Hillslope response to knickpoint migration in the Southern Appalachians: Implications for the evolution of post-orogenic landscapes
S.F.G. Wegmann, K.L. Franke, S. Hughes, R.Q. Lewis, N. Lyons, P. Paris, K. Ross, J.B. Bauer, A.C. Witt
2011, Earth Surface Processes and Landforms (36) 1254-1267
The southern Appalachians represent a landscape characterized by locally high topographic relief, steep slopes, and frequent mass movement in the absence of significant tectonic forcing for at least the last 200 Ma. The fundamental processes responsible for landscape evolution in a post‐orogenic landscape remain enigmatic. The non‐glaciated Cullasaja River basin of...
Alaska North Slope regional gas hydrate production modeling forecasts
S.J. Wilson, R.B. Hunter, Timothy S. Collett, S. Hancock, R. Boswell, B.J. Anderson
2011, Marine and Petroleum Geology (28) 460-477
A series of gas hydrate development scenarios were created to assess the range of outcomes predicted for the possible development of the “Eileen” gas hydrate accumulation, North Slope, Alaska. Production forecasts for the “reference case” were built using the 2002 Mallik production tests, mechanistic simulation, and geologic studies conducted...
Planktivory in the changing Lake Huron zooplankton community: Bythotrephes consumption exceeds that of Mysis and fish
D.B. Bunnell, R. Douglas Hunter, D.M. Warner, M.A. Chriscinske, E.F. Roseman
2011, Freshwater Biology (56) 1281-1296
Oligotrophic lakes are generally dominated by calanoid copepods because of their competitive advantage over cladocerans at low prey densities. Planktivory also can alter zooplankton community structure. We sought to understand the role of planktivory in driving recent changes to the zooplankton community of Lake Huron, a large oligotrophic lake on...
Polar bear population status in the northern Beaufort Sea, Canada, 1971-2006
I. Stirling, T. L. McDonald, E.S. Richardson, E.V. Regehr, Steven C. Amstrup
2011, Ecological Applications (21) 859-876
Polar bears (Ursus maritimus) of the northern Beaufort Sea (NB) population occur on the perimeter of the polar basin adjacent to the northwestern islands of the Canadian Arctic Archipelago. Sea ice converges on the islands through most of the year. We used open-population capture–recapture models to estimate population size...
Oligocene and Miocene arc volcanism in northeastern California: evidence for post-Eocene segmentation of the subducting Farallon plate
J.P. Colgan, A.E. Egger, D. A. John, B. Cousens, R.J. Fleck, C.D. Henry
2011, Geosphere (7) 733-755
The Warner Range in northeastern California exposes a section of Tertiary rocks over 3 km thick, offering a unique opportunity to study the long-term history of Cascade arc volcanism in an area otherwise covered by younger volcanic rocks. The oldest locally sourced volcanic rocks in the Warner Range are Oligocene...
Forecasting carbon budget under climate change and CO2 fertilization for subtropical region in China using integrated biosphere simulator (IBIS) model
Q. Zhu, H. Jiang, J. Liu, C. Peng, X. Fang, S. Yu, G. Zhou, X. Wei, W. Ju
2011, Polish Journal of Ecology (59) 3-24
The regional carbon budget of the climatic transition zone may be very sensitive to climate change and increasing atmospheric CO2 concentrations. This study simulated the carbon cycles under these changes using process-based ecosystem models. The Integrated Biosphere Simulator (IBIS), a Dynamic Global Vegetation Model (DGVM), was used to evaluate the...
An ecosystem-scale model for the spread of a host-specific forest pathogen in the Greater Yellowstone Ecosystem
J.A. Hatala, M.C. Dietze, R.L. Crabtree, Katherine C. Kendall, D. Six, P.R. Moorcroft
2011, Ecological Applications (21) 1138-1153
The introduction of nonnative pathogens is altering the scale, magnitude, and persistence of forest disturbance regimes in the western United States. In the high-altitude whitebark pine (Pinus albicaulis) forests of the Greater Yellowstone Ecosystem (GYE), white pine blister rust (Cronartium ribicola) is an introduced fungal pathogen that is...
Porphyry Cu indicator minerals in till as an exploration tool: Example from the giant Pebble porphyry Cu-Au-Mo deposit, Alaska, USA
Karen D. Kelley, Robert G. Eppinger, J. Lang, Steven M. Smith, David L. Fey
2011, Geochemistry: Exploration, Environment, Analysis (11) 321-334
Porphyry Cu indicator minerals are mineral species in clastic sediments that indicate the presence of mineralization and hydrothermal alteration associated with porphyry Cu and associated skarn deposits. Porphyry Cu indicator minerals recovered from shallow till samples near the giant Pebble Cu-Au-Mo porphyry deposit in SW Alaska, USA, include apatite, andradite...
Integration of paleoseismic data from multiple sites to develop an objective earthquake chronology: Application to the Weber segment of the Wasatch fault zone, Utah
C. B. DuRoss, S. F. Personius, A. J. Crone, S.S. Olig, W.R. Lund
2011, Bulletin of the Seismological Society of America (101) 2765-2781
We present a method to evaluate and integrate paleoseismic data from multiple sites into a single, objective measure of earthquake timing and recurrence on discrete segments of active faults. We apply this method to the Weber segment (WS) of the Wasatch fault zone using data from four fault-trench studies completed...
Investigating the spatial distribution of water levels in the Mackenzie Delta using airborne LiDAR
C. Hopkinson, N. Crasto, P. Marsh, D. Forbes, L. Lesack
2011, Hydrological Processes (25) 2995-3011
Airborne light detection and ranging (LiDAR) data were used to map water level (WL) and hydraulic gradients (δH/δx) in the Mackenzie Delta. The LiDAR WL data were validated against eight independent hydrometric gauge measurements and demonstrated mean offsets from − 0·22 to + 0·04 m (σ< 0·11). LiDAR‐based WL gradients...
Variation in local abundance and species richness of stream fishes in relation to dispersal barriers: Implications for management and conservation
K.H. Nislow, M. Hudy, B. H. Letcher, E.P. Smith
2011, Freshwater Biology (56) 2135-2144
1.Barriers to immigration, all else being equal, should in principle depress local abundance and reduce local species richness. These issues are particularly relevant to stream-dwelling species when improperly designed road crossings act as barriers to migration with potential impacts on the viability of upstream populations. However, because abundance and richness...
Quantifying the hydrological responses to climate change in an intact forested small watershed in Southern China
G. Zhou, X. Wei, Y. Wu, Y. Huang, J. Yan, Dongxiao Zhang, Q. Zhang, J. Liu, Z. Meng, C. Wang, G. Chu, S. Liu, X. Tang, Xiuying Liu
2011, Global Change Biology (17) 3736-3746
Responses of hydrological processes to climate change are key components in the Intergovernmental Panel for Climate Change (IPCC) assessment. Understanding these responses is critical for developing appropriate mitigation and adaptation strategies for sustainable water resources management and protection of public safety. However, these responses are not well understood and little...
A Digital Hydrologic Network Supporting NAWQA MRB SPARROW Modeling--MRB_E2RF1WS
J. W. Brakebill, S.E. Terziotti
2011, Report
A digital hydrologic network was developed to support SPAtially Referenced Regression on Watershed attributes (SPARROW) models within selected regions of the United States. These regions correspond with the U.S. Geological Survey's National Water Quality Assessment (NAWQA) Program Major River Basin (MRB) study units 2, 3, 4, 5, and 7 (Preston...
Episodic growth of a Late Cretaceous and Paleogene intrusive complex of pegmatitic leucogranite, Ruby Mountains core complex, Nevada, USA
Keith A. Howard, J. L. Wooden, C. G. Barnes, W. R. Premo, A.W. Snoke, S.-Y. Lee
2011, Geosphere (7) 1220-1248
Gneissic pegmatitic leucogranite forms a dominant component (>600 km3) of the midcrustal infrastructure of the Ruby Mountains–East Humboldt Range core complex (Nevada, USA), and was assembled and modified episodically into a batholithic volume by myriad small intrusions from ca. 92 to 29 Ma. This injection complex consists of deformed sheets...
Social network models predict movement and connectivity in ecological landscapes
R. J. Fletcher Jr., M.A. Acevedo, Brian E. Reichert, Kyle E. Pias, W.M. Kitchens
2011, Proceedings of the National Academy of Sciences of the United States of America (108) 19282-19287
Network analysis is on the rise across scientific disciplines because of its ability to reveal complex, and often emergent, patterns and dynamics. Nonetheless, a growing concern in network analysis is the use of limited data for constructing networks. This concern is strikingly relevant to ecology and conservation biology, where network...
The distribution and abundance of a nuisance native alga, Didymosphen Didymosphenia geminata, in streams of Glacier National Park: Climate drivers and management implications
Schweiger E. William, I.W. Ashton, C.C. Muhlfeld, L.A. Jones, L.L. Bahls
2011, Park Science (28)
Didymosphenia geminata (didymo) is a freshwater alga native to North America, including Glacier National Park, Montana. It has long been considered a cold-water species, but has recently spread to lower latitudes and warmer waters, and increasingly forms large blooms that cover streambeds. We used a comprehensive monitoring data set from...
On the use of the beta distribution in probabilistic resource assessments
Ricardo A. Olea
2011, Natural Resources Research (20) 377-388
The triangular distribution is a popular choice when it comes to modeling bounded continuous random variables. Its wide acceptance derives mostly from its simple analytic properties and the ease with which modelers can specify its three parameters through the extremes and the mode. On the negative side, hardly any real...
Monitoring the Earthquake source process in North America
Robert B. Herrmann, H. Benz, C.J. Ammon
2011, Bulletin of the Seismological Society of America (101) 2609-2625
With the implementation of the USGS National Earthquake Information Center Prompt Assessment of Global Earthquakes for Response system (PAGER), rapid determination of earthquake moment magnitude is essential, especially for earthquakes that are felt within the contiguous United States. We report an implementation of moment tensor processing for application to broad,...
Estimating temporal trend in the presence of spatial complexity: A Bayesian hierarchical model for a wetland plant population undergoing restoration
T.J. Rodhouse, K.M. Irvine, K.T. Vierling, L.A. Vierling
2011, PLoS ONE (6)
Monitoring programs that evaluate restoration and inform adaptive management are important for addressing environmental degradation. These efforts may be well served by spatially explicit hierarchical approaches to modeling because of unavoidable spatial structure inherited from past land use patterns and other factors. We developed Bayesian hierarchical models to estimate trends...
Deep rock damage in the san andreas fault revealed by P- and S-type fault-zone-guided waves
William L. Ellsworth, Peter E. Malin
2011, Geological Society Special Publication (359) 39-53
Damage to fault-zone rocks during fault slip results in the formation of a channel of low seismic-wave velocities. Within such channels guided seismic waves, denoted by Fg, can propagate. Here we show with core samples, well logs and Fg-waves that such a channel is crossed by the SAFOD (San Andreas...
Reassessment of stable continental regions of Southeast Asia
R. L. Wheeler
2011, Seismological Research Letters (82) 971-983
Probabilistic seismic-hazard assessments of the central and eastern United States (CEUS) require estimates of the size of the largest possible earthquake (Mmax). In most of the CEUS, sparse historical seismicity does not provide a record of moderate and large earthquakes that is sufficient to constrain Mmax. One remedy for the...
Forecasting carbon budget under climate change and CO 2 fertilization for subtropical region in China using integrated biosphere simulator (IBIS) model
Q. Zhu, H. Jiang, J. Liu, C. Peng, X. Fang, S. Yu, G. Zhou, X. Wei, W. Ju
2011, Polish Journal of Ecology (59) 3-24
The regional carbon budget of the climatic transition zone may be very sensitive to climate change and increasing atmospheric CO 2 concentrations. This study simulated the carbon cycles under these changes using process-based ecosystem models. The Integrated Biosphere Simulator (IBIS), a Dynamic Global Vegetation Model (DGVM), was used to evaluate...
Modeling PSInSAR time series without phase unwrapping
L. Zhang, X. Ding, Z. Lu
2011, IEEE Transactions on Geoscience and Remote Sensing (49) 547-556
In this paper, we propose a least-squares-based method for multitemporal synthetic aperture radar interferometry that allows one to estimate deformations without the need of phase unwrapping. The method utilizes a series of multimaster wrapped differential interferograms with short baselines and focuses on arcs at which there are no phase ambiguities....
Using a genetic mixture model to study phenotypic traits: Differential fecundity among Yukon river Chinook Salmon
Jeffrey F. Bromaghin, D.F. Evenson, T.H. McLain, Blair G. Flannery
2011, Transactions of the American Fisheries Society (140) 235-249
Fecundity is a vital population characteristic that is directly linked to the productivity of fish populations. Historic data from Yukon River (Alaska) Chinook salmon Oncorhynchus tshawytscha suggest that length‐adjusted fecundity differs among populations within the drainage and either is temporally variable or has declined. Yukon River Chinook salmon have been harvested in...
Predicting community responses to perturbations in the face of imperfect knowledge and network complexity
M. Novak, J.T. Wootton, D.F. Doak, M. Emmerson, J. A. Estes, M. T. Tinker
2011, Ecology (92) 836-846
How best to predict the effects of perturbations to ecological communities has been a long-standing goal for both applied and basic ecology. This quest has recently been revived by new empirical data, new analysis methods, and increased computing speed, with the promise that ecologically important insights may be obtainable from...
