be treated as geochemical anomalies, projected to low-dimensional space, and returned into map view. This approach could have applications for mineral prospectivity mapping...
PlioMIP: The Pliocene Model Intercomparison Project
A. M. Haywood, Harry J. Dowsett, PlioMIP1 and PlioMIP2 participants
2021, Past Global Changes Magazine (29) 92-93
PlioMIP is a network of paleoclimate modelers and geoscientists who, through the study of the mid-Pliocene Warm Period (mPWP ~3.3–3.0 million years ago), seek to understand the sensitivity of the climate system to forcings and examine how well models reproduce past climate change....
Movement dynamics and survival of stocked Colorado River Cutthroat Trout
Alex G. LeCheminant, Gabriel M. Barrile, Shannon E. Albeke, Annika W. Walters
2021, Transactions of the American Fisheries Society (150) 679-693
The ability of native fish to establish self-sustaining populations when reintroduced to vacant habitats is variable. We evaluated factors that potentially affect the reintroduction success of juvenile Colorado River Cutthroat Trout Oncorhynchus clarkii pleuriticus that were reintroduced to an isolated watershed and were experiencing suboptimal survival and recruitment. We conducted a 3-year...
Appendix E: Mars nomenclature
Tenielle Gaither
2021, Book chapter, Discovering Mars
This appendix provides an overview of the history and current standards for Mars geographic nomenclature. The article describes the International Astronomical Union's approval process for planetary nomenclature, and discusses the role of USGS Astrogeology in managing the Gazetteer of Planetary Nomenclature website and background database and...
Species invasion progressively disrupts the trophic structure of native food webs
Charles Wainright, Clint C. Muhlfeld, James J. Elser, Samuel Bourret, Shawn P. Devlin
2021, Proceedings of the National Academy of Sciences (118)
Species invasions can have substantial impacts on native species and ecosystems, with important consequences for biodiversity. How these disturbances drive changes in the trophic structure of native food webs through time is poorly understood. Here, we quantify trophic disruption in freshwater food webs to invasion by an apex fish predator,...
Diet composition of the African manatee: Spatial and temporal variation within the Sanaga River Watershed, Cameroon
Aristide Takoukam Kamla, Dylan G. E. Gomes, Cathy Beck, Lucy W. Keith-Diagne, Margaret Hunter, Ruth Francis-Floyd, Robert K. Bonde
2021, Ecology and Evolution (11) 15833-15845
The present study aimed to investigate the diet of African manatees in Cameroon to better inform conservation decisions within protected areas. A large knowledge gap on diet and seasonal changes in forage availability limits the ability to develop informed local management plans for the African manatee in much of its...
Postcards from the field
G. Lynn Wingard
2021, Newsletter
My research focuses on pre-20th century conditions in the Greater Everglades Ecosystem of south Florida to provide the context for resource managers to set targets for restoration. A primary goal of Everglades restoration is to re-establish more natural delivery of freshwater to the wetlands and estuaries in the region....
Genetic attributes and research interests
Elizabeth P Flesch, Tabitha A. Graves, Robert A. Garrott, Sarah Dewey, Carson Butler
P J White, Robert A. Garrott, Douglas E. McWhirter, editor(s)
2021, Book chapter, Greater Yellowstone's mountain ungulates: A contrast in management histories and challenges
No abstract available....
Growth of the wildland-urban interface within and around U.S. National Forests and Grasslands, 1990-2010
Miranda H. Mockrin, Dave Helmers, Sebastian Martinuzzi, Todd Hawbaker, Volker C. Radeloff
2021, Landscape and Urban Planning (218)
The wildland-urban interface (WUI), where housing is in close proximity to or intermingled with wildland vegetation, is widespread throughout the United States, but it is unclear how this type of housing development affects public lands. We used a national dataset to examine WUI distribution and growth (1990–2010) in proximity to...
Numerical simulation of the boundary layer flow generated in Monterey Bay, California by the 2010 Chilean tsunami: Case study
Athanasios Makris, Jessica R. Lacy, David R. Fuhrman
2021, Journal of Waterway, Port, Coastal, and Ocean Engineering (147)
This work presents a case study involving the numerical simulation of the unsteady boundary layer generated by the 2010 Chilean tsunami, as measured by field equipment in Monterey Bay, California, USA. A one-dimensional vertical (1DV) boundary layer model is utilized, solving Reynolds-averaged Navier–Stokes equations, coupled with two-equation k–ω turbulence closure. Local effects...
The AEMON-J “Hacking Limnology” workshop series & virtual summit: Incorporating data science and open science in aquatic research
Michael F. Meyer, Robert Ladwig, Jorrit Mesman, Isabella Oleksy, Carolina C. Barbosa, Kaelin M. Cawley, Alli N. Cramer, Johannes Feldbauer, Patricia Q. Tran, Jacob Aaron Zwart, Gregario A. Lopez Moreira, Muhammed Shikhani, Deviyani Gurung, Robert T. Hensley, Elena Matta, Ryan P. McClure, Thomas Petzoldt, Nuria Sanchez Lopez, Karline Soetaert, Mridul K. Thomas, Simon Nemer Topp, Xiao Yang
2021, Limnology and Oceanography Bulletin (30) 140-143
Following the 2020 “Virtual Summit: Incorporating Data Science and Open Science in Aquatic Research” (DSOS; Meyer and Zwart 2020), a grassroots group of scientists convened the 2nd Virtual DSOS Summit on 22–23 July 2021. DSOS combined forces with the Aquatic Ecosystem MOdeling Network - Junior (AEMON-J; https://github.com/aemon-j) to host a 4-d “Hacking...
Potential effects of climate change on tick-borne diseases in Rhode Island
Howard Ginsberg, Jannelle Couret, Jason Garrett, Thomas N. Mather, Roger A. LeBrun
2021, Rhode Island Medical Journal (104) 29-33
Human cases of tick-borne diseases have been increasing in the United States. In particular, the incidence of Lyme disease, the major vector-borne disease in Rhode Island, has risen, along with cases of babesiosis and anaplasmosis, all vectored by the blacklegged tick. These increases might relate, in part, to climate change,...
Synthesis of data and studies relating to Delta Smelt biology in the San Francisco Estuary, emphasizing water year 2017
Shawn Acuna, Randy Baxter, Aaron J. Bever, Larry R. Brown, Christina Burdi, Gonzalo Castillo, Louise Conrad, Steven Culberson, Lauren Damon, Jared Frantzich, Lenny Grimaldo, Bruce Hammock, April Hennessy, James A. Hobbs, Shruti Khanna, Peggy W. Lehman, Michael L. MacWilliams, Brian Mahardja, Andrew A. Schultz, Steven B. Slater, Ted Sommer, Swee Teh, Janet Thompson
2021, Interagency Ecological Program Technical Report 95
In the San Francisco Estuary (SFE), the effects of freshwater flow on the aquatic ecosystem have been studied extensively over the years and remains a contentious management issue. It is especially contentious with regards to the Delta Smelt (Hypomesus transpacificus), a species endemic to the SFE that has been listed...
Realizations
C. Ozgen Karacan
2021, Book chapter, Encyclopedia of Mathematical Geosciences
In statistics, a realization is an observed value of a random variable (Gubner 2006). In mathematical geology, the most important realizations are those in the form of maps of spatially correlated regionalized variables.Spatial description of random variables within complex domains...
Enhancing marsh elevation using sediment augmentation: A case study from southern California, USA
Evyan Borgnis Sloane, Karen M. Thorne, Christine R Whitcraft, Victoria Touchstone
2021, Shore & Beach (89)
Tidal marshes are an important component of estuaries that provide habitat for fish and wildlife, protection from flooding, recreation opportunities, and can improve water quality. Critical to maintaining these functions is vertical accretion, a key mechanism by which tidal marshes...
Chesapeake Bay: A case study in resiliency and restoration
Richard R Arnold, William C. Dennison, Louis A. Etgen, Peter Goodwin, Michael Paolisso, Gary W. Shenk, Ann Swanson, Nguyen Vargas
2021, Hydrolink (1) 25-28
Chesapeake Bay (“mother of waters” or the “great shellfish Bay” in Algonquin), is the largest estuary in the United States and arguably the best studied estuary in the world. Chesapeake Bay is immense, with the main stem stretching 200 nautical miles (315 km) from the mouth of the Susquehanna River...
Geoelectric survey of the Granite Gravel aquifer, Llano Uplift, Central Texas, to determine locations for water wells
Scott Ikard, David S. Wallace, Andrew Teeple, Gregory Stanton
2021, Journal of Applied Geophysics (195)
An electrical geophysical survey was completed within a small area of the Llano Uplift of central Texas to determine locations to install two water wells in the Granite Gravel aquifer (GGA). Electrical resistivity tomography (ERT) was performed along two 188-m long...
