Hydrothermal vents and methane seeps: Rethinking the sphere of influence
Lisa A. Levin, Amy Baco, David Bowden, Ana Colaco, Erik E. Cordes, Marina Cunha, Amanda W.J. Demopoulos, Judith Gobin, Ben Grupe, Jennifer Le, Anna Metaxas, Amanda Netburn, Greg Rouse, Andrew Thurber, Verena Tunnicliffe, Cindy L. Van Dover, Ann Vanreusel, Les Watling
2016, Frontiers in Marine Science (3)
Although initially viewed as oases within a barren deep ocean, hydrothermal vent and methane seep communities are now recognized to interact with surrounding ecosystems on the sea floor and in the water column, and to affect global geochemical cycles. The importance of understanding these interactions is growing as the potential...
Vegetation of semi-stable rangeland dunes of the Navajo Nation, Southwestern USA
Kathryn A. Thomas, Margaret H. Redsteer
2016, Arid Land Research and Management (30) 400-411
Dune destabilization and increased mobility is a worldwide issue causing ecological, economic, and health problems for the inhabitants of areas with extensive dune fields. Dunes cover nearly a third of the Navajo Nation within the Colorado Plateau of southwestern USA. There, higher temperatures and prolonged drought beginning in 1996 have...
Drivers of barotropic and baroclinic exchange through an estuarine navigation channel in the Mississippi River Delta Plain
Gregg Snedden
2016, Water (8)
Estuarine navigation channels have long been recognized as conduits for saltwater intrusion into coastal wetlands. Salt flux decomposition and time series measurements of velocity and salinity were used to examine salt flux components and drivers of baroclinic and barotropic exchange in the Houma Navigation Channel, an estuarine channel located in...
Spatially explicit control of invasive species using a reaction-diffusion model
Mathieu Bonneau, Fred A. Johnson, Christina M. Romagosa
2016, Ecological Modelling (337) 15-24
Invasive species, which can be responsible for severe economic and environmental damages, must often be managed over a wide area with limited resources, and the optimal allocation of effort in space and time can be challenging. If the spatial range of the invasive species is large, control actions might be...
Trace elements in stormflow, ash, and burned soil following the 2009 station fire in southern California
Carmen A. Burton, Todd M. Hoefen, Geoffrey S. Plumlee, Katherine L. Baumberger, Adam R. Backlin, Elizabeth Gallegos, Robert N. Fisher
2016, PLoS ONE (11) e0153372
Most research on the effects of wildfires on stream water quality has focused on suspended sediment and nutrients in streams and water bodies, and relatively little research has examined the effects of wildfires on trace elements. The purpose of this study was two-fold: 1) to determine the effect of the...
Simulation of deep ventilation in Crater Lake, Oregon, 1951–2099
Tamara M. Wood, Susan A. Wherry, Sebastiano Piccolroaz, Scott F Girdner
2016, Scientific Investigations Report 2016-5046
The frequency of deep ventilation events in Crater Lake, a caldera lake in the Oregon Cascade Mountains, was simulated in six future climate scenarios, using a 1-dimensional deep ventilation model (1DDV) that was developed to simulate the ventilation of deep water initiated by reverse stratification and subsequent thermobaric instability. The...
Pesticide concentrations in wetlands on the Lake Traverse Indian Reservation, South and North Dakota, July 2015
Janet M. Carter, Ryan F. Thompson
2016, Data Series 984
During July 2015, water samples were collected from 18 wetlands on the Lake Traverse Indian Reservation in northeastern South Dakota and southeastern North Dakota and analyzed for physical properties and 54 pesticides. This study by the U.S. Geological Survey in cooperation with the Sisseton-Wahpeton Oyate was designed to provide an...
Mapping rice-fallow cropland areas for short-season grain legumes intensification in South Asia using MODIS 250 m time-series data
Murali Krishna Gumma, Prasad S. Thenkabail, Pardhasaradhi G. Teluguntla, Mahesh N. Rao, Irshad A. Mohammed, Anthony M. Whitbread
2016, International Journal of Digital Earth (9) 981-1003
The goal of this study was to map rainfed and irrigated rice-fallow cropland areas across South Asia, using MODIS 250 m time-series data and identify where the farming system may be intensified by the inclusion of a short-season crop during the fallow period. Rice-fallow cropland areas are those areas where rice...
Long-term trends in a Dimictic Lake
Dale M. Robertson, Yi-Fang Hsieh, Richard C Lathrop, Chin H Wu, Madeline Magee, David P. Hamilton
2016, Hydrology and Earth System Sciences (20) 1681-1702
The one-dimensional hydrodynamic ice model, DYRESM-WQ-I, was modified to simulate ice cover and thermal structure of dimictic Lake Mendota, Wisconsin, USA, over a continuous 104-year period (1911–2014). The model results were then used to examine the drivers of changes in ice cover and water temperature, focusing on the responses...
Effect of diet quality on chronic toxicity of aqueous lead to the amphipod Hyalella azteca
John M. Besser, Chris D. Ivey, William G. Brumbaugh, Christopher G. Ingersoll
2016, Environmental Toxicology and Chemistry (35) 1825-1834
The authors investigated the chronic toxicity of aqueous Pb to the amphipod Hyalella azteca (Hyalella) in 42-d tests using 2 different diets: 1) the yeastþcereal leafþtrout pellet (YCT) diet, fed at the uniform low ration used in standard methods for sediment toxicity tests; and 2) a new diet of diatomsþTetraMin...
Molecular evidence of undescribed Ceratonova sp. (Cnidaria: Myxosporea) in the freshwater polychaete, Manayunkia speciosa, from western Lake Erie
David M. Malakauskas, Robert Benjamin Snipes, Ann M. Thompson, Donald W. Schloesser
2016, Journal of Invertebrate Pathology (137) 49-53
We used PCR to screen pooled individuals of Manayunkia speciosa from western Lake Erie, Michigan, USA for myxosporean parasites. Amplicons from positive PCRs were sequenced and showed a Ceratonova species in an estimated 1.1% (95% CI = 0.46%, 1.8%) of M. speciosa individuals. We sequenced 18S, ITS1, 5.8S, ITS2 and most of the 28S rDNA regions of...
Practical bias correction in aerial surveys of large mammals: Validation of hybrid double-observer with sightability method against known abundance of feral horse (Equus caballus) populations
Bruce C. Lubow, Jason I. Ransom
Kathryn A. Schoenecker, editor(s)
2016, PLoS ONE (11)
Reliably estimating wildlife abundance is fundamental to effective management. Aerial surveys are one of the only spatially robust tools for estimating large mammal populations, but statistical sampling methods are required to address detection biases that affect accuracy and precision of the estimates. Although various methods for correcting aerial survey bias...
Improve wildlife species tracking—Implementing an enhanced global positioning system data management system for California condors
Robert G. Waltermire, Christopher U. Emmerich, Laura C. Mendenhall, Gil Bohrer, Rolf P. Weinzierl, Andrew J. McGann, Pat K. Lineback, Tim J. Kern, David C. Douglas
2016, Open-File Report 2016-1030
U.S. Fish and Wildlife Service (USFWS) staff in the Pacific Southwest Region and at the Hopper Mountain National Wildlife Refuge Complex requested technical assistance to improve their global positioning system (GPS) data acquisition, management, and archive in support of the California Condor Recovery Program. The USFWS deployed and maintained GPS...
Geologic history of the Blackbird Co-Cu district in the Lemhi subbasin of the Belt-Purcell Basin
Arthur A. Bookstrom, Stephen E. Box, Pamela M. Cossette, Thomas P. Frost, Virginia Gillerman, George King, N. Alex Zirakparvar
2016, GSA Special Papers (522) 185-219
The Blackbird cobalt-copper (Co-Cu) district in the Salmon River Mountains of east-central Idaho occupies the central part of the Idaho cobalt belt—a northwest-elongate, 55-km-long belt of Co-Cu occurrences, hosted in grayish siliciclastic metasedimentary strata of the Lemhi subbasin (of the Mesoproterozoic Belt-Purcell Basin). The Blackbird district contains at least...
Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013
J.P. Calzia, O.T. Ramo, Robert Jachens, Eugene Smith, Jeffrey Knott
2016, Open-File Report 2016-1064
Much has been written about the age and formation of Death Valley, but that is one—if not the last—chapter in the fascinating geologic history of this area. Igneous and sedimentary rocks in the Greenwater Range, one mountain range east of Death Valley, tell an earlier story that overlaps with the...
Flow management for hydropower extirpates aquatic insects, undermining river food webs
Theodore A. Kennedy, Jeffrey D. Muehlbauer, Charles B. Yackulic, D.A. Lytle, S.A. Miller, Kimberly L. Dibble, Eric W. Kortenhoeven, Anya N. Metcalfe, Colden V. Baxter
2016, BioScience (66) 561-575
Dams impound the majority of rivers and provide important societal benefits, especially daily water releases that enable on-peak hydroelectricity generation. Such “hydropeaking” is common worldwide, but its downstream impacts remain unclear. We evaluated the response of aquatic insects, a cornerstone of river food webs, to hydropeaking using a life history–hydrodynamic...
Timing and composition of continental volcanism at Harrat Hutaymah, western Saudi Arabia
Robert A. Duncan, Adam J R Kent, Carl Thornber, Tyler D Schliedler, Abdullah M Al-Amri
2016, Journal of Volcanology and Geothermal Research (313) 1-14
Harrat Hutaymah is an alkali basalt volcanic field in north-central Saudi Arabia, at the eastern margin of a large Neogene continental, intraplate magmatic province. Lava flow, tephra and spatter cone compositions in the field include alkali olivine basalts and basanites. These compositions contrast with the predominantly tholeiitic, fissure-fed basalts found...
Hydrologic exchanges and baldcypress water use on deltaic hummocks, Louisiana, USA
Yu-Hsin Hsueh, Jim L. Chambers, Ken W. Krauss, Scott T. Allen, Richard F. Keim
2016, Ecohydrology (9) 1452-1463
Coastal forested hummocks support clusters of trees in the saltwater–freshwater transition zone. To examine how hummocks support trees in mesohaline sites that are beyond physiological limits of the trees, we used salinity and stable isotopes (2H and 18O) of water as tracers to understand water fluxes in hummocks and uptake...
Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding whooping cranes (Grus americana)
Megan E. Brown, Sarah J. Converse, Jane N. Chandler, Charles Shafer, Janine L Brown, Carol L Keefer, Nucharin Songsasen
2016, General and Comparative Endocrinology (230-231) 158-165
Reproductive success of endangered whooping cranes (Grus americana) maintained ex situ is poor. As part of an effort to identify potential causes of poor reproductive success in a captive colony, we used non-invasive endocrine monitoring to assess gonadal and adrenal steroids of bird pairs with various reproductive outcomes and evaluated the relationships...
Geology of tight oil and potential tight oil reservoirs in the lower part of the Green River Formation, Uinta, Piceance, and Greater Green River Basins, Utah, Colorado, and Wyoming
Ronald C. Johnson, Justin E. Birdwell, Tracey J. Mercier, Michael E. Brownfield
2016, Scientific Investigations Report 2016-5008
The recent successful development of a tight oil play in the Eocene-age informal Uteland Butte member of the lacustrine Green River Formation in the Uinta Basin, Utah, using modern horizontal drilling and hydraulic fracturing techniques has spurred a renewed interest in the tight oil potential of lacustrine rocks. The Green...
Geologic and geochemical insights into the formation of the Taiyangshan porphyry copper–molybdenum deposit, Western Qinling Orogenic Belt, China
Kun-Feng Qiu, Ryan D. Taylor, Yao-Hui Song, Hao-Cheng Yu, Kai-Rui Song, Nan Li
2016, Gondwana Research (35) 40-58
Taiyangshan is a poorly studied copper–molybdenum deposit located in the Triassic Western Qinling collisional belt of northwest China. The intrusions exposed in the vicinity of the Taiyangshan deposit record episodic magmatism over 20–30 million years. Pre-mineralization quartz diorite porphyries, which host some of the deposit, were emplaced at 226.6 ± 6.2 Ma. Syn-collisional monzonite and...
A millennial-scale record of Pb and Hg contamination in peatlands of the Sacramento-San Joaquin Delta of California, USA
Judith Z. Drexler, Charles N. Alpers, Leonid A. Neymark, James B. Paces, Howard E. Taylor, Christopher C. Fuller
2016, Science of the Total Environment (551-552) 738-751
In this paper, we provide the first record of millennial patterns of Pb and Hg concentrations on the west coast of the United States. Peat cores were collected from two micro-tidal marshes in the Sacramento-San Joaquin Delta of California. Core samples were analyzed for Pb, Hg, and Ti concentrations and...
Spectrally based mapping of riverbed composition
Carl J. Legleiter, Tobin K. Stegman, Brandon T. Overstreet
2016, Geomorphology (264) 61-79
Remote sensing methods provide an efficient means of characterizing fluvial systems. This study evaluated the potential to map riverbed composition based on in situ and/or remote measurements of reflectance. Field spectra and substrate photos from the Snake River, Wyoming, USA, were used to identify different sediment facies and degrees of algal development...
Developing population models with data from marked individuals
Hae Yeong Ryu, Kevin T. Shoemaker, Eva Kneip, Anna Pidgeon, Patricia Heglund, Brooke Bateman, Wayne E. Thogmartin, Resit Akcakaya
2016, Biological Conservation (197) 190-199
Population viability analysis (PVA) is a powerful tool for biodiversity assessments, but its use has been limited because of the requirements for fully specified population models such as demographic structure, density-dependence, environmental stochasticity, and specification of uncertainties. Developing a fully specified population model from commonly available data sources – notably,...
Kīlauea Point National Wildlife Refuge comprehensive conservation plan
Catherine M. Cullinane Thomas, Lynne Koontz
2016, Report
No abstract available....
