Tree rings, drought, and the Pueblo abandonment of south-central New Mexico in the 1670s
James A. Parks, Jeffery S. Dean, Julio L. Betancourt
David E. Doyel, Jeffery S. Dean, editor(s)
2006, Book chapter, Environmental change and human adaptation in the American Southwest
No abstract available....
Overview of selected surrogate technologies for continuous suspended-sediment monitoring
J. R. Gray, J. W. Gartner
2006, Conference Paper, Proceedings of the Eighth Federal Interagency Sedimentation Conference (8thFISC), April2-6, 2006, Reno, NV, USA
Surrogate technologies for inferring selected characteristics of suspended sediments in surface waters are being tested by the U.S. Geological Survey and several partners with the ultimate goal of augmenting or replacing traditional monitoring methods. Optical properties of water such as turbidity and optical backscatter are the most commonly used surrogates...
Sand waves of the Golden Gate
Patrick L. Barnard
2006, Report, 2006 Ecosystem Observations, Monterey Bay National Marine Sanctuary
No abstract available....
Mineral resource of the month: bismuth
James F. Carlin Jr.
2006, Geotimes (2006)
Bismuth compounds are most known for their soothing effects on the stomach, wounds and sores. These properties make the compounds an essential part of many medicinal and cosmetic preparations, which until 1930 accounted for about 90 percent of the bismuth used. The subsequent development of low-melting alloys and chemical catalysts...
Highly Pathogenic Avian Influenza Early Detection Data System (HEDDS)
Robert Worrest, F. Joshua Dein
2006, Report
HEDDS offers a unique opportunity for multiagency cooperation for data sharing and visualization....
Exploration review
D.R. Wilburn
2006, Mining Engineering (58) 37-47
This summary of international mineral exploration activities for the year 2005 draws upon available information from literature, industry and U.S. Geological Survey (USGS) specialists. It provides data on exploration budgets by global region and mineral commodity and identifies significant mineral discoveries and exploration target areas. It also discusses government programs...
Mineral resource of the month: diatomite
Alan Founie
2006, Geotimes (2006)
Diatomite is a soft, very fine-grained, siliceous sedimentary rock that is usually very light grey or beige in color. It is very finely porous, very low in density and essentially chemically inert. Rocks containing diatomite are excellent reservoir rocks for hydrocarbons....
Mineral resource of the month: lithium
Joyce A. Ober
2006, Geotimes (2006)
Lithium, the lightest metallic element, is silvery, white and soft, and highly reactive. It is used most frequently in chemical compounds or traded as mineral concentrates. Its thermal properties make it an ideal component in thermal shock-resistant ceramics, and its electrochemical properties make it an ideal material for several types...
Mineral resource of the month: tellurium
Micheal W. George
2006, Geotimes (2006)
Global demand for tellurium has grown significantly in recent years owing to increased use in solar cells in the United States and Europe, thermoelectronics (especially in China) and steelmaking worldwide. Estimated global production, however, has remained relatively unchanged over the same period, while accumulated inventories have been exhausted, leading to...
Mineral of the month: cement
Hendrik G. van Oss
2006, Geotimes (2006)
Hydraulic cement is a virtually ubiquitous construction material that, when mixed with water, serves as the binder in concrete and most mortars. Only about 13 percent of concrete by weight is cement (the rest being water and aggregates), but the cement contributes all of the concrete’s compressional strength. The term...
Ecosystem element cycling
A. David McGuire
Abdel H. El-Shaarawi, Walter W. Piegorsch, editor(s)
2006, Book chapter, Encyclopedia of Environmetrics
Renesting by dusky Canada geese on the Copper River Delta, Alaska
Thomas F. Fondell, J. Barry Grand, David A.W. Miller, R. Michael Anthony
2006, Journal of Wildlife Management (70) 955-964
The population of dusky Canada geese (Branta canadensis occidentalis; hereafter duskies) breeding on the Copper River Delta (CRD), Alaska, USA, has been in long-term decline, largely as a result of reduced productivity. Estimates of renesting rates by duskies may be useful for adjusting estimates of the size of the breeding...
Persistent organic pollutants in Alaskan ringed seal (Phoca hispida) and walrus (Odobenus rosmarus) blubber
John R. Kucklick, Margaret M. Krahn, Paul R. Becker, Barbara J. Porter, Michele M. Schantz, Geoffrey S. York, Todd M. O'Hara, Stephen A. Wise
2006, Journal of Environmental Monitoring (8) 848-854
Since 1987, the Alaska Marine Mammal Tissue Archival Project (AMMTAP) has collected tissues from 18 marine mammal species. Specimens are archived in the National Institute of Standards and Technology's National Biomonitoring Specimen Bank (NIST-NBSB). AMMTAP has collected blubber, liver and/or kidney specimens from a number of ringed seals (Phoca hispida)...
In situ growth of juvenile zebra mussels in a regulated stream
John R. P. French III, S. Jerrine Nichols, Jaquelyn M. Craig, Jeffery D. Allen, M. Glen Black
2006, Journal of Freshwater Ecology (21) 25-30
We investigated the in situ growth of juvenile zebra mussels (Dreissena polymorpha) in a reach of the Huron River (southeast Michigan) below a dam with a control gate that regulates water levels. Growth was significantly different among sample dates over a five-month-long monitoring season. Mean growth of mussels generally decreased...
Molecular phylogeny of Babesia poelea from brown boobies (Sula leucogaster) from Johnston Atoll, Central Pacific
Michael J. Yabsley, Thierry M. Work, Robert A. Rameyer
2006, Journal of Parasitology (92) 423-425
The phylogenetic relationship of avian Babesia with other piroplasms remains unclear, mainly because of a lack of objective criteria such as molecular phylogenetics. In this study, our objective was to sequence the entire 18S, ITS-1, 5.8S, and ITS-2 regions of the rRNA gene and partial ß-tubulin gene of B. poelea,...
Triazines
Timothy S. Gross, R. Heath Rauschenberger
D.O. Norris, J.A. Carr, editor(s)
2006, Book chapter, Endocrine Disruption: Biological Bases for Health Effects in Wildlife and Humans
Abstract not supplied at this time...
Modeling approaches in avian conservation and the role of field biologists
Steven R. Beissinger, J. R. Walters, D.G. Catanzaro, Kimberly G. Smith, J.B. Dunning, Susan M. Haig, Barry Noon, Bradley Stith
2006, Ornithological Monographs (59) iii-56
This review grew out of our realization that models play an increasingly important role in conservation but are rarely used in the research of most avian biologists. Modelers are creating models that are more complex and mechanistic and that can incorporate more of the knowledge acquired by field biologists. Such...
Ice sheets and sea level: response
Jonathan T. Overpeck, Bette L. Otto-Bliesner, Gifford H. Miller, Richard B. Alley, Daniel R. Muhs, Shawn J. Marshall
2006, Science (313) 1044-1045
Reply to the discussion by F. Lagroix and S.K. Banerjee of "Geochemical evidence for the origin of late Quaternary loess in central Alaska"
Daniel R. Muhs, James R. Budahn
2006, Canadian Journal of Earth Sciences (43) 1891-1895
Geochemical data for mercury, methylmercury, and other constituents in sediments from Englebright Lake, California, 2002
Charles N. Alpers, Michael P. Hunerlach, Mark C. Marvin-DePasquale, Ronald C. Antweiler, Brenda K. Lasorsa, John F. De Wild, Noah P. Snyder
2006, Data Series 151
This report presents geochemical data from two 2002 sampling campaigns conducted in Englebright Lake on the Yuba River in northern California. A deep coring campaign was done in May-June 2002 and a shallow sampling campaign was completed in October 2002. This work assessed the chemical composition of material deposited in...
Role of multidecadal climate variability in a range extension of pinyon pine
Stephen T. Gray, Julio L. Betancourt, Stephen T. Jackson, Robert G. Eddy
2006, Ecology (87) 1124-1130
Evidence from woodrat middens and tree rings at Dutch John Mountain (DJM) in northeastern Utah reveal spatiotemporal patterns of pinyon pine (Pinus edulis Engelm.) colonization and expansion in the past millennium. The DJM population, a northern outpost of pinyon, was established by long-distance dispersal (~40 km). Growth of this isolate...
Predicting woodrat (Neotoma) responses to anthropogenic warming from studies of the palaeomidden record
Felisa A. Smith, Julio L. Betancourt
2006, Journal of Biogeography (33) 2061-2076
Aim The influence of anthropogenic climate change on organisms is an area of great scientific concern. Increasingly there is recognition that abrupt climate transitions have occurred over the late Quaternary; studies of these shifts may yield insights into likely biotic responses to contemporary warming. Here, we review research undertaken...
Status of Amphibians in California and Arizona
G. M. Fellers, Robert N. Fisher, C.R. Schwalbe
2006, WERC Fact Sheet -
No abstract available at this time...
Late Quaternary vegetation and climate history of a perennial river canyon in the Rīo Salado basin (22°S) of Northern Chile
Claudio Latorre, Julio L. Betancourt, Mary T.K. Arroyo
2006, Quaternary Research (65) 450-466
Plant macrofossils from 33 rodent middens sampled at three sites between 2910 and 3150 m elevation in the main canyon of the Rīo Salado, northern Chile, yield a unique record of vegetation and climate over the past 22,000 cal yr BP. Presence of low-elevation Prepuna taxa throughout the record suggests...
Classification tree and minimum-volume ellipsoid analyses of the distribution of ponderosa pine in the western USA
Jodi R. Norris, Stephen T. Jackson, Julio L. Betancourt
2006, Journal of Biogeography (33) 342-360
Aim? Ponderosa pine (Pinus ponderosa Douglas ex Lawson & C. Lawson) is an economically and ecologically important conifer that has a wide geographic range in the western USA, but is mostly absent from the geographic centre of its distribution - the Great Basin and adjoining mountain ranges. Much of its...
