Hydrologic-hydraulic analysis of the Toa Vaca Dam
T.-S. Heriberto, A.C. MillerArthur
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
[No abstract available]...
Conceptual ecological model for management of breeding grassland birds in the Mid-Atlantic Region
Bruce G. Peterjohn
2006, Natural Resource Report NPS/NER/NRR--2006/005
The status of grassland birds has become an increasingly important conservation issue. These species exhibit the most consistent population declines of any group of North American birds during the past 40 years. Anecdotal evidence suggests these declines have been occurring for nearly a century (Peterjohn and Sauer 1999). While the...
Sources of variation in survival of breeding female wood ducks
Kevin M. Hartke, J.B. Grand, Gary R. Hepp, T.H. Folk
2006, Condor (108) 201-210
In waterfowl, reproduction is physiologically demanding and females are exposed to varying risks of mortality at different periods of the breeding cycle. Moreover, differences among females may influence survival within breeding periods. We captured and fitted female Wood Ducks (Aix sponsa) with radio-transmitters before nest initiation during two breeding seasons...
Degradation of water quality by bird feces in and around managed wetlands
G.G. Shellenbarger, A.B. Boehm
2006, Conference Paper, Proceedings of the South Bay Science Symposium
No abstract available....
Post-Eocene igneous and tectonic effects of spreading center subduction under southeast Alaska: Far-field effects of early Tertiary ridge subduction in Alaska
2006, Conference Paper, Proceedings of Conference on BackBone of the Americas - Patagonia to Alaska
No abstract available. ...
The chlorinated AHR ligand 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) promotes reactive oxygen species (ROS) production during embryonic development in the killifish (Fundulus heteroclitus)
Xabier Arzuaga, Deena Wassenberg, Richard D. Giulio, Adria Elskus
2006, Aquatic Toxicology (76) 13-23
Exposure to dioxin-like chemicals that activate the aryl hydrocarbon receptor (AHR) can result in increased cellular and tissue production of reactive oxygen species (ROS). Little is known of these effects during early fish development. We used the fish model, Fundulus heteroclitus, to determine if the AHR ligand and pro-oxidant 3,3′,4,4′,5-pentachlorobiphenyl (PCB126)...
Territoriality, site fidelity, and survivorship of willow flycatchers wintering in Costa Rica
T. J. Koronkiewicz, M. K. Sogge, Charles van Riper III, E. H. Paxton
2006, The Condor (108) 558-570
We studied wintering Willow Flycatchers (Empidonax traillii) in two seasonal freshwater wetland habitats in northwestern Costa Rica during five boreal winters, to determine habitat occupancy, overwinter and between-year site and territory fidelity, and the degree to which the sexes maintain and defend winter territories. Both males and females used agonistic...
Antarctic climate cooling and response of diatoms in glacial meltwater streams
R.M.M. Esposito, S.L. Horn, Diane M. McKnight, M.J. Cox, M.C. Grant, S. A. Spaulding, P.T. Doran, K.D. Cozzetto
2006, Geophysical Research Letters (33)
To understand biotic responses to an Antarctic cooling trend diatom samples from glacial meltwater streams in the McMurdo Dry Valleys, the largest ice-free area in Antarctica. Diatoms are abundant in these streams, and 24 of 40 species have only been found in the Antarctic. The percentage of these Antarctic diatom...
Cross-shore velocity shear, eddies and heterogeneity in water column properties over fringing coral reefs: West Maui, Hawaii
C. D. Storlazzi, M.A. McManus, J.B. Logan, B.E. McLaughlin
2006, Continental Shelf Research (26) 401-421
A multi-day hydrographic survey cruise was conducted to acquire spatially extensive, but temporally limited, high-resolution, three-dimensional measurements of currents, temperature, salinity and turbidity off West Maui in the summer of 2003 to better understand coastal dynamics along a complex island shoreline with coral reefs. These data complement long-term, high-resolution tide,...
Estimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration
M. Riedel, P.E. Long, T. S. Collett
2006, Marine Geology (227) 215-225
As part of Ocean Drilling Program Leg 204 at southern Hydrate Ridge off Oregon we have monitored changes in sediment electrical resistivity during controlled gas hydrate dissociation experiments. Two cores were used, each filled with gas hydrate bearing sediments (predominantly mud/silty mud). One core was from Site 1249 (1249F-9H3), 42.1...
Tracermodel1- Excel workbook for calculation and presentation of environmental tracer data for simple groundwater mixtures: Use of chlorofluorocarbons in hydrology - a guidebook; Section III.10.3
J.K. Bohlke
2006, Report
Atmospheric environmental tracers commonly used to date groundwater on timescales of years to decades include CFC-11, CFC-12, CFC-113, SF6, 85Kr, 3 H and 3 H/3 H0 , where 3 H0 refers to initial tritium (3 H + tritiogenic 3 He) (Cook and Herczeg, 2000). Interpretation of age from environmental tracer...
A rainfall loading response recorded at 300 meters depth: Implications for geological weighing lysimeters
M. Sophocleous, E. Bardsley, J. Healey
2006, Journal of Hydrology (319) 237-244
Static pore water pressures in confined aquifers vary in response to ground surface loading changes, including precipitation and evaporation. Under certain hydrogeological conditions such aquifers can function as giant natural weighing lysimeters, referenced here as 'geological weighing lysimeters'. The extent of the land area 'weighed' increases with aquifer depth and...
Predator functional response and prey survival: Direct and indirect interactions affecting a marked prey population
David A. Miller, J.B. Grand, T.F. Fondell, M. Anthony
2006, Journal of Animal Ecology (75) 101-110
1. Predation plays an integral role in many community interactions, with the number of predators and the rate at which they consume prey (i.e. their functional response) determining interaction strengths. Owing to the difficulty of directly observing predation events, attempts to determine the functional response of predators in natural systems...
Simulation of active tectonic processes for a convecting mantle with moving continents
V. Trubitsyn, M. Kaban, Walter D. Mooney, C. Reigber, P. Schwintzer
2006, Geophysical Journal International (164) 611-623
Numerical models are presented that simulate several active tectonic processes. These models include a continent that is thermally and mechanically coupled with viscous mantle flow. The assumption of rigid continents allows use of solid body equations to describe the continents' motion and to calculate their velocities. The starting point is...
Age-related body mass and reproductive measurements of gray wolves in Minnesota
L.D. Mech
2006, Journal of Mammalogy (87) 80-84
Based on 65 free-ranging gray wolves (Canis lupus) of known age and 25 of estimated age examined during summers of 1970-2004 in northeastern Minnesota, body mass of both males and females peaked at 5 or 6 years of age, with mean masses of 40.8 kg and 31.2 kg, respectively. Testis...
Probabilistic analysis of tsunami hazards
E.L. Geist, T. Parsons
2006, Natural Hazards (37) 277-314
Determining the likelihood of a disaster is a key component of any comprehensive hazard assessment. This is particularly true for tsunamis, even though most tsunami hazard assessments have in the past relied on scenario or deterministic type models. We discuss probabilistic tsunami hazard analysis (PTHA) from the standpoint of integrating...
Polychlorinated biphenyls, mercury, and potential endocrine disruption in fish from the Hudson River, New York, USA
Barry P. Baldigo, R.J. Sloan, S.B. Smith, N. D. Denslow, V. S. Blazer, T. S. Gross
2006, Aquatic Sciences (68) 206-228
Tissue residues of total mercury (Hg), total polychlorinated biphenyls (PCBs), and lipid-based PCBs; plasma concentrations of endocrine biomarkers; and reproductive and histologic biomarkers were assessed in 460 carp (Cyprinus carpio), bass (Micropterus salmoides and Micropterus dolomieui), and bullhead (Ameiurus nebulosus) collected from eight sites across the Hudson River Basin in...
Use of electric and bubble barriers to limit the movement of Eurasian ruffe (Gymnocephalus cernuus)
Heather A. Dawson, Ulrich G. Reinhardt, Jacqueline F. Savino
2006, Journal of Great Lakes Research (32) 40-49
Eurasian ruffe (Gymnocephalus cernuus) is an aquatic invasive species accidentally introduced via ballast water to the Great Lakes in the mid-1980s. Fish barrier technology is being studied to stop the spread of invasive fish species such as ruffe. Electrical barriers have been constructed, most notably in the Chicago Sanitary and...
High-resolution stratigraphy of a Mississippi subdelta-lobe progradation in the Barataria Bight, north-central Gulf of Mexico
J. G. Flocks, N.F. Ferina, C. Dreher, J. L. Kindinger, D. M. FitzGerald, M.A. Kulp
2006, Journal of Sedimentary Research (76) 429-443
The coastal zone of southeastern Louisiana is the product of numerous cycles of progradation, abandonment, and marine transgression of the Mississippi River delta. Currently, the shoreline in the Barataria Bight is undergoing significant erosion and retreat, and understanding its evolution is crucial in stabilization efforts. This study uses an extensive...
Effects of fire on plant communities
M.L. Brooks
2006, Book chapter, The Use of Fire as a Tool for Controlling Invasive Plants: Cal-IPC Publication 2006-01
No abstract available at this time...
Stable isotopic composition of chlorine and oxygen in synthetic and natural perchlorate
Neil C. Sturchio, J.K. Bohlke, Baohua Gu, Juske Horita, Gilbert M. Brown, Abelardo D. Beloso Jr., Leslie J. Patterson, Paul B. Hatzinger, W. Andrew Jackson, Jacimaria Batista
Baohua Gu, John D. Coates, editor(s)
2006, Book chapter, Perchlorate: Environmental occurrence, interactions and treatment
No abstract available....
Structure of the San Andreas fault zone at SAFOD from a seismic refraction survey
J.A. Hole, T. Ryberg, G. S. Fuis, F. Bleibinhaus, A.K. Sharma
2006, Geophysical Research Letters (33)
Refraction traveltimes from a 46-km long seismic survey across the San Andreas Fault were inverted to obtain two-dimensional velocity structure of the upper crust near the SAFOD drilling project. The model contains strong vertical and lateral velocity variations from <2 km/s to ???6 km/s. The Salinian terrane west of the...
Groundlayer vegetation gradients across oak woodland canopy gaps
N.B. Pavlovic, R. Grundel, W. Sluis
2006, Journal of the Torrey Botanical Society (133) 225-239
Frequency of groundlayer plants was measured across oak woodland canopy gaps at three sites in northwest Indiana to examine how vegetation varied with gap size, direction along the gap edge, and microhabitat. Microhabitats were defined as under the canopy adjacent to the gap, along the gap edge, and within the...
Long-term trends of bloater (Coregonus hoyi) recruitment in Lake Michigan: evidence for the effect of sex ratio
David B. Bunnell, Charles P. Madenjian, Thomas E. Croley II
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 832-844
Long-term population trends are generally explained by factors extrinsic (e.g., climate, predation) rather than intrinsic (e.g., genetics, maternal effects) to the population. We sought to understand the long-term population dynamics of an important native Lake Michigan prey fish, the bloaterCoregonus hoyi. Over a 38-year time series, three 10- to 15-year...
Reproducibility of geochemical and climatic signals in the Atlantic coral Montastraea faveolata
Joseph M. Smith, T. M. Quinn, K.P. Helmle, R. B. Halley
2006, Paleoceanography (21)
Monthly resolved, 41-year-long stable isotopic and elemental ratio time series were generated from two separate heads of Montastraea faveolata from Looe Key, Florida, to assess the fidelity of using geochemical variations in Montastraea, the dominant reef-building coral of the Atlantic, to reconstruct sea surface environmental conditions at this site. The...
