Sediment organic carbon burial in agriculturally eutrophic impoundments over the last century
J. A. Downing, J. J. Cole, J. J. Middelburg, Robert G. Striegl, C.M. Duarte, Pirkko Kortelainen, Y.T. Prairie, K.A. Laube
2008, Global Biogeochemical Cycles (22)
We estimated organic carbon (OC) burial over the past century in 40 impoundments in one of the most intensively agricultural regions of the world. The volume of sediment deposited per unit time varied as a function of lake and watershed size, but smaller impoundments had greater deposition and accumulation rates...
Thiamine and fatty acid content of Lake Michigan Chinook salmon
D. C. Honeyfield, A. K. Peters, M.L. Jones
2008, Journal of Great Lakes Research (34) 581-589
Nutritional status of Lake Michigan Chinook salmon (Oncorhynchus tshawytscha) is inadequately documented. An investigation was conducted to determine muscle and liver thiamine content and whole body fatty acid composition in small, medium and large Chinook salmon. Muscle and liver thiamine concentrations were highest in small salmon, and tended to decrease...
A survey of the indigenous microbiota (bacteria) in three species of mussels from the Clinch and Holston Rivers, Virginia
Clifford E. Starliper, Richard J. Neves, Shane D. Hanlon, Pamela Whittington
2008, Journal of Shellfish Research (27) 1311-1317
Freshwater mussel conservation efforts by many federal and state agencies have increased in recent years. This has led to a greater number of stream surveys, in which mussel die-offs involving high numbers of dead and moribund animals are being observed and reported with greater frequency. Typically, die-offs have...
Experimental evidence of vocal recognition in young and adult black-legged kittiwakes
Herve Mulard, T. Aubin, J.F. White, Scott A. Hatch, E. Danchin
2008, Animal Behaviour (76) 1855-1861
Individual recognition is required in most social interactions, and its presence has been confirmed in many species. In birds, vocal cues appear to be a major component of recognition. Curiously, vocal recognition seems absent or limited in some highly social species such as the black-legged <a title="Learn more about Kittiwake from...
Quasi-periodic bedding in the sedimentary rock record of mars
Kevin W. Lewis, Oded Aharonson, John P. Grotzinger, Randolph L. Kirk, Alfred S. McEwen, Terry-Ann Suer
2008, Science (322) 1532-1535
Widespread sedimentary rocks on Mars preserve evidence of surface conditions different from the modern cold and dry environment, although it is unknown how long conditions favorable to deposition persisted. We used 1-meter stereo topographic maps to demonstrate the presence of rhythmic bedding at several outcrops in the Arabia Terra region....
Lesser snow geese and ross's geese form mixed flocks during winter but differ in family maintenance and social status
J.E. Jonsson, A. D. Afton
2008, Wilson Journal of Ornithology (120) 725-731
Smaller species are less likely to maintain families (or other forms of social groups) than larger species and are more likely to be displaced in competition with larger species. We observed mixed-species flocks of geese in southwest Louisiana and compared frequencies of social groups and success in social encounters of...
Growth, population structure, and reproduction of western pond turtles (Actinemys marmorata) on the central coast of California
D.J. Germano, G. B. Rathbun
2008, Chelonian Conservation and Biology (7) 188-194
We studied the population structure and growth of western pond turtles (Actinemys marmorata) at Vandenberg Air Force Base along the coast of central California in April 1995 and June 1996. We captured 179 individuals (115 males, 27 females) from 7 ponds during 26 days of trapping. Many turtles were adult-sized,...
Earthquake recurrence on the south Hayward fault is most consistent with a time dependent, renewal process
T. Parsons
2008, Geophysical Research Letters (35)
Elastic rebound and stress renewal are important components of earthquake forecasting because if large earthquakes can be shown to be periodic, then rupture probability is time dependent. While renewal models are used in formal forecasts, it has not been possible to exclude the alternate view that repeated large earthquakes can...
Multiple proximate and ultimate causes of natal dispersal in white-tailed deer
E.S. Long, Duane R. Diefenbach, C.S. Rosenberry, B.D. Wallingford
2008, Behavioral Ecology (19) 1235-1242
Proximate and ultimate causes of dispersal in vertebrates vary, and relative importance of these causes is poorly understood. Among populations, inter- and intrasexual social cues for dispersal are thought to reduce inbreeding and local mate competition, respectively, and specific emigration cue may affect dispersal distance, such that inbreeding avoidance dispersal...
Volatile emissions and gas geochemistry of Hot Spring Basin, Yellowstone National Park, USA
C. Werner, S. Hurwitz, William C. Evans, J. B. Lowenstern, D. Bergfeld, H. Heasler, C. Jaworowski, A. Hunt
2008, Journal of Volcanology and Geothermal Research (178) 751-762
We characterize and quantify volatile emissions at Hot Spring Basin (HSB), a large acid-sulfate region that lies just outside the northeastern edge of the 640 ka Yellowstone Caldera. Relative to other thermal areas in Yellowstone, HSB gases are rich in He and H2, and mildly enriched in CH4 and H2S....
Investigation of flow and transport processes at the MADE site using ensemble Kalman filter
Gaisheng Liu, Y. Chen, Dongxiao Zhang
2008, Advances in Water Resources (31) 975-986
In this work the ensemble Kalman filter (EnKF) is applied to investigate the flow and transport processes at the macro-dispersion experiment (MADE) site in Columbus, MS. The EnKF is a sequential data assimilation approach that adjusts the unknown model parameter values based on the observed data with time. The classic...
Paleocurrent and fabric analyses of the imbricated fluvial gravel deposits in Huangshui Valley, the northeastern Tibetan Plateau, China
X. Miao, H. Lu, Z. Li, G. Cao
2008, Geomorphology (99) 433-442
Gravel deposits on fluvial terraces contain a wealth of information about the paleofluvial system. In this study, flow direction and provenance were determined by systematic counts of more than 2000 clasts of imbricated gravel deposits in the Xining Region, northeastern Tibetan Plateau, China. These gravel deposits range in age from...
Pliocene role in assessing future climate impacts
M.M. Robinson, H.J. Dowsett, M.A. Chandler
2008, Eos, Transactions, American Geophysical Union (89) 501-502
[No abstract available]...
SHRIMP-RG U-Pb isotopic systematics of zircon from the Angel Lake orthogneiss, East Humboldt Range, Nevada: Is this really archean crust?
Wayne R. Premo, Pedro Castineiras, Joseph L. Wooden
2008, Geosphere (4) 963-975
New SHRIMP-RG (sensitive high-resolution ion microprobe-reverse geometry) data confirm the existence of Archean components within zircon grains of a sample from the orthogneiss of Angel Lake, Nevada, United States, previously interpreted as a nappe of Archean crust. However, the combined evidence strongly suggests that this orthogneiss is a highly deformed,...
Application of synchrotron methods to assess the uptake of roadway-derived Zn by earthworms in an urban soil
S.M. Lev, E. R. Landa, K. Szlavecz, R. Casey, J. Snodgrass
2008, Mineralogical Magazine (72) 191-195
The impact of human activities on biogeochemical cycles in terrestrial environments is nowhere more apparent than in urban landscapes. Trace metals, collected on roadways and transported by storm water, may contaminate soils and sediments associated with storm water management systems. These systems will accumulate metals and associated sediments may reach...
Evaluation of methods for attaching PIT tags and biotelemetry devices to freshwater mussels
S.P. Young, J. Jeffery Isely
2008, Molluscan Research (28) 175-178
We evaluated methods to attach PIT tags and transmitters to freshwater mussels. Mussels received externally-mounted PIT tags using cyanoacrylate or underwater epoxy, and a sub-group of those with PIT tags attached using cyanoacrylate also received dummy transmitters. Tag retention and survival were 100% after a 30 day laboratory observation period...
Red shiner invasion and hybridization with blacktail shiner in the upper Coosa River, USA
D.M. Walters, M.J. Blum, Brenda Rashleigh, B. J. Freeman, B.A. Porter, N.M. Burkhead
2008, Biological Invasions (10) 1229-1242
Human disturbance increases the invasibility of lotic ecosystems and the likelihood of hybridization between invasive and native species. We investigated whether disturbance contributed to the invasion of red shiner (Cyprinella lutrensis) and their hybridization with native blacktail shiner (C. venusta stigmatura) in the Upper Coosa River System (UCRS). Historical records...
Devonian brachiopods of southwesternmost laurentia: Biogeographic affinities and tectonic significance
A. J. Boucot, Forrest G. Poole, R. Amaya-Martinez, A. G. Harris, Charles Sandberg, William R. Page
2008, Special Paper of the Geological Society of America 77-97
Three brachiopod faunas discussed herein record different depositional and tectonic settings along the southwestern margin of Laurentia (North America) during Devonian time. Depositional settings include inner continental shelf (Cerros de Los Murcielagos), medial continental shelf (Rancho Placeritos), and offshelf continental rise (Rancho Los Chinos). Ages of Devonian brachiopod faunas include...
Alaska's Pavlof volcano ends 11-year repose
Christopher F. Waythomas, Stephanie Prejean, Stephen R. McNutt
2008, Eos, Transactions, American Geophysical Union (89) 209-211
After an 11‐year period of repose, Pavlof volcano on the Alaska Peninsula (Figure 1) began an episode of Strombolian eruption lasting 31 days, from 14 August to 13 September 2007.The eruption began abruptly on 14 August after a minor increase in seismicity the previous day. Nearly continuous lava fountaining, explosions,...
Dike orientations in the late jurassic independence dike swarm and implications for vertical-axis tectonic rotations in eastern California
R.F. Hopson, John W. Hillhouse, K. A. Howard
2008, Special Paper of the Geological Society of America 481-498
Analysis of the strikes of 3841 dikes in 47 domains in the 500-km-long Late Jurassic Independence dike swarm indicates a distribution that is skewed clockwise from the dominant northwest strike. Independence dike swarm azimuths tend to cluster near 325?? ?? 30??, consistent with initial subparallel intrusion along much of the...
Nesting biology of Lesser Canada Geese, Branta canadensis parvipes, along the Tanana River, Alaska
Craig R. Ely, John M. Pearce, Roger W. Ruess
2008, Canadian Field-Naturalist (122) 29-33
Lesser Canada Geese (Branta canadensis parvipes) are widespread throughout interior regions of Alaska and Canada, yet there have been no published studies documenting basic aspects of their nesting biology. We conducted a study to determine reproductive parameters of Lesser Canada Geese nesting along the Tanana River near the city of...
It's the land use not the fuels: fires and land development in southern California
Stephanie Pincetl, Philip W. Rundel, Julie Clark De Blasio, Dan Silver, Tom Scott, Jon E. Keeley, Richard W. Halsey
2008, Real Estate Review (37) 25-42
No abstract available....
An evaluation of the evolution of the latest miocene to earliest pliocene bouse lake system in the lower Colorado river valley, southwestern USA
J.E. Spencer, P. A. Pearthree, P.K. House
2008, Conference Paper, Special Paper of the Geological Society of America
The upper Miocene to lower Pliocene Bouse Formation in the lower Colorado River trough of the American Southwest was deposited in three basins - from north to south, the Mohave, Havasu, and Blythe Basins - that were formed by extensional fault ing in the early to middle Miocene. Fossils of...
The importance of hydrology in restoration of bottomland hardwood wetland functions
R.G. Hunter, S.P. Faulkner, K.A. Gibson
2008, Wetlands (28) 605-615
Bottomland hardwood (BLH) forests have important biogeochemical functions and it is well known that certain structural components, including pulsed hydrology, hydric soils, and hydrophytic vegetation, enhance these functions. It is unclear, however, how functions of restored BLH wetlands compare to mature, undisturbed wetlands. We measured a suite of structural and...
Diet and foraging of Rana sauteri and Bufo bankorensis tadpoles in subtropical Taiwanese streams
Hong-Chuan Chen, Bo-Chi Lai, Gary M. Fellers, Wei-Lung Wang, Yeong-Choy Kam
2008, Zoological Studies (47) 685-696
No abstract available....
