On valuing patches: Estimating contributions to metapopulation growth with reverse-time capture-recapture modelling
J.S. Sanderlin, P.M. Waser, J.E. Hines, J.D. Nichols
2012, Proceedings of the Royal Society B: Biological Sciences (279) 480-488
Metapopulation ecology has historically been rich in theory, yet analytical approaches for inferring demographic relationships among local populations have been few. We show how reverse-time multi-state capture–recapture models can be used to estimate the importance of local recruitment and interpopulation dispersal to metapopulation growth. We use ‘contribution metrics’ to infer...
Effects of high fire frequency in creosote bush scrub vegetation of the Mojave Desert
M.L. Brooks
2012, International Journal of Wildland Fire (21) 61-68
Plant invasions can increase fire frequency in desert ecosystems where fires were historically infrequent. Although there are many resource management concerns associated with high frequency fire in deserts, fundamental effects on plant community characteristics remain largely unstudied. Here I describe the effects of fire frequency on creosote bush scrub vegetation...
Mapping carbon flux uncertainty and selecting optimal locations for future flux towers in the Great Plains
Yingxin Gu, Daniel M. Howard, Bruce K. Wylie, Li Zhang
2012, Landscape Ecology (27) 319-326
Flux tower networks (e. g., AmeriFlux, Agriflux) provide continuous observations of ecosystem exchanges of carbon (e. g., net ecosystem exchange), water vapor (e. g., evapotranspiration), and energy between terrestrial ecosystems and the atmosphere. The long-term time series of flux tower data are essential for studying and understanding terrestrial carbon cycles,...
Fate of 4-nonylphenol and 17β-estradiol in the Redwood River of Minnesota
Jeffrey H. Writer, Joseph N. Ryan, Steffanie H. Keefe, Larry B. Barber
2012, Environmental Science & Technology (46) 860-868
The majority of previous research investigating the fate of endocrine-disrupting compounds has focused on single processes generally in controlled laboratory experiments, and limited studies have directly evaluated their fate and transport in rivers. This study evaluated the fate and transport of 4-nonylphenol, 17β-estradiol, and estrone in a 10-km reach of...
CO2–rock–brine interactions in Lower Tuscaloosa Formation at Cranfield CO2 sequestration site, Mississippi, U.S.A.
Jiemin Lu, Yousif K. Kharaka, James J. Thordsen, Juske Horita, Athanasios Karamalidis, Craig Griffith, J. Alexandra Hakala, Gil Ambats, David R. Cole, Tommy J. Phelps, Michael A. Manning, Paul J. Cook, Susan D. Hovorka
2012, Chemical Geology (291) 269-277
A highly integrated geochemical program was conducted at the Cranfield CO2-enhanced oil recovery (EOR) and sequestration site, Mississippi, U.S.A.. The program included extensive field geochemical monitoring, a detailed petrographic study, and an autoclave experiment under in situ reservoir conditions. Results show that mineral reactions in the Lower Tuscaloosa reservoir were...
Spatial patterns of soil nitrification and nitrate export from forested headwaters in the northeastern United States
D.S. Ross, J. B. Shanley, J.L. Campbell, G.B. Lawrence, S.W. Bailey, G.E. Likens, B.C. Wemple, G. Fredriksen, A.E. Jamison
2012, Journal of Geophysical Research G: Biogeosciences (117)
Nitrogen export from small forested watersheds is known to be affected by N deposition but with high regional variability. We studied 10 headwater catchments in the northeastern United States across a gradient of N deposition (5.4 - 9.4 kg ha -1 yr -1) to determine if soil nitrification...
Nekton density patterns and hurricane recovery in submerged aquatic vegetation, and along non-vegetated natural and created edge habitats
Megan La Peyre, J. Gordon
2012, Estuarine, Coastal and Shelf Science (98) 108-118
We compared nekton habitat value of submerged aquatic vegetation, flooded non-vegetated natural and man-made edge habitats in mesohaline interior marsh areas in southwest Louisiana using a 1-m2 throw trap and 3-mm bag seine. When present, SAV habitats supported close to 4 times greater densities and higher species richness of nekton as compared to either natural or man-made...
Roost networks of northern myotis (Myotis septentrionalis) in a managed landscape
J.B. Johnson, W. Mark Ford, J.W. Edwards
2012, Forest Ecology and Management (266) 223-231
Maternity groups of many bat species conform to fission–fusion models and movements among diurnal roost trees and individual bats belonging to these groups use networks of roost trees. Forest disturbances may alter roost networks and characteristics of roost trees. Therefore, at the Fernow Experimental Forest in West Virginia, we examined...
Regional scale impacts of Tamarix leaf beetles (Diorhabda carinulata) on the water availability of western U.S. rivers as determined by multi-scale remote sensing methods
Pamela L. Nagler, Tim Brown, Kevin R. Hultine, Charles van Riper III, Daniel W. Bean, Philip E. Dennison, R. Scott Murray, Edward P. Glenn
2012, Remote Sensing of Environment (118) 227-240
Tamarix leaf beetles (Diorhabda carinulata) have been widely released on western U.S. rivers to control introduced shrubs in the genus Tamarix. Part of the motivation to control Tamarix is to salvage water for human use. Information is needed on the impact of beetles on Tamarix seasonal leaf production and subsequent...
The use of multiobjective calibration and regional sensitivity analysis in simulating hyporheic exchange
Ramon C. Naranjo, Richard G. Niswonger, Mark Stone, Clinton Davis, Alan McKay
2012, Water Resources Research (48)
We describe an approach for calibrating a two-dimensional (2-D) flow model of hyporheic exchange using observations of temperature and pressure to estimate hydraulic and thermal properties. A longitudinal 2-D heat and flow model was constructed for a riffle-pool sequence to simulate flow paths and flux rates for variable discharge conditions....
A spatial cluster analysis of tractor overturns in Kentucky from 1960 to 2002
D.M. Saman, H.P. Cole, A. Odoi, M.L. Myers, D.I. Carey, S.C. Westneat
2012, PLoS ONE (7)
Background:Agricultural tractor overturns without rollover protective structures are the leading cause of farm fatalities in the United States. To our knowledge, no studies have incorporated the spatial scan statistic in identifying high-risk areas for tractor overturns. The aim of this study was to determine whether tractor overturns cluster in certain...
Numerical models of salt marsh evolution: Ecological, geomorphic, and climatic factors
S. Fagherazzi, M. L. Kirwan, S.M. Mudd, G.R. Guntenspergen, S. Temmerman, A. D'Alpaos, J. Van De Koppel, J.M. Rybczyk, E. Reyes, C. Craft, J. Clough
2012, Reviews of Geophysics (50)
Salt marshes are delicate landforms at the boundary between the sea and land. These ecosystems support a diverse biota that modifies the erosive characteristics of the substrate and mediates sediment transport processes. Here we present a broad overview of recent numerical models that quantify the formation and evolution of salt...
Semiochemical compounds of preen secretion reflect genetic make-up in a seabird species
S. Leclaire, T. Merkling, C. Raynaud, Herve Mulard, J.-M. Bessiere, E.M. Lhuillier, Scott A. Hatch, E. Danchin
2012, Proceedings of the Royal Society B: Biological Sciences (279) 1185-1193
Several vertebrates choose their mate according to genetic heterozygosity and relatedness, and use odour cues to assess their conspecifics' genetic make-up. In birds, although several species (including the black-legged kittiwake) exhibit non-random mating according to genetic traits, the cues used to assess genetic characteristics remain unknown. The importance of olfaction...
Magnetostratigraphy of the Neogene Chaka basin and its implications for mountain building processes in the north-eastern Tibetan Plateau
H.-P. Zhang, W.H. Craddock, Richard O. Lease, W.-T. Wang, D.-Y. Yuan, P.-Z. Zhang, P. Molnar, D.-W. Zheng, W.-J. Zheng
2012, Basin Research (24) 31-50
Magnetostratigraphy of sedimentary rock deposited in the Chaka basin (north‐eastern Tibetan Plateau) indicates a late Miocene onset of basin formation and subsequent development of the adjacent Qinghai Nan Shan. Sedimentation in the basin initiated at ∼11 Ma. In the lower part of the basin fill, a coarsening‐upward sequence starting at ∼9 Ma,...
The effect of diagenesis and fluid migration on rare earth element distribution in pore fluids of the northern Cascadia accretionary margin
Ji-Hoon Kim, Marta E. Torres, Brian A. Haley, Miriam Kastner, John W. Pohlman, Michael Riedel, Young-Joo Lee
2012, Chemical Geology (291) 152-165
Analytical challenges in obtaining high quality measurements of rare earth elements (REEs) from small pore fluid volumes have limited the application of REEs as deep fluid geochemical tracers. Using a recently developed analytical technique, we analyzed REEs from pore fluids collected from Sites U1325 and U1329, drilled on the northern...
Crucial nesting habitat for gunnison sage-grouse: A spatially explicit hierarchical approach
Cameron L. Aldridge, D.J. Saher, T.M. Childers, K.E. Stahlnecker, Z.H. Bowen
2012, Journal of Wildlife Management (76) 391-406
Gunnison sage-grouse (Centrocercus minimus) is a species of special concern and is currently considered a candidate species under Endangered Species Act. Careful management is therefore required to ensure that suitable habitat is maintained, particularly because much of the species' current distribution is faced with exurban development pressures. We assessed hierarchical...
Thinning of young Douglas-fir forests decreases density of northern flying squirrels in the Oregon Cascades
Tom Manning, Joan C. Hagar, Brenda C. McComb
2012, Forest Ecology and Management (264) 115-124
Large-scale commercial thinning of young forests in the Pacific Northwest is currently promoted on public lands to accelerate the development of late-seral forest structure for the benefit of wildlife species such as northern spotted owls (Strix occidentalis caurina) and their prey, including the northern flying squirrel (Glaucomys sabrinus). Attempts to...
Slab1.0: A three-dimensional model of global subduction zone geometries
Gavin P. Hayes, David J. Wald, Rebecca L. Johnson
2012, Journal of Geophysical Research B: Solid Earth (117)
We describe and present a new model of global subduction zone geometries, called Slab1.0. An extension of previous efforts to constrain the two-dimensional non-planar geometry of subduction zones around the focus of large earthquakes, Slab1.0 describes the detailed, non-planar, three-dimensional geometry of approximately 85% of subduction zones worldwide. While the...
Isotopically modified nanoparticles for enhanced detection in bioaccumulation studies
S.K. Misra, A. Dybowska, D. Berhanu, Marie Noele Croteau, Samuel N. Luoma, A.R. Boccaccini, E. Valsami-Jones
2012, Environmental Science & Technology (46) 1216-1222
This work presents results on synthesis of isotopically enriched (99% 65Cu) copper oxide nanoparticles and its application in ecotoxicological studies. 65CuO nanoparticles were synthesized as spheres (7 nm) and rods (7 × 40 nm). Significant differences were observed between the reactivity and dissolution of spherical and rod shaped nanoparticles. The extreme sensitivity...
Quantifying anthropogenically driven morphologic changes on a barrier island: Fire Island National Seashore, New York
Meredith G. Kratzmann, Cheryl J. Hapke
2012, Journal of Coastal Research (28) 76-88
Beach scraping, beach replenishment, and the presence of moderate development have altered the morphology of the dune–beach system at Fire Island National Seashore, located on a barrier island on the south coast of Long Island, New York. Seventeen communities are interspersed with sections of natural, nonmodified land within the park...
Legacies of flood reduction on a dryland river
J.C. Stromberg, P.B. Shafroth, A.F. Hazelton
2012, River Research and Applications (28) 143-159
The Bill Williams (Arizona) is a regulated dryland river that is being managed, in part, for biodiversity via flow management. To inform management, we contrasted riparian plant communities between the Bill Williams and an upstream free‐flowing tributary (Santa Maria). Goals of a first study (1996–1997) were to identify environmental controls...
Methylation of Hg downstream from the Bonanza Hg mine, Oregon
John E. Gray, Mark E. Hines, David P. Krabbenhoft, Bryn Thoms
2012, Applied Geochemistry (27) 106-114
Speciation of Hg and conversion to methyl-Hg were evaluated in stream sediment, stream water, and aquatic snails collected downstream from the Bonanza Hg mine, Oregon. Total production from the Bonanza mine was >1360t of Hg, during mining from the late 1800s to 1960, ranking it as an intermediate sized Hg...
Hybrid-optimization algorithm for the management of a conjunctive-use project and well field design
Yung-Chia Chiu, Tracy Nishikawa, Peter Martin
2012, Ground Water (50) 103-117
Hi‐Desert Water District (HDWD), the primary water‐management agency in the Warren Groundwater Basin, California, plans to construct a waste water treatment plant to reduce future septic‐tank effluent from reaching the groundwater system. The treated waste water will be reclaimed by recharging the groundwater basin via recharge ponds as part of...
A riverscape perspective of Pacific salmonids and aquatic habitats prior to large-scale dam removal in the Elwha River, Washington, USA
S.J. Brenkman, J.J. Duda, C.E. Torgersen, E. Welty, G.R. Pess, R. Peters, M.L. McHenry
2012, Fisheries Management and Ecology (19) 36-53
Dam removal has been increasingly proposed as a river restoration technique. In 2011, two large hydroelectric dams will be removed from Washington State’s Elwha River. Ten anadromous fish populations are expected to recolonise historical habitats after dam removal. A key to understanding watershed recolonisation is the collection of spatially continuous...
Trophic cascades linking wolves (Canis lupus), coyotes (Canis latrans), and small mammals
B.J. Miller, H.J. Harlow, T.S. Harlow, D. Biggins, W. J. Ripple
2012, Canadian Journal of Zoology (90) 70-78
When large carnivores are extirpated from ecosystems that evolved with apex predators, these systems can change at the herbivore and plant trophic levels. Such changes across trophic levels are called cascading effects and they are very important to conservation. Studies on the effects of reintroduced wolves in Yellowstone National Park...
