A condensed middle Cenomanian succession in the Dakota Sandstone (Upper Cretaceous), Sevilleta National Wildlife Refuge, Socorro County, New Mexico
Stephen C. Hook, William A. Cobban
2007, New Mexico Geology (29) 75-96
The upper part of the Dakota Sandstone exposed on the Sevilleta National Wildlife Refuge, northern Socorro County, New Mexico, is a condensed, Upper Cretaceous, marine succession spanning the first five middle Cenomanian ammonite zones of the U.S. Western Interior. Farther north in New Mexico these five ammonite zones occur over...
Responses of hydrochemical inorganic ions in the rainfall-runoff processes of the experimental catchments and its significance for tracing
W.-Z. Gu, J.-J. Lu, X. Zhao, N.E. Peters
2007, Shuikexue Jinzhan/Advances in Water Science (18) 1-7
Aimed at the rainfall-runoff tracing using inorganic ions, the experimental study is conducted in the Chuzhou Hydrology Laboratory with special designed experimental catchments, lysimeters, etc. The various runoff components including the surface runoff, interflow from the unsaturated zone and the groundwater flow from saturated zone were monitored hydrometrically. Hydrochemical inorganic...
Does avian species richness in natural patch mosaics follow the forest fragmentation paradigm?
D.C. Pavlacky Jr., S.H. Anderson
2007, Animal Conservation (10) 57-68
As one approaches the north-eastern limit of pinyon (Pinus spp.) juniper (Juniperus spp.) vegetation on the Colorado Plateau, USA, woodland patches become increasingly disjunct, grading into sagebrush (Artemisia spp.)-dominated landscapes. Patterns of avian species richness in naturally heterogeneous forests may or may not respond to patch discontinuity in the same...
Responses of prairie arthropod communities to fire and fertilizer: Balancing plant and arthropod conservation
M.K. Hartley, W.E. Rogers, E. Siemann, J. Grace
2007, American Midland Naturalist (157) 92-105
Fire is an important tool for limiting woody plant invasions into prairies, but using fire management to maintain grassland plant communities may inadvertently reduce arthropod diversity. To test this, we established twenty-four 100 m2 plots in a tallgrass prairie in Galveston County, Texas, in spring 2000. Plots were assigned a...
Infection by a black spot-causing species of Uvulifer and associated opercular alterations in fishes from a high-desert stream in Wyoming
M.C. Quist, M.R. Bower, W.A. Hubert
2007, Diseases of Aquatic Organisms (78) 129-136
Black spot is a common disease syndrome of freshwater fishes. This study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, Uvulifer sp., infecting native and non-native catostomids and cyprinids of the Upper Colorado River Basin. We...
Population status of North American green sturgeon, Acipenser medirostris
P.B. Adams, C. Grimes, J.E. Hightower, S.T. Lindley, M.L. Moser, M.J. Parsley
2007, Environmental Biology of Fishes (79) 339-356
North American green sturgeon, Acipenser medirostris, was petitioned for listing under the Endangered Species Act (ESA). The two questions that need to be answered when considering an ESA listing are; (1) Is the entity a species under the ESA and if so (2) is the "species" in danger of extinction...
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...
Effect of relative volume on radio transmitter expulsion in subadult common carp
C.R. Penne, N.L. Ahrens, R.C. Summerfelt, C.L. Pierce
2007, North American Journal of Fisheries Management (27) 986-991
Expulsion of surgically implanted radio transmitters is a problem in some fish telemetry studies. We conducted a 109-d experiment to test the hypothesis that variation in relative volume of transmitters surgically implanted in subadult common carp Cyprinus carpio would affect transmitter expulsion. We also necropsied fish at the end of...
Interactions across spatial scales among forest dieback, fire, and erosion in northern New Mexico landscapes
Craig D. Allen
2007, Ecosystems (10) 797-808
Ecosystem patterns and disturbance processes at one spatial scale often interact with processes at another scale, and the result of such cross-scale interactions can be nonlinear dynamics with thresholds. Examples of cross-scale pattern-process relationships and interactions among forest dieback, fire, and erosion are illustrated from northern New Mexico (USA) landscapes,...
Moult migration of emperor geese Chen canagica between Alaska and Russia
Jerry W. Hupp, Joel A. Schmutz, Craig R. Ely, E.E. Syroechkovskiy Jr., Alexander V. Kondratyev, W.D. Eldridge, E. Lappo
2007, Journal of Avian Biology (38) 462-470
We studied reproductive success and post-breeding movements of 32 adult female emperor geese Chen canagica that were marked with satellite radio transmitters on their nesting area on the Yukon-Kuskokwim Delta (YKD), Alaska 2000–2004. All 16 females that failed to successfully reproduce departed the YKD and moulted remiges either on the north coast...
Application of a source apportionment model in consideration of volatile organic compounds in an urban stream
W.E. Asher, W. Luo, K.W. Campo, D.A. Bender, K. W. Robinson, J.S. Zogorski, J. F. Pankow
2007, Environmental Toxicology and Chemistry (26) 1606-1613
Position-dependent concentrations of trichloroethylene and methyl-tert-butyl ether are considered for a 2.81-km section of the Aberjona River in Massachusetts, USA. This river flows through Woburn and Winchester (Massachusetts, USA), an area that is highly urbanized, has a long history of industrial activities dating to the early 1800s, and has gained...
Robust 24 ± 6 ka 40Ar/39Ar age of a low-potassium tholeiitic basalt in the Lassen region of NE California
Brent D. Turrin, L.J. Patrick Muffler, Michael A. Clynne, Duane E. Champion
2007, Quaternary Research (68) 96-110
40Ar/39Ar ages on the Hat Creek Basalt (HCB) and stratigraphically related lava flows show that latest Pleistocene tholeiitic basalt with very low K2O can be dated reliably. The HCB underlies ∼ 15 ka glacial gravel and overlies four andesite and basaltic andesite lava flows that yield 40Ar/39Ar ages of 38 ± 7 ka (Cinder Butte; 1.65%...
First description of the nest, eggs, and breeding behavior of the Mérida Tapaculo (Scytalopus meridanus)
Karie L. Decker, Alina M. Niklison, Thomas E. Martin
2007, Wilson Journal of Ornithology (119) 121-124
We provide the first description of the nest, eggs, and breeding behavior of the Mérida Tapaculo (Scytalopus meridanus). Data are from one pair in the moist cloud forest of Yacambu National Park, Venezuela during April–May 2004. Two nests, constructed by the same pair, were globular in structure and consisted of...
Earthquake likelihood model testing
D. Schorlemmer, M.C. Gerstenberger, S. Wiemer, D.D. Jackson, D.A. Rhoades
2007, Seismological Research Letters (78) 17-29
INTRODUCTIONThe Regional Earthquake Likelihood Models (RELM) project aims to produce and evaluate alternate models of earthquake potential (probability per unit volume, magnitude, and time) for California. Based on differing assumptions, these models are produced to test the validity of their assumptions and to explore which models should be incorporated...
Scaling local species-habitat relations to the larger landscape with a hierarchical spatial count model
W.E. Thogmartin, M. G. Knutson
2007, Landscape Ecology (22) 61-75
Much of what is known about avian species-habitat relations has been derived from studies of birds at local scales. It is entirely unclear whether the relations observed at these scales translate to the larger landscape in a predictable linear fashion. We derived habitat models and mapped predicted abundances for three...
Sea level rise in Tampa Bay
T. Cronin, N.T. Edgar, Gillian L. Brooks, D. Hastings, R. Larson, A. Hine, S. Locker, B. Suthard, B. Flower, D. Hollander, J. Wehmiller, D. Willard, S. Smith
2007, Eos, Transactions, American Geophysical Union (88) 117-118
Understanding relative sea level (RSL) rise during periods of rapid climatic change is critical for evaluating modern sea level rise given the vulnerability of Antarctic ice shelves to collapse [Hodgson et al, 2006], the retreat of the world's glaciers [Oerlemans, 2005], and mass balance trends of the Greenland ice sheet [Rignot and...
Lead (Pb) in old Antarctic ice: Some from dust, some from other sources
T. Hinkley
2007, Geophysical Research Letters (34)
Recently published data on amounts and isotopic compositions of lead (Pb) and on amounts of mineral dust in pre-industrial Antarctic ice can be further interpreted by means of simple calculations. These show that two distinct types of Pb were provided by the atmosphere to the continent in varying proportions during...
Population-specific demographic estimates provide insights into declines of Lark Buntings (Calamospiza melanocorys)
A. A. Yackel Adams, S. K. Skagen, J. A. Savidge
2007, The Auk (124) 578-593
Many North American prairie bird populations have recently declined, and the causes of these declines remain largely unknown. To determine whether population limitation occurs during breeding, we evaluated the stability of a population of prairie birds using population-specific values for fecundity and postfledging survival. During 2001-2003, we radiomarked 67 female...
A multidisciplinary study of the Lower Cretaceous Cedar Mountain Formation, Mussentuchit Wash, Utah: a determination of the paleoenvironment and paleoecology of the Eolambia caroljonesa dinosaur quarry
J.R. Garrison Jr., D. Brinkman, D. J. Nichols, P. Layer, D. Burge, D. Thayn
2007, Cretaceous Research (28) 461-494
A quarry within the Cedar Mountain Formation in Mussentuchit Wash, Emery County, Utah, produced a fossil assemblage containing the remains of at least eight juvenile iguanodontid dinosaurs (Eolambia caroljonesa). The Cedar Mountain Formation lies stratigraphically between the Tithonian-Berriasian (Upper Jurassic) Brushy Basin Member of the Morrison Formation and the Cenomanian...
Establishing a beachhead: A stochastic population model with an Allee effect applied to species invasion
A. S. Ackleh, L.J.S. Allen, J. Carter
2007, Theoretical Population Biology (71) 290-300
We formulated a spatially explicit stochastic population model with an Allee effect in order to explore how invasive species may become established. In our model, we varied the degree of migration between local populations and used an Allee effect with variable birth and death rates. Because of the stochastic component,...
Characterization of methane hydrate host sediments using synchrotron-computed microtomography (CMT)
K.W. Jones, H. Feng, S. Tomov, W.J. Winters, M. Prodanovic, D. Mahajan
2007, Journal of Petroleum Science and Engineering (56) 136-145
The hydrate-sediment interaction is an important aspect of gas hydrate studies that needs further examination. We describe here the applicability of the computed microtomography (CMT) technique that utilizes an intense X-ray synchrotron source to characterize sediment samples, two at various depths from the Blake Ridge area (a well-known hydrate-prone region)...
A project for monitoring trends in burn severity
Jeffery C. Eidenshink, Brian Schwind, Ken Brewer, Zhu-Liang Zhu, Brad Quayle, Stephen M. Howard
2007, Fire Ecology (3) 3-21
Jeff Eidenshink, Brian Schwind, Ken Brewer, Zhi-Liang Zhu, Brad Quayle, and Elected officials and leaders of environmental agencies need information about the effects of large wildfires in order to set policy and make management decisions. Recently, the Wildland Fire Leadership Council (WFLC), which implements and coordinates the National Fire Plan...
Evaluation of potentially nonlethal sampling methods for monitoring mercury concentrations in smallmouth bass (Micropterus dolomieu)
C. J. Schmitt, W. G. Brumbaugh
2007, Archives of Environmental Contamination and Toxicology (53) 84-95
We evaluated three potentially nonlethal alternatives to fillet sampling for the determination of mercury (Hg) concentrations in smallmouth bass (Micropterus dolomieu). Fish (n = 62, 226-464 mm total length) from six sites in southern Missouri were captured by electrofishing. Blood samples (1 mL) from each fish were obtained by caudal...
Multiple-method estimation of recharge rates at diverse locations in the North Carolina Coastal Plain, USA
A. L. Coes, T.B. Spruill, M.J. Thomasson
2007, Hydrogeology Journal (15) 773-788
Recharge rates determined at diverse study sites in a shallow, unconfined aquifer differed from one another depending on the analytical method used and on each method's applicability and limitations. Total recharge was quantified with saturated-zone methods using water-table fluctuations at seven sites in North Carolina, USA and using groundwater-age dating...
Long-term performance of Aanderaa optodes and sea-bird SBE-43 dissolved-oxygen sensors bottom mounted at 32 m in Massachusetts Bay
Marinna A. Martini, Bradford Butman, Michael J. Mickelson
2007, Journal of Atmospheric and Oceanic Technology (24) 1924-1935
A field evaluation of two new dissolved-oxygen sensing technologies, the Aanderaa Instruments AS optode model 3830 and the Sea-Bird Electronics, Inc., model SBE43, was carried out at about 32-m water depth in western Massachusetts Bay. The optode is an optical sensor that measures fluorescence quenching by oxygen molecules, while the...
