Comment [on 'Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth’s coldest intervals?, Kennedy et al., Geology 29(5), 442-446]
M.D. Max, William P. Dillon
2002, Geology (30) 762-763
We welcome the evidence noted by Kennedy et al. (2001) for strong methane excursions associated with the cessation of glacial episodes. They identify the carbon in cap carbonates overlying glacial sediments as probably being of biogenic origin and as likely having had a biogenic methane source. These authors suggest that...
Accumulation rate and mixing of shelf sediments in the Monterey Bay National Marine Sanctuary
R.C. Lewis, K.H. Coale, B. D. Edwards, M. Marot, J.N. Douglas, E.J. Burton
2002, Marine Geology (181) 157-169
The distribution of excess 210Pb in 31 sediment cores was used to determine modern (last 100 yr) mass accumulation rates and the depth of sediment mixing on the continental shelf between Pacifica and Monterey, California, USA. Apparent mass accumulation rates average 0.27 g cm-2 yr-1 and range from 0.42 g...
Influence of an extreme high water event on survival, reproduction, and distribution of snail kites in Florida, USA
Robert E. Bennetts, Wiley M. Kitchens, Victoria Dreitz
2002, Wetlands (22) 366-373
Hydrology frequently has been reported as the environmental variable having the greatest influence on Florida snail kite (Rostrhamus sociabilis) populations. Although drought has received the most attention, high-water conditions also have been reported to affect kites. Years of high water generally have been reported to be favorable for nesting, although...
Variations in sediment texture on the northern Monterey Bay National Marine Sanctuary continental shelf
B. D. Edwards
2002, Marine Geology (181) 83-100
The storm-protected continental shelf of Monterey Bay, part of the Monterey Bay National Marine Sanctuary, north-central California, is subject to abundant, episodic sediment input from fluvial sources. North of Monterey Bay, conditions of reduced sediment supply combined with the exposed nature of the shelf provide an effective laboratory for studying...
Operating the EOSDIS at the land processes DAAC managing expectations, requirements, and performance across agencies, missions, instruments, systems, and user communities
T. A. Kalvelage
Barnes W.L., editor(s)
2002, Conference Paper
NASA developed the Earth Observing System (EOS) during the 1990'S. At the Land Processes Distributed Active Archive Center (LP DAAC), located at the USGS EROS Data Center, the EOS Data and Information System (EOSDIS) is required to support heritage missions as well as Landsat 7, Terra, and Aqua. The original...
Estimating water-table change using microgravity surveys during an ASR program in Lancaster, California
J. F. Howle, S.P. Phillips, M. E. Ikehara, P.J. Dillon
2002, Conference Paper, International symposium on Artificial recharge of groundwater
No abstract available. ...
Net ecosystem production: A comprehensive measure of net carbon accumulation by ecosystems
J. T. Randerson, F. S. Chapin III, J.W. Harden, J. C. Neff, M. E. Harmon
2002, Ecological Applications (12) 937-947
The conceptual framework used by ecologists and biogeochemists must allow for accurate and clearly defined comparisons of carbon fluxes made with disparate techniques across a spectrum of temporal and spatial scales. Consistent with usage over the past four decades, we define "net ecosystem production" (NEP) as the net carbon accumulation...
Isotope variations in a Sierra Nevada snowpack and their relation to meltwater
P.V. Unnikrishna, Jeffery J. McDonnell, C. Kendall
2002, Journal of Hydrology (260) 38-57
Isotopic variations in melting snow are poorly understood. We made weekly measurements at the Central Sierra Snow Laboratory, California, of snow temperature, density, water equivalent and liquid water volume to examine how physical changes within the snowpackgovern meltwater δ18O. Snowpack samples were extracted at 0.1 m intervals from ground level to the top of...
Inhibition of erythrocytes δ-aminolevulinic acid dehydratase (ALAD) activity in fish from waters affected by lead smelters
Christopher J. Schmitt, Colleen A. Caldwell, Bill Olsen, Dave Serdar, Mike Coffey
2002, Environmental Monitoring and Assessment (77) 99-119
We assessed the effects on fish of lead (Pb) released to streamsby smelters located in Trail, BC (Canada), E. Helena, MT, Herculaneum, MO, and Glover, MO. Fish were collected by electrofishing from sites located downstream of smelters and from reference sites. Blood from each fish was analyzed for δ-aminolevulinic acid...
High-resolution aeromagnetic mapping of volcanic terrain, Yellowstone National Park
C. A. Finn, L. A. Morgan
2002, Journal of Volcanology and Geothermal Research (115) 207-231
High-resolution aeromagnetic data acquired over Yellowstone National Park (YNP) show contrasting patterns reflecting differences in rock composition, types and degree of alteration, and crustal structures that mirror the variable geology of the Yellowstone Plateau. The older, Eocene, Absaroka Volcanic Supergroup, a series of mostly altered, andesitic volcanic and volcaniclastic rocks...
Cassini/VIMS observations of the moon
G. Belluci, R. H. Brown, V. Formisano, K. H. Baines, J.-P. Bibring, B. J. Buratti, F. Capaccioni, P. Cerroni, R. N. Clark, A. Coradini, D. P. Cruikshank, P. Drossart, R. Jaumann, Y. Langevin, D. L. Matson, T. B. McCord, V. Mennella, E. Miller, R.M. Nelson, P. D. Nicholson, B. Sicardy, Christophe Sotin
2002, Advances in Space Research (30) 1889-1894
In this paper, we present preliminary scientific results obtained from the analysis of VIMS (Visible and Infrared Mapping Spectrometer) lunar images and spectra. These data were obtained during the Cassini Earth flyby in August 1999. Spectral ratios have been produced in order to derive lunar mineralogical maps. Some spectra observed...
Suspended sediment transport on the continental shelf near Davenport, California
J. P. Xu, M. Noble, S.L. Eittreim
2002, Marine Geology (181) 171-193
Suspended sediment transport on the shelves off Santa Cruz and Davenport, California is studied using field measurements and bottom boundary layer modeling. Strong transport events mostly occur during storms in winter; the volume of winter sediment transport is at least one order of magnitude greater than that of summer/spring transport....
Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration
D. H. Schoellhamer
2002, Estuaries (25) 488-495
Suspended sediment concentration (SSC) data from San Pablo Bay, California, were analyzed to compare the basin-scale effect of dredging and disposal of dredged material (dredging operations) and natural estuarine processes. The analysis used twelve 3-wk to 5-wk periods of mid-depth and near-bottom SSC data collected at Point San Pablo every...
Effects of bull elk demographics on age categories of harem bulls
Louis C. Bender
2002, Wildlife Society Bulletin (30) 193-199
Many management strategies for elk (Cervus elaphus) emphasize increasing numbers of mature bulls in the population. These strategies are usually assumed to enhance productivity via increased breeding by mature bulls. I compared age classes of harem bulls during the peak of the rut under 4 bull harvest strategies that resulted...
Predators
Donald D. Young, Thomas R. McCabe, Robert E. Ambrose, Gerald W. Garner, Greg J. Weiler, Harry V. Reynolds, Mark S. Udevitz, Dan J. Reed, Brad Griffith
David C. Douglas, Patricia E. Reynolds, E. B. Rhode, editor(s)
2002, Biological Science Report 2002-0001-6
Calving caribou (Rangifer tarandus) of the Central Arctic herd, Alaska, have avoided the infrastructure associated with the complex of petroleum development areas from Prudhoe Bay to Kuparuk (Cameron et al. 1992, Nellemann and Cameron 1998, and Section 4 of this document). Calving females of the Porcupine caribou herd may similarly...
Historical and modern distributions of benthic foraminifers on the continental shelf of Monterey Bay, California
M. McGann
2002, Marine Geology (181) 115-156
Historical (early 1930s) and modern samples provide a detailed account of the spatial distribution of benthic foraminifers on the continental shelf of Monterey Bay, California. Ten species among a total of 110 present dominated the 110 samples investigated in the historical study. A cluster analysis of the foraminiferal abundances in...
Helping at a Henslow's Sparrow nest in Wisconsin
Michael J. Guzy, Christine A. Ribic, David W. Sample
2002, The Wilson Bulletin (114) 407-409
We document the first reported observation of helping at the nest of a Henslow's Sparrow (Ammodramus henslowii). Video surveillance recorded two unbanded adults (a presumed male and female) and one banded adult male feeding chicks. No intraspecific aggression among the adults was observed....
Demographic consequences of inbreeding and outbreeding in Arnica montana: A field experiment
S.H. Luijten, M. Kery, J.G.B. Oostermeijer, Nijs H.J.C.M. Den
2002, Journal of Ecology (90) 593-603
1. The genetic constitution of populations may significantly affect demography. Founder populations or isolated remnants may show inbreeding depression, while established populations can be strongly adapted to the local environment. Gene exchange between populations can lead to better performance if heterozygosity levels are restored (heterosis), or to reduced performance if...
Radiocarbon dating, chronologic framework, and changes in accumulation rates of holocene estuarine sediments from Chesapeake Bay
Steven M. Colman, P.C. Baucom, J.F. Bratton, T. M. Cronin, J. P. McGeehin, D. Willard, A.R. Zimmerman, P.R. Vogt
2002, Quaternary Research (57) 58-79
Rapidly accumulating Holocene sediments in estuaries commonly are difficult to sample and date. In Chesapeake Bay, we obtained sediment cores as much as 20 m in length and used numerous radiocarbon ages measured by accelarator mass spectrometry methods to provide the first detailed chronologies of Holocene sediment accumulation in the...
Distribution and movement of shortnose sturgeon (Acipenser brevirostrum) in the Chesapeake Bay
S.A. Welsh, M.F. Mangold, J.E. Skjeveland, A.J. Spells
2002, Estuaries (25) 101-104
During a reward program for Atlantic sturgeon (Acipenser oxyrinchus), 40 federally endangered shortnose sturgeon (Acipenser brevirostrum) were captured and reported by commercial fishers between January 1996 and January 2000 from the Chesapeake Bay. Since this is more than double the number of published records of shortnose sturgeon in the Chesapeake...
Hydrocarbons in recent sediment of the Monterey Bay National Marine Sanctuary
K.A. Kvenvolden, F. D. Hostettler, R.W. Rosenbauer, T.D. Lorenson, W.T. Castle, S. Sugarman
2002, Marine Geology (181) 101-113
A complex mixture of hydrocarbons is present in the recent sediment of the Monterey Bay National Marine Sanctuary. Eighteen samples from the continental shelf between San Francisco and Monterey contain aliphatic and aromatic hydrocarbons showing biological contributions from both marine and terrigenous sources, with the terrigenous indicators more pronounced near...
Economic and ecological impacts of abrupt climate change
U.S. National Research Council
2002, Book chapter, Abrupt climate change: Inevitable surprises
Most studies of the potential ecological and economic impacts of climate change and greenhouse warming have focused on scenarios that involve gradual climate change. Accumulating evidence from the paleosciences, however, shows that the patterns of change suggested by projections of future climate change are not representative of past climatic changes...
A comparison of diets of blueback herring (Alosa aestivalis) and threadfin shad (Dorosoma petenense) in a large southeastern U.S. Reservoir
Dana L. Winkelman, Michael J. Van Den Avyle
2002, Journal of Freshwater Ecology (17) 209-221
The objective of this study was to determine dietary overlap between blueback herring and threadfin shad in J. Strom Thrumond Reservoir, South Carolina/Georgia. We also evaluated prey selectivity for each speices and diet differences between two size categories of blueback herring. Diet and zooplankton samples were collected every other month...
Effects of triploid grass carp on aquatic plants, water quality, and public satisfaction in Washington State
Scott A. Bonar, B. Bolding, M. Divens
2002, North American Journal of Fisheries Management (22) 96-105
We investigated effects of triploid grass carp Ctenopharyngodon idella on aquatic macrophyte communities, water quality, and public satisfaction for 98 lakes and ponds in Washington State stocked with grass carp between 1990 and 1995. Grass carp had few noticeable effects on macrophyte communities until 19 months following stocking. After 19...
Residency and movement patterns of wintering Dunlin in the Willamette Valley of Oregon
P.M. Sanzenbacher, S. M. Haig
2002, Condor (104) 271-280
In the winters of 1998-1999 and 1999-2000, we tracked 67 radio-marked Dunlin (Calidris alpina) throughout the complex agricultural landscape of the Willamette Valley of Oregon. Individual birds were tracked across 8-week sampling periods and indicated a high degree of regional fidelity throughout the three winter sampling periods. Birds exhibited varied...
