Exploring the temporal effects of seasonal water availability on the snail kite of Florida: Part III
Wolf M. Mooij, Julien Martin, Wiley M. Kitchens, Donald L. DeAngelis
2007, Book chapter, Temporal dimensions of landscape ecology: Wildlife responses to variable resources
The Florida snail kite (Rostrhamus sociabilis) is an endangered raptor that occurs as an isolated population, currently of about 2,000 birds, in the wetlands of southern and central Florida, USA. Its exclusive prey species, the apple snail (Pomacea paludosa) is strongly influenced by seasonal changes in...
Polycyclic aromatic hydrocarbon exposure in Steller's eiders (Polysticta stelleri) and harlequin ducks (Histronicus histronicus) in the Eastern Aleutian Islands, Alaska, USA
A.K. Miles, Paul L. Flint, K.A. Trust, M.A. Ricca, S.E. Spring, D.E. Arrieta, T. Hollmen, B.W. Wilson
2007, Environmental Toxicology and Chemistry (26) 2694-2703
Seaducks may be affected by harmful levels of polycyclic aromatic hydrocarbons (PAHs) at seaports near the Arctic. As an indicator of exposure to PAHs, we measured hepatic enzyme 7-ethoxyresorufin-O-deethylase activity (EROD) to determine cytochrome P4501A induction in Steller's eiders (Polysticta stelleri) and Harlequin ducks (Histronicus histronicus) from Unalaska, Popof, and...
Developing terrestrial, multi-taxon indices of biological integrity: An example from coastal sage scrub
J.E. Diffendorfer, G.M. Fleming, J.M. Duggan, R.E. Chapman, M.E. Rahn, M.J. Mitrovich, Robert N. Fisher
2007, Biological Conservation (140) 130-141
We screened 351 species or genera for their response to disturbance in coastal sage scrub (CSS) to develop a 15-metric, 5-taxon Index of Biological Integrity (IBI). We collected data on ants, birds, herpetofauna, small mammals, and plants for two years on 46 sites established across a gradient of disturbance in...
On the choice of statistical models for estimating occurrence and extinction from animal surveys
R.M. Dorazio
2007, Ecology (88) 2773-2782
In surveys of natural animal populations the number of animals that are present and available to be detected at a sample location is often low, resulting in few or no detections. Low detection frequencies are especially common in surveys of imperiled species; however, the choice of sampling method and protocol...
Gene expression in the liver of rainbow trout, Oncorhynchus mykiss, during the stress response
T.S. Momoda, A.R. Schwindt, G.W. Feist, L. Gerwick, C.J. Bayne, C.B. Schreck
2007, Comparative Biochemistry and Physiology, Part D: Genomics and Proteomics (2) 303-315
To better appreciate the mechanisms underlying the physiology of the stress response, an oligonucleotide microarray and real-time RT-PCR (QRT-PCR) were used to study gene expression in the livers of rainbow trout (Oncorhynchus mykiss). For increased confidence in the discovery of candidate genes responding to stress, we conducted two separate experiments...
Mars global digital dune database and initial science results
Rosalyn K. Hayward, Kevin F. Mullins, Lori K. Fenton, Trent M. Hare, Timothy N. Titus, Mary C. Bourke, Anthony Colaprete, Phillip R. Christensen
2007, Journal of Geophysical Research E: Planets (112)
A new Mars Global Digital Dune Database (MGD3) constructed using Thermal Emission Imaging System (THEMIS) infrared (IR) images provides a comprehensive and quantitative view of the geographic distribution of moderate‐ to large‐size dune fields (area >1 km2) that will help researchers to understand global climatic and sedimentary processes that have...
Palaeolimnological evidence of late-Holocene settlement and abandonment in the Mirador Basin, Peten, Guatemala
D. Wahl, R. Byrne, T. Schreiner, R. Hansen
2007, Holocene (17) 813-820
Pollen, loss on ignition and magnetic susceptibility analyses provide a high-resolution palaeoenvironmental record from Lago Puerto Arturo, Peten, Guatemala. The presence of Zea pollen ~2650 BC provides a latest date for the arrival of maize agriculture to the region. The following 3600 years are marked by significant opening of...
Application of ground-penetrating radar imagery for three-dimensional visualisation of near-surface structures in ice-rich permafrost, Barrow, Alaska
Jeffrey S. Munroe, James A. Doolittle, Mikhail Kanevskiy, Kenneth M. Hinkel, Frederick E. Nelson, Benjamin M. Jones, Yuri Shur, John M. Kimble
2007, Permafrost and Periglacial Processes (18) 309-321
Three-dimensional ground-penetrating radar (3D GPR) was used to investigate the subsurface structure of ice-wedge polygons and other features of the frozen active layer and near-surface permafrost near Barrow, Alaska. Surveys were conducted at three sites located on landscapes of different geomorphic age. At each site, sediment cores were collected and...
Hazard assessment of the Tidal Inlet landslide and potential subsequent tsunami, Glacier Bay National Park, Alaska
G. F. Wieczorek, E.L. Geist, R.J. Motyka, M. Jakob
2007, Landslides (4) 205-215
An unstable rock slump, estimated at 5 to 10 × 106 m3, lies perched above the northern shore of Tidal Inlet in Glacier Bay National Park, Alaska. This landslide mass has the potential to rapidly move into Tidal Inlet and generate large, long-period-impulse tsunami waves. Field and photographic examination...
Predicting wetland plant community responses to proposed water-level-regulation plans for Lake Ontario: GIS-based modeling
D.A. Wilcox, Y. Xie
2007, Journal of Great Lakes Research (33) 751-773
Integrated, GIS-based, wetland predictive models were constructed to assist in predicting the responses of wetland plant communities to proposed new water-level regulation plans for Lake Ontario. The modeling exercise consisted of four major components: 1) building individual site wetland geometric models; 2) constructing generalized wetland geometric models representing specific types...
Steeply dipping heaving bedrock, Colorado: Part 3 - Environmental controls and heaving processes
D.C. Noe, J.D. Higgins, H. W. Olsen
2007, Environmental & Engineering Geoscience (13) 325-344
This paper examines the environmental processes and mechanisms that govern differential heaving in steeply dipping claystone bedrock near Denver, Colorado. Three potential heave mechanisms and causal processes were evaluated: (1) rebound expansion, from reduced overburden stress; (2) expansive gypsum-crystal precipitation, from oxidation of pyrite; and (3) swelling of clay minerals,...
Consequences of land-cover misclassification in models of impervious surface
Gerard McMahon
2007, Photogrammetric Engineering and Remote Sensing (73) 1343-1353
Model estimates of impervious area as a function of landcover area may be biased and imprecise because of errors in the land-cover classification. This investigation of the effects of land-cover misclassification on impervious surface models that use National Land Cover Data (NLCD) evaluates the consequences of adjusting land-cover within a...
Effects of mother lode-type gold mineralization on 187Os/188Os and platinum group element concentrations in peridotite: Alleghany District, California
R.J. Walker, J.K. Böhlke, W.F. McDonough, Ji Li
2007, Economic Geology (102) 1079-1089
Osmium isotope compositions and concentrations of Re, platinum group elements (PGE), and Au were determined for host peridotites (serpentinites and barzburgites) and hydrothermally altered ultramafic wall rocks associated with Mother Lode-type hydrothermal gold-quartz vein mineralization in the Alleghany district, California. The host peridotites have Os isotope compositions and Re, PGE,...
Manganese-enhanced magnetic resonance microscopy of mineralization
I.E. Chesnick, T.I. Todorov, J.A. Centeno, D.E. Newbury, Justin R. Small, K. Potter
2007, Magnetic Resonance Imaging (25) 1095-1104
Paramagnetic manganese (II) can be employed as a calcium surrogate to sensitize magnetic resonance microscopy (MRM) to the processing of calcium during bone formation. At high doses, osteoblasts can take up sufficient quantities of manganese, resulting in marked changes in water proton T1, T2 and magnetization transfer ratio values compared...
Reproductive phenologies in a diverse temperate ant fauna
R.R. Dunn, C.R. Parker, M. Geraghty, N.J. Sanders
2007, Ecological Entomology (32) 135-142
1. Ant nuptial flights are central to understanding ant life history and ecology but have been little studied. This study examined the timing of nuptial flights, the synchronicity of nuptial flights (as a potential index of mating strategy), and variation in nuptial flights with elevation and among years in a...
Detection of group 1 coronaviruses in bats in North America
S.R. Dominguez, T. J. O'Shea, L.M. Oko, K.V. Holmes
2007, Emerging Infectious Diseases (13) 1295-1300
The epidemic of severe acute respiratory syndrome (SARS) was caused by a newly emerged coronavirus (SARS-CoV). Bats of several species in southern People's Republic of China harbor SARS-like CoVs and may be reservoir hosts for them. To determine whether bats in North America also harbor coronaviruses, we used reverse transcription-PCR...
A new ghost-node method for linking different models and initial investigations of heterogeneity and nonmatching grids
J.E. Dickinson, S.C. James, S. Mehl, M. C. Hill, S. A. Leake, G.A. Zyvoloski, C.C. Faunt, A.-A. Eddebbarh
2007, Advances in Water Resources (30) 1722-1736
A flexible, robust method for linking parent (regional-scale) and child (local-scale) grids of locally refined models that use different numerical methods is developed based on a new, iterative ghost-node method. Tests are presented for two-dimensional and three-dimensional pumped systems that are homogeneous or that have simple heterogeneity. The parent and...
Optimal use of resources structures home ranges and spatial distribution of black bears
M.S. Mitchell, R. A. Powell
2007, Animal Behaviour (74) 219-230
Research has shown that territories of animals are economical. Home ranges should be similarly efficient with respect to spatially distributed resources and this should structure their distribution on a landscape, although neither has been demonstrated empirically. To test these hypotheses, we used home range models that optimize resource use according...
The distribution, occurrence and environmental effect of mercury in Chinese coals
Lingyun Zheng, Gaisheng Liu, C. L. Chou
2007, Science of the Total Environment (384) 374-383
Mercury (Hg) is a toxic, persistent, and globally distributed pollutant due to its characteristic properties such as low melting and boiling points, conversion between chemical forms and participation in biological cycles. During combustion mercury in coal is almost totally emitted to the atmosphere. With a huge amount of coal consumed,...
The relationship between circulating ecdysteroids and chela allometry in male tanner crabs: Evidence for a terminal molt in the genus Chionoecetes
S.L. Tamone, S. James Taggart, A.G. Andrews, Jennifer Mondragon, J.K. Nielsen
2007, Journal of Crustacean Biology (27) 635-642
Whether male Tanner crabs, Chionoecetes bairdi, undergo a terminal molt associated with a change in claw allometry has long been debated. We measured molting hormone levels in captured male C. bairdi to assess the potential for molting. We plotted a frequency histogram of chela height to carapace width ratios and...
Stability and uncertainty of finite-fault slip inversions: Application to the 2004 Parkfield, California, earthquake
S. Hartzell, P. Liu, C. Mendoza, C. Ji, K.M. Larson
2007, Bulletin of the Seismological Society of America (97) 1911-1934
The 2004 Parkfield, California, earthquake is used to investigate stability and uncertainty aspects of the finite-fault slip inversion problem with different a priori model assumptions. We utilize records from 54 strong ground motion stations and 13 continuous, 1-Hz sampled, geodetic instruments. Two inversion procedures are compared: a linear least-squares subfault-based...
Local structuring factors of invertebrate communities in ephemeral freshwater rock pools and the influence of more permanent water bodies in the region
M. Jocque, T. Graham, L. Brendonck
2007, Hydrobiologia (592) 271-280
We used three isolated clusters of small ephemeral rock pools on a sandstone flat in Utah to test the importance of local structuring processes on aquatic invertebrate communities. In the three clusters we characterized all ephemeral rock pools (total: 27) for their morphometry, and monitored their water quality, hydrology and...
Estimating fishing mortality, natural mortality, and selectivity using recoveries from tagging young fish
H. Jiang, C. Brownie, J.E. Hightower, K. H. Pollock
2007, North American Journal of Fisheries Management (27) 773-781
Current methods for estimation of age- and year-specific instantaneous mortality rates based on multiyear, multiple-age tagging studies assume that it is feasible to tag fish in a wide range of ages. For some species, however, only the youngest one or two age-classes are readily available for tagging. Given the practical...
Manganese biogeochemistry in a central Czech Republic catchment
T. Navratil, J. B. Shanley, P. Skrivan, P. Kram, M. Mihaljevic, P. Drahota
2007, Water, Air, & Soil Pollution (186) 149-165
Mn biogeochemistry was studied from 1994 to 2003 in a small forested catchment in the central Czech Republic using the watershed mass balance approach together with measurements of internal stores and fluxes. Mn inputs in bulk deposition were relatively constant during a period of sharply decreasing acidic deposition, suggesting that...
Rainfall limit of the N cycle on Earth
Stephanie A. Ewing, Greg Michalski, Mark Thiemens, R.C. Quinn, J. L. Macalady, S. Kohl, Scott D. Wankel, Carol Kendall, Christopher P McKay, Ronald Amundson
2007, Global Biogeochemical Cycles (21)
In most climates on Earth, biological processes control soil N. In the Atacama Desert of Chile, aridity severely limits biology, and soils accumulate atmospheric NO3−. We examined this apparent transformation of the soil N cycle using a series of ancient Atacama Desert soils (>2 My) that vary in rainfall (21...
