Mark-recapture using tetracycline and genetics reveal record-high bear density
Elizabeth L. Peacock, Kimberly Titus, David L. Garshelis, Mary M. Peacock, Miroslaw Kuc
2011, Journal of Wildlife Management (75) 1513-1520
We used tetracycline biomarking, augmented with genetic methods to estimate the size of an American black bear (Ursus americanus) population on an island in Southeast Alaska. We marked 132 and 189 bears that consumed remote, tetracycline-laced baits in 2 different years, respectively, and observed 39 marks in 692 bone samples...
Pore morphology effect in microlog for porosity prediction in a mature field
W.J. Teh, G.P. Willhite, J.H. Doveton, J.S. Tsau
2011, Conference Paper, SPE Eastern Regional Meeting
In an matured field, developed during the 1950s, no porosity logs were available from sources other than invaded zone resistivity Rxo . The microresistivity porosity is calibrated with the core porosity to yield an accurate estimate of the porosity. However, the procedure of calibrating the porosity with Rxo for a...
Holocene record of precipitation seasonality from lake calcite δ18O in the central Rocky Mountains, United States
Lesleigh Anderson
2011, Geology (39) 211-214
A context for recent hydroclimatic extremes and variability is provided by a ∼10 k.y. sediment carbonate oxygen isotope (δ18O) record at 5–100 yr resolution from Bison Lake, 3255 m above sea level, in northwestern Colorado (United States). Winter precipitation is the primary water source for the alpine headwater lake in...
Effects of dynamically variable saturation and matrix-conduit coupling of flow in karst aquifers
Thomas Reimann, T. Geyer, W.B. Shoemaker, R. Liedl, M. Sauter
2011, Water Resources Research (47)
Well-developed karst aquifers consist of highly conductive conduits and a relatively low permeability fractured and/or porous rock matrix and therefore behave as a dual-hydraulic system. Groundwater flow within highly permeable strata is rapid and transient and depends on local flow conditions, i.e., pressurized or nonpressurized flow. The characterization of karst...
Wetland vegetation in Manzala lagoon, Nile Delta coast, Egypt: Rapid responses of pollen to altered nile hydrology and land use
C.E. Bernhardt, J.-D. Stanley, B. P. Horton
2011, Journal of Coastal Research (27) 731-737
The pollen record in a sediment core from Manzala lagoon on the Nile delta coastal margin of Egypt, deposited from ca. AD 1860 to 1990, indicates rapid coastal wetland vegetation responses to two primary periods of human activity. These are associated with artificially altered Nile hydrologic regimes in proximal areas and distal...
Spatial variation in transient water table responses: Differences between an upper and lower hillslope zone
D.R.W. Haught, H. J. Van Meerveld
2011, Hydrological Processes (25) 3866-3877
To better understand storage-runoff dynamics, transient groundwater responses were examined in one of the steep watersheds in British Columbia's coastal mountains. Streamflow and piezometric data were collected for 1year to determine the spatial and temporal relations between transient groundwater levels and discharge. Correlations between piezometer responses and lag-time analysis were...
Seawater calcium isotope ratios across the Eocene-Oligocene transition
E.M. Griffith, A. Paytan, A. Eisenhauer, Thomas D. Bullen, E. Thomas
2011, Geology (39) 683-686
During the Eocene-Oligocene transition (EOT, ca. 34 Ma), Earth's climate cooled significantly from a greenhouse to an icehouse climate, while the calcite (CaCO3) compensation depth (CCD) in the Pacific Ocean increased rapidly. Fluctuations in the CCD could result from various processes that create an imbalance between calcium (Ca) sources to,...
A case study of alternative site response explanatory variables in Parkfield, California
E.M. Thompson, L.G. Baise, R. E. Kayen, E.C. Morgan, J. Kaklamanos
2011, Conference Paper, Geotechnical Special Publication
The combination of densely-spaced strong-motion stations in Parkfield, California, and spectral analysis of surface waves (SASW) profiles provides an ideal dataset for assessing the accuracy of different site response explanatory variables. We judge accuracy in terms of spatial coverage and correlation with observations. The performance of the alternative models is...
Pore fluid geochemistry from the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slope
M.E. Torres, Timothy S. Collett, K.K. Rose, J.C. Sample, Warren F. Agena, E.J. Rosenbaum
2011, Marine and Petroleum Geology (28) 332-342
The BPXA-DOE-USGS Mount Elbert Gas Hydrate Stratigraphic Test Well was drilled and cored from 606.5 to 760.1 m on the North Slope of Alaska, to evaluate the occurrence, distribution and formation of gas hydrate in sediments below the base of the ice-bearing permafrost. Both the dissolved chloride and the isotopic composition...
A new geological framework for south-central Madagascar, and its relevance to the "out-of-Africa" hypothesis
R. D. Tucker, J.Y. Roig, P. H. Macey, C. Delor, Y. Amelin, R. A. Armstrong, M.H. Rabarimanana, A.V. Ralison
2011, Precambrian Research (185) 109-130
The Precambrian shield of south-central Madagascar, excluding the Vohibory region, consists of three geologic domains, from north to south: Antananarivo, Ikalamavony-Itremo, and Anosyen-Androyen. The northern Antananarivo domain represents the Neoarchean sector of the Greater Dharwar Craton amalgamated at 2.52-2.48. Ga. The Greater Dharwar Craton is overlain by several groups of...
Effects of environmental temperature on the dynamics of ichthyophoniasis in Juvenile Pacific Herring (Clupea pallasii)
J.L. Gregg, Johanna J. Vollenweider, C.A. Grady, R.A. Heintz, P.K. Hershberger
2011, Journal of Parasitology Research (2011)
The effects of temperature and infection by Ichthyophonus were examined in juvenile Pacific herring (Clupea pallasii) maintained under simulated overwinter fasting conditions. In addition to defining parameters for a herring bioenergetics model (discussed in Vollenweider et al. this issue), these experiments provided new insights into factors influencing the infectivity and...
Modeling of hydroecological feedbacks predicts distinct classes of landscape pattern, process, and restoration potential in shallow aquatic ecosystems
Laurel G. Larsen, Judson W. Harvey
2011, Geomorphology (126) 279-296
It is widely recognized that interactions between vegetation and flow cause the emergence of channel patterns that are distinct from the standard Schumm classification of river channels. Although landscape pattern is known to be linked to ecosystem services such as habitat provision, pollutant removal, and sustaining biodiversity, the mechanisms...
Effects of a low severity prescribed fire on water-soluble elements in ash from a cork oak (Quercus suber) forest located in the northeast of the Iberian Peninsula
P. Pereira, X. beda, Deborah A. Martin, J. Mataix-Solera, C. Guerrero
2011, Environmental Research (111) 237-247
Wildfire is the major disturbance in Mediterranean forests. Prescribed fire can be an alternative to reduce the amount of fuel and hence decrease the wildfire risk. However the effects of prescribed fire must be studied, especially on ash properties, because ash is an important nutrient source for ecosystem recovery. The...
Updated paleomagnetic pole from Cretaceous plutonic rocks of the Sierra Nevada, California: Tectonic displacement of the Sierra Nevada block
John W. Hillhouse, Sherman Gromme
2011, Lithosphere (3) 275-288
We report remanent magnetization measurements from 13 sites in Cretaceous plutonic rocks in the northern Sierra Nevada (38°N–39.5°N). By increasing the number of available paleomagnetic sites, the new data tighten constraints on the displacement history of the Sierra Nevada block and its pre-extensional position relative to interior North America. We...
InSAR observations of aseismic slip associated with an earthquake swarm in the Columbia River flood basalts
Charles Wicks, W. Thelen, C. Weaver, J. Gomberg, A. Rohay, P. Bodin
2011, Journal of Geophysical Research B: Solid Earth (116)
In 2009 a swarm of small shallow earthquakes occurred within the basalt flows of the Columbia River Basalt Group (CRBG). The swarm occurred within a dense seismic network in the U.S. Department of Energys Hanford Site. Data from the seismic network along with interferometric synthetic aperture radar (InSAR) data from...
Terrestrial source to deep-sea sink sediment budgets at high and low sea levels: Insights from tectonically active Southern California
J.A. Covault, B.W. Romans, S.A. Graham, A. Fildani, G.E. Hilley
2011, Geology (39) 619-622
Sediment routing from terrestrial source areas to the deep sea influences landscapes and seascapes and supply and filling of sedimentary basins. However, a comprehensive assessment of land-to-deep-sea sediment budgets over millennia with significant climate change is lacking. We provide source to sink sediment budgets using cosmogenic radionuclide–derived terrestrial denudation rates...
Wave-current interaction in Willapa Bay
Maitane Olabarrieta, John C. Warner, Nirnimesh Kumar
2011, Journal of Geophysical Research C: Oceans (116)
This paper describes the importance of wave-current interaction in an inlet-estuary system. The three-dimensional, fully coupled, Coupled Ocean-Atmosphere-Wave-Sediment Transport (COAWST) modeling system was applied in Willapa Bay (Washington State) from 22 to 29 October 1998 that included a large storm event. To represent the interaction between waves and currents, the...
Beaver assisted river valley formation
Cherie J. Westbrook, D.J. Cooper, Bruce W. Baker
2011, River Research and Applications (27) 247-256
We examined how beaver dams affect key ecosystem processes, including pattern and process of sediment deposition, the composition and spatial pattern of vegetation, and nutrient loading and processing. We provide new evidence for the formation of heterogeneous beaver meadows on riverine system floodplains and terraces where dynamic flows are capable...
More than a century of bathymetric observations and present-day shallow sediment characterization in Belfast Bay, Maine, USA: Implications for pockmark field longevity
Laura L. Brothers, J. T. Kelley, D. F. Belknap, Walter Barnhardt, Brian Andrews, M.L. Maynard
2011, Geo-Marine Letters (31) 237-248
Mechanisms and timescales responsible for pockmark formation and maintenance remain uncertain, especially in areas lacking extensive thermogenic fluid deposits (e.g., previously glaciated estuaries). This study characterizes seafloor activity in the Belfast Bay, Maine nearshore pockmark field using (1) three swath bathymetry datasets collected between 1999 and 2008, complemented by analyses...
Soil carbon sequestration potential for "grain for green" project in Loess Plateau, China
R. Chang, B. Fu, Gaisheng Liu, S. Liu
2011, Environmental Management (48) 1158-1172
Conversion of cropland into perennial vegetation land can increase soil organic carbon (SOC) accumulation, which might be an important mitigation measure to sequester carbon dioxide from the atmosphere. The “Grain for Green” project, one of the most ambitious ecological programmes launched in modern China, aims at transforming the low-yield slope...
Coelomic implantation of satellite transmitters in the bar-tailed godwit (Limosa lapponica) and the bristle-thighed curlew (Numenius tahitiensis) using propofol, bupivacaine, and lidocaine
Daniel M. Mulcahy, Brett D. Gartrell, Robert E. Gill Jr., T. Lee Tibbitts, Daniel R. Ruthrauff
2011, Journal of Zoo and Wildlife Medicine (42) 54-64
Intravenous propofol was used as a general anesthetic with a 2∶1 (mg∶mg) adjunctive mixture of lidocaine and bupivacaine as local anesthetics infiltrated into the surgical sites for implantation of satellite transmitters into the right abdominal air sac of 39 female and 4 male bar-tailed godwits (Limosa lapponica baueri and Limosa...
Agave turneri (Agavaceae), a new species from northeastern Baja California, Mexico
R. H. Webb, J. M. Salazar-Cesena
2011, Brittonia (63) 203-210
Agave turneri, a new species of Agave from the Sierras Cucap?? and El Mayor in northeastern Baja California, Mexico, is a medium-sized species that does not produce offsets, has a relatively short and narrow panicle, and has a distinctive flower structure. The closest relatives to this new species are Agave...
Paleogene calcareous nannofossils of Southern Maryland, South Dover Bridge Core, USA
Jean M. Self-Trail
2011, Journal of Nannoplankton Research (32) 1-28
No abstract available...
Metacommunity theory as a multispecies, multiscale framework for studying the influence of river network structure on riverine communities and ecosystems
B.L. Brown, C.M. Swan, D.A. Auerbach, Grant E.H. Campbell, N.P. Hitt, K.O. Maloney, C. Patrick
2011, Journal of the North American Benthological Society (30) 310-327
Explaining the mechanisms underlying patterns of species diversity and composition in riverine networks is challenging. Historically, community ecologists have conceived of communities as largely isolated entities and have focused on local environmental factors and interspecific interactions as the major forces determining species composition. However, stream ecologists have long embraced a...
W is for weathered rock
W. H. Langer
2011, Aggregates Manager (16)
