Site condition, structure, and growth of baldcypress along tidal/non-tidal salinity gradients
K. W. Krauss, J.A. Duberstein, T.W. Doyle, W.H. Conner, Richard H. Day, L.W. Inabinette, J.L. Whitbeck
2009, Wetlands (29) 505-519
This report documents changes in forest structure and growth potential of dominant trees in salt-impacted tidal and non-tidal baldcypress wetlands of the southeastern United States. We inventoried basal area and tree height, and monitored incremental growth (in basal area) of codominant baldcypress (Taxodium distichum) trees monthly, for over four years,...
Ecology and the ratchet of events: Climate variability, niche dimensions, and species distributions
S.T. Jackson, J.L. Betancourt, R.K. Booth, S.T. Gray
2009, Conference Paper, Proceedings of the National Academy of Sciences of the United States of America
Climate change in the coming centuries will be characterized by interannual, decadal, and multidecadal fluctuations superimposed on anthropogenic trends. Predicting ecological and biogeographic responses to these changes constitutes an immense challenge for ecologists. Perspectives from climatic and ecological history indicate that responses will be laden with contingencies, resulting from episodic...
Comparing approaches for simulating the reactive transport of U(VI) in ground water
G.P. Curtis, M. Kohler, J.A. Davis
2009, Mine Water and the Environment (28) 84-93
The reactive transport of U(VI) in a well-characterized shallow alluvial aquifer at a former U(VI) mill located near Naturita, CO, was predicted for comparative purposes using a surface complexation model (SCM) and a constant K d approach to simulate U(VI) adsorption. The ground water at the site had U(VI) concentrations that...
Using geometrical, textural, and contextual information of land parcels for classification of detailed urban land use
S.-S. Wu, X. Qiu, E.L. Usery, L. Wang
2009, Annals of the Association of American Geographers (99) 76-98
Detailed urban land use data are important to government officials, researchers, and businesspeople for a variety of purposes. This article presents an approach to classifying detailed urban land use based on geometrical, textural, and contextual information of land parcels. An area of 6 by 14 km in Austin, Texas, with...
A mactrid bivalve from pleistocene deposits of Lake Russell, Mono Basin, California
R. Hershler, A. S. Jayko
2009, Journal of Paleontology (83) 496-499
[No abstract available]...
Evaluating the spatial variation of total mercury in young-of-year yellow perch (Perca flavescens), surface water and upland soil for watershed-lake systems within the southern Boreal Shield
M.C. Gabriel, R. Kolka, T. Wickman, E. Nater, Laurel G. Woodruff
2009, Science of the Total Environment (407) 4117-4126
The primary objective of this research is to investigate relationships between mercury in upland soil, lake water and fish tissue and explore the cause for the observed spatial variation of THg in age one yellow perch (Perca flavescens) for ten lakes within the Superior National Forest. Spatial relationships between yellow...
Mercury demethylation in waterbird livers: Dose-response thresholds and differences among species
Collin A. Eagles-Smith, Joshua T. Ackerman, Y.E.E. Julie, T.L. Adelsbach
2009, Environmental Toxicology and Chemistry (28) 568-577
We assessed methylmercury (MeHg) demethylation in the livers of adults and chicks of four waterbird species that commonly breed in San Francisco Bay: American avocets, black-necked stilts, Caspian terns, and Forster's terns. In adults (all species combined), we found strong evidence for a threshold, model where MeHg demethylation occurred above...
Patterns and determinants of mammal species occurrence in India
K.K. Karanth, J.D. Nichols, J.E. Hines, K. U. Karanth, N.L. Christensen
2009, Journal of Applied Ecology (46) 1189-1200
Many Indian mammals face range contraction and extinction, but assessments of their population status are hindered by the lack of reliable distribution data and range maps. 2. We estimated the current geographical ranges of 20 species of large mammals by applying occupancy models to data from country-wide expert. We modelled...
Possible deep fault slip preceding the 2004 Parkfield earthquake, inferred from detailed observations of tectonic tremor
David R. Shelly
2009, Geophysical Research Letters (36) 1-6
Earthquake predictability depends, in part, on the degree to which sudden slip is preceded by slow aseismic slip. Recently, observations of deep tremor have enabled inferences of deep slow slip even when detection by other means is not possible, but these data are limited to certain areas and mostly the...
Murres, capelin and ocean climate: Inter-annual associations across a decadal shift
P.M. Regular, F. Shuhood, T. Power, W.A. Montevecchi, G.J. Robertson, D. Ballam, John F. Piatt, B. Nakashima
2009, Environmental Monitoring and Assessment (156) 293-302
To ensure energy demands for reproduction are met, it is essential that marine birds breed during periods of peak food availability. We examined associations of the breeding chronology of common murres (Uria aalge) with the timing of the inshore arrival of their primary prey, capelin (Mallotus villosus) from 1980 to...
The moon as a radiometric reference source for on-orbit sensor stability calibration
T.C. Stone
2009, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
The wealth of data generated by the world's Earth-observing satellites, now spanning decades, allows the construction of long-term climate records. A key consideration for detecting climate trends is precise quantification of temporal changes in sensor calibration on-orbit. For radiometer instruments in the solar reflectance wavelength range (near-UV to shortwave-IR), the...
Pre-impact tectonothermal evolution of the crystalline basement-derived rocks in the ICDP-USGS Eyreville B core, Chesapeake Bay impact structure
R.L. Gibson, G.N. Townsend, J. Wright Horton Jr., W.U. Reimold
2009, Special Paper of the Geological Society of America 235-254
Pre-impact crystalline rocks of the lowermost 215 m of the Eyreville B drill core from the Chesapeake Bay impact structure consist of a sequence of pelitic mica schists with subsidiary metagraywackes or felsic metavolcanic rocks, amphibolite, and calc-silicate rock that is intruded by muscovite (??biotite, garnet) granite and granite pegmatite....
Structural evolution of the Ural-Tian Shan junction: A view from Karatau ridge, South Kazakhstan
D.V. Alexeiev, H. E. Cook, V.M. Buvtyshkin, L.Y. Golub
2009, Comptes Rendus - Geoscience (341) 287-297
The deformation history of the Late Palaeozoic Ural-Tian Shan junction is discussed for the example of the Karatau ridge in southern Kazakhstan. Three deformation events are recognized. The Late Carboniferous D1 event is characterized by Laramide-style thrust-and-fold structures on the southern margin of Kazakhstan with shortening in a NE-SW direction....
Characterisation of carbon nanotubes in the context of toxicity studies
D. Berhanu, A. Dybowska, S.K. Misra, C.J. Stanley, P. Ruenraroengsak, A.R. Boccaccini, T.D. Tetley, S. N. Luoma, J.A. Plant, E. Valsami-Jones
2009, Environmental Health (8)
Nanotechnology has the potential to revolutionise our futures, but has also prompted concerns about the possibility that nanomaterials may harm humans or the biosphere. The unique properties of nanoparticles, that give them novel size dependent functionalities, may also have the potential to cause harm. Discrepancies in existing human health...
Retrospective characterization of ontogenetic shifts in killer whale diets via δ13C and δ15N analysis of teeth
Seth D. Newsome, Michael A. Etnier, Daniel H. Monson, Marilyn L. Fogel
2009, Marine Ecology Progress Series (374) 229-242
Metabolically inert, accretionary structures such as the dentin growth layers in teeth provide a life history record of individual diet with near-annual resolution. We constructed ontogenetic δ13C and δ15N profiles by analyzing tooth dentin growth layers from 13 individual killer whales Orcinus orca collected in the eastern northeast Pacific Ocean...
Evaluation of acute copper toxicity to juvenile freshwater mussels (fatmucket, lampsilis siliquoidea) in natural and reconstituted waters
N. Wang, C.A. Mebane, J.L. Kunz, C.G. Ingersoll, T.W. May, W.R. Arnold, R.C. Santore, T. Augspurger, F.J. Dwyer, M.C. Barniiart
2009, Environmental Toxicology and Chemistry (28) 2367-2377
The influence of dissolved organic carbon (DOC) and water composition on the toxicity of copper to juvenile freshwater mussels (fatmucket, Lampsilis siliquoidea) were evaluated in natural and reconstituted waters. Acute 96‐h copper toxicity tests were conducted at four nominal DOC concentrations (0, 2.5, 5, and 10 mg/L...
Habitat occupancy and detection of the pacific sheath-tailed bat (emballonura semicaudata) on aguiguan, commonwealth of the northern Mariana Islands
P. M. Gorresen, F.J. Bonaccorso, C.A. Pinzari
2009, Acta Chiropterologica (11) 331-342
Occupancy analysis was used to quantify Pacific sheath-tailed bat (Emballonura semicaudata) foraging activity and its relationship to forest structure and proximity to cave roosts on Aguiguan Island in the Commonwealth of the Northern Mariana Islands. Bat occurrence was most closely associated with canopy cover, vegetation stature and distance to known...
Local-scale variability of seepage and hydraulic conductivity in a shallow gravel-bed river
D.O. Rosenberry, J. Pitlick
2009, Hydrological Processes (23) 3306-3318
Seepage rate and direction measured with a seepage metre modified for use in flowing water were greatly variable along a 300-m reach of a shallow, gravel-bed river and depended primarily on the local-scale bed topography. The median value of seepage measured at 24 locations was 24 cm/day, but seepage measured...
An evaluation of sex-age-kill (SAK) model performance
Joshua J. Millspaugh, John R. Skalski, Richard L. Townsend, Duane R. Diefenbach, Mark S. Boyce, Lonnie P. Hansen, Kent Kammermeyer
2009, Journal of Wildlife Management (73) 442-451
The sex-age-kill (SAK) model is widely used to estimate abundance of harvested large mammals, including white-tailed deer (Odocoileus virginianus). Despite a long history of use, few formal evaluations of SAK performance exist. We investigated how violations of the stable age distribution and stationary population assumption, changes to male or female...
Breeding-season sympatry facilitates genetic exchange among allopatric wintering populations of Northern Pintails in Japan and California
Paul L. Flint, Kiyoaki Ozaki, John M. Pearce, Brian Guzzetti, Hiroyoshi Higuchi, Joseph P. Fleskes, Tetsuo Shimada, Dirk V. Derksen
2009, Condor (111) 591-598
The global redistribution of pathogens, such as highly pathogenic avian influenza, has renewed interest in the connectivity of continental populations of birds. Populations of the Northern Pintail (Anas acuta) wintering in Japan and California are considered separate from a management perspective. We used data from band recoveries and population genetics...
Analysis of lidar elevation data for improved identification and delineation of lands vulnerable to sea-level rise
Dean B. Gesch
2009, Journal of Coastal Research (Special Issue 53) 49-58
The importance of sea-level rise in shaping coastal landscapes is well recognized within the earth science community, but as with many natural hazards, communicating the risks associated with sea-level rise remains a challenge. Topography is a key parameter that influences many of the processes involved in coastal change, and thus,...
Water balance dynamics in the Nile Basin
Gabriel B. Senay, Kwabena Asante, Guleid A. Artan
2009, Hydrological Processes (23) 3675-3681
Understanding the temporal and spatial dynamics of key water balance components of the Nile River will provide important information for the management of its water resources. This study used satellite-derived rainfall and other key weather variables derived from the Global Data Assimilation System to estimate and map the distribution of...
High-frequency in situ optical measurements during a storm event: Assessing relationships between dissolved organic matter, sediment concentrations, and hydrologic processes
John Franco Saraceno, Brian A. Pellerin, Bryan D. Downing, Emmanuel Boss, Philip A. M. Bachand, Brian A. Bergamaschi
2009, Journal of Geological Research (114)
Dissolved organic matter (DOM) dynamics during storm events has received considerable attention in forested watersheds, but the extent to which storms impart rapid changes in DOM concentration and composition in highly disturbed agricultural watersheds remains poorly understood. In this study, we used identical in situ optical sensors for DOM fluorescence...
Hurricane Rita and the destruction of Holly Beach, Louisiana: Why the chenier plain is vulnerable to storms
Asbury H. Sallenger Jr., C. W. Wright, Kara Doran, K. Guy, Karen Morgan
2009, Special Paper of the Geological Society of America (460) 127-135
Hurricane Rita devastated gulf-front communities along the western Louisiana coast in 2005. LIDAR (light detection and ranging) topographic surveys and aerial photography collected before and after the storm showed the loss of every structure within the community of Holly Beach. Average shoreline change along western Louisiana's 140-km-long impacted shore was...
Unraveling the stratigraphy of the Oriskany Sandstone: A necessity in assessing its site-specific carbon sequestration potential
J. Kostelnik, K.M. Carter
2009, Environmental Geosciences (16) 187-200
The widespread distribution, favorable reservoir characteristics, and depth make the Lower Devonian Oriskany Sandstone a viable sequestration target in the Appalachian Basin. The Oriskany Sandstone is thickest in the structurally complex Ridge and Valley Province, thins toward the northern and western basin margins, and is even absent in other parts...
