Age and growth of round gobies in Lake Michigan, with preliminary mortality estimation
Bin Huo, Charles P. Madenjian, Cong X. Xie, Yingming Zhao, Timothy P. O’Brien, Sergiusz J. Czesny
2015, Journal of Great Lakes Research (40) 712-720
The round goby (Neogobius melanostomus) is a prevalent invasive species throughout Lake Michigan, as well as other Laurentian Great Lakes, yet little information is available on spatial variation in round goby growth within one body of water. Age and growth of round goby at three areas of Lake Michigan were...
Modeling long-term trends of chlorinated ethene contamination at a public supply well
Francis H. Chapelle, Leon J. Kauffman, Mark A. Widdowson
2015, Journal of the American Water Resources Association (51) 1-13
A mass-balance solute-transport modeling approach was used to investigate the effects of dense nonaqueous phase liquid (DNAPL) volume, composition, and generation of daughter products on simulated and measured long-term trends of chlorinated ethene (CE) concentrations at a public supply well. The model was built by telescoping a calibrated regional three-dimensional...
Predicted effects of future climate warming on thermal habitat suitability for Lake Sturgeon (Acipenser fulvescens, Rafinesque, 1817) in rivers in Wisconsin, USA
John D. Lyons, Jana S. Stewart
2015, Journal of Applied Ichthyology (30) 1508-1513
The Lake Sturgeon (Acipenser fulvescens, Rafinesque, 1817) may be threatened by future climate warming. The purpose of this study was to identify river reaches in Wisconsin, USA, where they might be vulnerable to warming water temperatures. In Wisconsin, A. fulvescens is known from 2291 km of large-river habitat that has...
Spatial complexity reduces interaction strengths in the meta-food web of a river floodplain mosaic
James Ryan Bellmore, Colden Vance Baxter, Patrick J. Connolly
2015, Ecology (96) 274-283
Theory states that both the spatial complexity of landscapes and the strength of interactions between consumers and their resources are important for maintaining biodiversity and the 'balance of nature.' Spatial complexity is hypothesized to promote biodiversity by reducing potential for competitive exclusion; whereas, models show weak trophic interactions can enhance...
Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species
Amy Y. Then, John M Hoenig, Norman G. Hall, David A. Hewitt
2015, ICES Journal of Marine Science (72) 82-92
Many methods have been developed in the last 70 years to predict the natural mortality rate, M, of a stock based on empirical evidence from comparative life history studies. These indirect or empirical methods are used in most stock assessments to (i) obtain estimates of M in the absence of direct information, (ii)...
The economic viability of smallholder timber production under expanding açaí palm production in the Amazon Estuary
Lucas B. Fortini, Douglas R. Carter
2015, Journal of Forest Economics (20) 223-235
Relatively little attention has been paid to the economic potentials and limitations of tropical timber production and management at smallholder scales, with the most relevant research focusing on community forestry efforts. As a rare tropical example of long-lasting small-scale timber production, in this study we explore the economics of smallholder...
Introduced northern pike consumption of salmonids in Southcentral Alaska
Adam Sepulveda, David S. Rutz, Aaron W Dupuis, Patrick A Shields, Kristine J. Dunker
2015, Ecology of Freshwater Fish (24) 519-531
The impacts of introduced northern pike (Esox lucius) on salmonid populations have attracted much attention because salmonids are popular subsistence, sport and commercial fish. Concern over the predatory effects of introduced pike on salmonids is especially high in Southcentral Alaska, where pike were illegally introduced to the Susitna River basin...
Mantle peridotite in newly discovered far-inland subduction complex, southwest Arizona: Initial report
Gordon B. Haxel, Carl E. Jacobson, James H. Wittke
2015, International Geology Review (57) 871-892
The latest Cretaceous to early Palaeogene Orocopia Schist and related units are generally considered a low-angle subduction complex that underlies much of southern California and Arizona. A recently discovered exposure of Orocopia Schist at Cemetery Ridge west of Phoenix, Arizona, lies exceptionally far inland from the continental margin. Unexpectedly, this...
Event sedimentation in low-latitude deep-water carbonate basins, Anegada passage, northeast Caribbean
Jason D. Chaytor, Uri S. ten Brink
2015, Basin Research (27) 310-335
The Virgin Islands and Whiting basins in the Northeast Caribbean are deep, structurally controlled depocentres partially bound by shallow-water carbonate platforms. Closed basins such as these are thought to document earthquake and hurricane events through the accumulation of event layers such as debris flow and turbidity current deposits and the...
Indirect effects of biocontrol of an invasive riparian plant (Tamarix) alters habitat and reduces herpetofauna abundance
H.L. Bateman, D.M. Merritt, E. P. Glenn, P.L. Nagler
2015, Biological Invasions (17) 87-97
The biological control agent (tamarisk leaf beetle, Diorhabda spp.) is actively being used to defoliate exotic saltcedar or tamarisk (Tamarix spp.) in riparian ecosystems in western USA. The Virgin River in Arizona and Nevada is a system where tamarisk leaf beetle populations are spreading. Saltcedar biocontrol, like other control methods,...
Models of invasion and establishment of African Mustard (Brassica tournefortii)
Kristin H. Berry, Timothy A. Gowan, David M. Miller, Matthew L. Brooks
2015, Invasive Plant Science and Management (7) 599-616
Introduced exotic plants can drive ecosystem change. We studied invasion and establishment ofBrassica tournefortii (African mustard), a noxious weed, in the Chemehuevi Valley, western Sonoran Desert, California. We used long-term data sets of photographs, transects for biomass of annual plants, and densities of African mustard collected at irregular intervals between 1979...
Hydrologic response to valley-scale structure in alpine headwaters
Anne A. Weekes, Christian E. Torgersen, David R. Montgomery, Andrea Woodward, Susan M. Bolton
2015, Hydrological Processes (29) 356-372
Few systematic studies of valley-scale geomorphic drivers of streamflow regimes in complex alpine headwaters have compared response between catchments. As a result, little guidance is available for regional-scale hydrological research and monitoring efforts that include assessments of ecosystem function. Physical parameters such as slope, elevation range, drainage area and bedrock...
New insight into the spawning behavior of lake trout, Salvelinus namaycush, from a recovering population in the Laurentian Great Lakes
Thomas R. Binder, Henry T. Thompson, Andrew M. Muir, Stephen C. Riley, J. Ellen Marsden, Charles R. Bronte, Charles C. Krueger
2015, Environmental Biology of Fishes (98) 173-181
Spawning behavior of lake trout, Salvelinus namaycush, is poorly understood, relative to stream-dwelling salmonines. Underwater video records of spawning in a recovering population from the Drummond Island Refuge (Lake Huron) represent the first reported direct observations of lake trout spawning in the Laurentian Great Lakes. These observations provide...
High-resolution paleoclimatology of the Santa Barbara Basin during the Medieval Climate Anomaly and early Little Ice Age based on diatom and silicoflagellate assemblages in Kasten core SPR0901-02KC
John A. Barron, David B. Bukry, Ingrid L. Hendy
2015, Quaternary International (387) 13-22
Diatom and silicoflagellate assemblages documented in a high-resolution time series spanning 800 to 1600 AD in varved sediment recovered in Kasten core SPR0901-02KC (34°16.845’ N, 120°02.332’ W, water depth 588 m) from the Santa Barbara Basin (SBB) reveal that SBB surface water conditions during the Medieval Climate Anomaly (MCA) and...
Change in agricultural land use constrains adaptation of national wildlife refuges to climate change
Christopher M. Hamilton, Wayne E. Thogmartin, Volker C. Radeloff, Andrew J. Plantinga, Patricia J. Heglund, Sebastian Martinuzzi, Anna M. Pidgeon
2015, Environmental Conservation (42) 12-19
Land-use change around protected areas limits their ability to conserve biodiversity by altering ecological processes such as natural hydrologic and disturbance regimes, facilitating species invasions, and interfering with dispersal of organisms. This paper informs USA National Wildlife Refuge System conservation planning by predicting future land-use change on lands within 25...
Real-time inversions for finite fault slip models and rupture geometry based on high-rate GPS data
Sarah E. Minson, Jessica R. Murray, John O. Langbein, Joan S. Gomberg
2015, Journal of Geophysical Research (119) 3201-3231
We present an inversion strategy capable of using real-time high-rate GPS data to simultaneously solve for a distributed slip model and fault geometry in real time as a rupture unfolds. We employ Bayesian inference to find the optimal fault geometry and the distribution of possible slip models for that geometry...
Simulation of water-table aquifers using specified saturated thickness
Rodney A. Sheets, Mary C. Hill, Henk M. Haitjema, Alden M. Provost, John P. Masterson
2015, Ground Water (53) 151-157
Simulating groundwater flow in a water-table (unconfined) aquifer can be difficult because the saturated thickness available for flow depends on model-calculated hydraulic heads. It is often possible to realize substantial time savings and still obtain accurate head and flow solutions by specifying an approximate saturated thickness a priori, thus linearizing...
Assessing stand water use in four coastal wetland forests using sapflow techniques: annual estimates, errors and associated uncertainties
Ken W. Krauss, Jamie A. Duberstein, William H. Conner
2015, Hydrological Processes (29) 112-127
Forests comprise approximately 37% of the terrestrial land surface and influence global water cycling. However, very little attention has been directed towards understanding environmental impacts on stand water use (S) or in identifying rates of S from specific forested wetlands. Here, we use sapflow techniques to address two separate but linked objectives:...
Hydrogeologic characterization and assessment of bioremediation of chlorinated benzenes and benzene in wetland areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009-12
Michelle M. Lorah, Charles W. Walker, Anna C. Baker, Jessica A. Teunis, Emily Majcher, Michael J. Brayton, Jeff P. Raffensperger, Isabelle M. Cozzarelli
2015, Scientific Investigations Report 2014-5140
Wetlands at the Standard Chlorine of Delaware, Inc. Superfund Site (SCD) in New Castle County, Delaware, are affected by contamination with chlorobenzenes and benzene from past waste storage and disposal, spills, leaks, and contaminated groundwater discharge. In cooperation with the U.S. Environmental Protection Agency, the U.S. Geological Survey began an...
Quantifying climate change mitigation potential in Great Plains wetlands for three greenhouse gas emission scenarios
Kristin B. Byrd, Jamie L. Ratliff, Anne Wein, Norman B. Bliss, Benjamin M. Sleeter, Terry L. Sohl, Zhengpeng Li
2015, Mitigation and Adaptation Strategies for Global Change (20) 439-465
We examined opportunities for avoided loss of wetland carbon stocks in the Great Plains of the United States in the context of future agricultural expansion through analysis of land-use land-cover (LULC) change scenarios, baseline carbon datasets and biogeochemical model outputs. A wetland map that classifies wetlands according to carbon pools...
A spaceborne inventory of volcanic activity in Antarctica and southern oceans, 2000-10
Matthew R. Patrick, John L. Smellie
2015, Antarctic Science (25) 475-500
Of the more than twenty historically active volcanoes in Antarctica and the sub-Antarctic region only two, to our knowledge, host any ground-based monitoring instruments. Moreover, because of their remoteness, most of the volcanoes are seldom visited, thus relegating the monitoring of volcanism in this region almost entirely to satellites. In...
The use of wavenumber normalization in computing spatially averaged coherencies (KRSPAC) of microtremor data from asymmetric arrays
M.W. Asten, William J. Stephenson, Stephen H. Hartzell
2015, Conference Paper
The SPAC method of processing microtremor noise observations for estimation of Vs profiles has a limitation that the array has circular or triangular symmetry in order to allow spatial (azimuthal) averaging of inter-station coherencies over a constant station separation. Common processing methods allow for station separations to vary by typically...
Estimating evapotranspiration and groundwater flow from water-table fluctuations for a general wetland scenario
Martha L. Carlson Mazur, Michael J. Wiley, Douglas A. Wilcox
2015, Ecohydrology (7) 378-390
The use of diurnal water-table fluctuation methods to calculate evapotranspiration (ET) and groundwater flow is of increasing interest in ecohydrological studies. Most studies of this type, however, have been located in riparian wetlands of semi-arid regions where groundwater levels are consistently below topographic surface elevations and precipitation events are infrequent....
Pathologic and physiologic effects associated with long-term intracoelomic transmitters in captive Siberian sturgeon
S. Shaun Boone, Stephen J. Divers, Alvin C. Camus, Douglas C. Peterson, Cecil A. Jennings, James L. Shelton, Sonia M. Hernandez
2015, North American Journal of Fisheries Management (33) 869-877
Intracoelomic transmitters are commonly used to evaluate migratory patterns, distribution, and habitat use of many species of fish. Currently, transmitter implantation relies mostly on the assumption that transmitters do not cause any adverse physiological or pathological effects on the animal. To investigate these effects, we surgically implanted 60 Siberian Sturgeon...
Sequence stratigraphic framework of upper pliocene to holocene sediments of the Los Angeles Basin, California: Implications for aquifer architecture
Kenneth D. Ehman, Brian D. Edwards, Daniel J. Ponti
2015, Book
Executive Summary Groundwater provides more than one-third of the municipal water supply for the coastal Los Angeles Basin and defining the aquifer architecture is a high priority for ground-water managers. Sequence stratigraphy, the state-of-the-art method for delineating reservoir geometry and continuity in the petroleum industry, is now being incorporated into ground water...
