Oxidation of methyl halides by the facultative methylotroph strain IMB-1
J.K. Schaefer, R.S. Oremland
1999, Applied and Environmental Microbiology (65) 5035-5041
Washed cell suspensions of the facultative methylotroph strain IMB-1 grown on methyl bromide (MeBr) were able to consume methyl chloride (MeCl) and methyl iodide (MeI) as well as MeBr. Consumption of >100 μM MeBr by cells grown on glucose, acetate, or monomethylamine required induction. Induction was inhibited by chloramphenicol. However,...
Elastic-wave velocity in marine sediments with gas hydrates: Effective medium modeling
M.B. Helgerud, J. Dvorkin, A. Nur, A. Sakai, T. Collett
1999, Geophysical Research Letters (26) 2021-2024
We offer a first-principle-based effective medium model for elastic-wave velocity in unconsolidated, high porosity, ocean bottom sediments containing gas hydrate. The dry sediment frame elastic constants depend on porosity, elastic moduli of the solid phase, and effective pressure. Elastic moduli of saturated sediment are calculated from...
The potential role of natural tumor promoters in marine turtle fibropapillomatosis
Jan H. Landsberg, G.H. Balazs, K.A. Steidinger, D.G. Baden, Thierry M. Work, D.J. Russel
1999, Journal of Aquatic Animal Health (11) 199-210
Fibropapillomatosis (FP) in green turtles Chelonia mydas is a debilitating, neoplastic disease that has reached worldwide epizootic levels. The etiology of FP is unknown but has been linked to oncogenic viruses. Toxic benthic dinoflagellates (Prorocentrum spp.) are not typically considered tumorigenic agents, yet they have a worldwide distribution and produce...
Emerging infectious diseases and amphibian population declines
Peter Daszak, Lee Berger, Andrew A Cunningham, A. D. Hyatt, D. Earl Green, R. Speare
1999, Emerging Infectious Diseases (5) 735-748
We review recent research on the pathology, ecology, and biogeography of two emerging infectious wildlife diseases, chytridiomycosis and ranaviral disease, in the context of host-parasite population biology. We examine the role of these diseases in the global decline of amphibian populations and propose hypotheses for the origins and impact of...
Use of cosmogenic 35S for comparing ages of water from three alpine-subalpine basins in the Colorado Front Range
J.K. Sueker, J.T. Turk, R. L. Michel
1999, Geomorphology (27) 61-74
High-elevation basins in Colorado are a major source of water for the central and western United States; however, acidic deposition may affect the quality of this water. Water that is retained in a basin for a longer period of time may be less impacted by acidic deposition. Sulfur-35 (35S), a...
Autocorrelation of location estimates and the analysis of radiotracking data
David L. Otis, Gary C. White
1999, Journal of Wildlife Management (63) 1039-1044
The wildlife literature has been contradictory about the importance of autocorrelation in radiotracking data used for home range estimation and hypothesis tests of habitat selection. By definition, the concept of a home range involves autocorrelated movements, but estimates or hypothesis tests based on sampling designs that predefine a time frame...
Evolution of Cupido and Coahuila carbonate platforms, early Cretaceous, northeastern Mexico
Christoph Lehmann, David A. Osleger, Isabel P. Montanez, William V. Sliter, Annie Arnaud Vanneau, Jay L. Banner
1999, Geological Society of America Bulletin (111) 1010-1029
The Cupido and Coahuila platforms of northeastern Mexico are part of the extensive carbonate platform system that rimmed the ancestral Gulf of Mexico during Barremian to Albian time. Exposures of Cupido and Coahuila lithofacies in several mountain ranges spanning an ∼80000 km2 area reveal information about platform morphology and composition, paleoenvironmental...
A historical perspective and critique of the declining amphibian crisis
R. Bruce Bury
1999, Wildlife Society Bulletin (27) 1064-1068
Losses of amphibian species and populations are of global concern (Blaustein and Wake 1990, Wyman 1990, Wake 1991, Vial and Saylor 1993, Blaustein 1994) and have been the focus of an increasing number of studies. Still, neither all regions nor all species have declines (Dodd 1997; Green 197; Corn, in...
Alien annual grasses and fire in the Mojave Desert
M.L. Brooks
1999, Madroño (46) 13-19
No abstract available....
Estimating Transmissivity from the Water Level Fluctuations of a Sinusoidally Forced Well
E. Mehnert, A.J. Valocchi, M. Heidari, S.G. Kapoor, P. Kumar
1999, Groundwater (37) 855-860
The water levels in wells are known to fluctuate in response to earth tides and changes in atmospheric pressure. These water level fluctuations can be analyzed to estimate transmissivity (T). A new method to estimate transmissivity, which assumes that the atmospheric pressure varies in a...
Multiple stresses from a single agent: Diverse responses to the experimental acidification of Little Rock Lake, Wisconsin
T.M. Frost, P.K. Montz, T.K. Kratz, T. Badillo, P.L. Brezonik, M.J. Gonzalez, R.G. Rada, C.J. Watras, K.E. Webster, J.G. Wiener, C.E. Williamson, D.P. Morris
1999, Limnology and Oceanography (44) 784-794
A single stress, acidification with sulfuric acid, was applied to Little Rack Lake in a whole-ecosystem manipulation. We documented a wide range of responses to the acidification, including increases in the concentrations of various chemicals, shifts in microbial processes and a major increase in water clarity to UV-B radiation. Each...
A bridging study for oxytetracycline in the edible fillet of rainbow trout: Analysis by a liquid chromatographic method and the official microbial inhibition assay
G. R. Stehly, W.H. Gingerich, C.R. Kiessling, J.H. Cutting
1999, Journal of AOAC International (82) 866-870
Oxytetracycline (OTC) is a drug approved by the U.S. Food and Drug Administration (FDA) to control certain diseases in salmonids and catfish. OTC is also a likely control agent for diseases of other fish species and for other diseases of salmonids and catfish not currently on the label. One...
Factors controlling the establishment of Fremont cottonwood seedlings on the Upper Green River, USA
David J. Cooper, David M. Merritt, Douglas C. Andersen, Rodney A. Chimner
1999, Regulated Rivers: Research & Management (15) 419-440
Declines in cottonwood (Populus spp.) recruitment along alluvial reaches of large rivers in arid regions of the western United States have been attributed to modified flow regimes, lack of suitable substrate, insufficient seed rain, and increased interspecific competition. We evaluated whether and how these factors were operating during 1993–1996 to influence...
Exploring the correlation between Southern Africa NDVI and Pacific sea surface temperatures: Results for the 1998 maize growing season
James P. Verdin, Chris Funk, Robert W. Klaver, D. Roberts
1999, International Journal of Remote Sensing (20) 2117-2124
Several studies have identified statistically significant correlations between Pacific sea surface temperature anomalies and NDVI anomalies in Southern Africa. The potential predictive value of the relationship was explored for the 1998 maize growing season. Cross-validation techniques suggested a more useful relationship for regions of wet anomaly than for regions of...
Seafloor environments in the Long Island Sound estuarine system
H.J. Knebel, R. P. Signell, R.R. Rendigs, L.J. Poppe, J. H. List
1999, Marine Geology (155) 277-318
Four categories of modern seafloor sedimentary environments have been identified and mapped across the large, glaciated, topographically complex Long Island Sound estuary by means of an extensive regional set of sidescan sonographs, bottom samples, and video-camera observations and supplemental marine-geologic and modeled physical-oceanographic data. (1) Environments of erosion or nondeposition...
The relative importance of light and nutrient limitation of phytoplankton growth: A simple index of coastal ecosystem sensitivity to nutrient enrichment
J. E. Cloern
1999, Aquatic Ecology (33) 3-16
Anthropogenic nutrient enrichment of the coastal zone is now a well-established fact. However, there is still uncertainty about the mechanisms through which nutrient enrichment can disrupt biological communities and ecosystem processes in the coastal zone. For example, while some estuaries exhibit classic symptoms of acute eutrophication, including enhanced production of...
Conservation endocrinology: A noninvasive tool to understand relationships between carnivore colonization and ecological carrying capacity
J. Berger, J.W. Testa, T. Roffe, S.L. Monfort
1999, Conservation Biology (13) 980-989
Reproductive technology, especially the diagnosis of pregnancy by radioimmunoassay of fecal steroid metabolites, is an important component of captive propagation, but its role in our understanding of ecological interactions and in situ biological restoration has been more limited. Where large herbivores have been 'released' from predation by the extirpation of...
Deep-sea ostracode species diversity: Response to late Quaternary climate change
T. M. Cronin, D.M. DeMartino, Gary S. Dwyer, J. Rodriguez-Lazaro
1999, Marine Micropaleontology (37) 231-249
Late Quaternary ostracode assemblages from the North Atlantic Ocean were studied to establish the effect of climatic changes of the past 210,000 yr (marine oxygen isotope stages 7–1) on deep-sea benthic biodiversity and faunal composition. Two-hundred and twenty five samples from the Chain 82-24 Core 4PC (41°43′N, 32°51′W, 3427 m...
Cross-well slug testing in unconfined aquifers: A case study from the Sleepers River Watershed, Vermont
Kenneth Belitz, W. Dripps
1999, Ground Water (37) 438-447
Normally, slug test measurements are limited to the well in which the water level is perturbed. Consequently, it is often difficult to obtain reliable estimates of hydraulic properties, particularly if the aquifer is anisotropic or if there is a wellbore skin. In this investigation, we use partially penetrating stress and...
Cooling rates and crystallization dynamics of shallow level pegmatite-aplite dikes, San Diego County, California
Karen L. Webber, William B. Simmons, Alexander U. Falster, Eugene E. Foord
1999, American Mineralogist (84) 708-717
Pegmatites of the Pala and Mesa Grande Pegmatite Districts, San Diego County, California are typically thin, sheet-like composite pegmatite-aplite dikes. Aplitic portions of many dikes display pronounced mineralogical layering referred to as "line rock," characterized by fine-grained, garnet-rich bands alternating with albite- and quartz-rich bands. Thermal modeling was performed for...
Geochemistry of Florida Bay sediments: Nutrient history at five sites in eastern and central Florida Bay
W. H. Orem, C. W. Holmes, C. Kendall, H.E. Lerch, A. L. Bates, S. R. Silva, A. Boylan, M. Corum, M. Marot, C. Hedgman
1999, Journal of Coastal Research (15) 1055-1071
Recent seagrass dieoff and massive microalgal blooms have focused attention on the health of the Florida Bay ecosystem. Changes in nutrient input and the nutrient dynamics of Florida Bay are hypothesized to be linked to these problems, but crucial baseline information is still lacking. Efforts to restore Florida Bay to...
Increasing reactivity of Illinois coal for use in IGCC processes
A.A. Lizzio
1999, ACS Division of Fuel Chemistry, Preprints (44) 699-703
[No abstract available]...
Observations of turbulence in a partially stratified estuary
M.T. Stagey, Stephen G. Monismith, J.R. Burau
1999, Journal of Physical Oceanography (29) 1950-1970
The authors present a field study of estuarine turbulence in which profiles of Reynolds stresses were directly measured using an ADCP throughout a 25-h tidal day. The dataset that is discussed quantifies turbulent mixing for a water column in northern San Francisco Bay that experiences a sequence of states that...
Selenium isotope ratios as indicators of selenium sources and oxyanion reduction
T.M. Johnson, M.J. Herbel, T.D. Bullen, P.T. Zawislanski
1999, Geochimica et Cosmochimica Acta (63) 2775-2783
Selenium stable isotope ratio measurements should serve as indicators of sources and biogeochemical transformations of Se. We report measurements of Se isotope fractionation during selenate reduction, selenite sorption, oxidation of reduced Se in soils, and Se volatilization by algae and soil samples. These results, combined with previous work with Se...
Temporal trends of bulk precipitation and stream water chemistry (1977-1997) in a small forested area, Krusne hory, northern Bohemia, Czech Republic
N.E. Peters, J. Cerny, M. Havel, R. Krejci
1999, Hydrological Processes (13) 2721-2741
The Krusne hory (Erzgebirge or Ore Mountains) has been heavily affected by high atmospheric pollutant deposition caused by fossil fuel combustion in an adjacent Tertiary coal basin. Long-term routine sampling of bulk precipitation (1977-1996) and stream water (1977-1998) in a forested area on the south-eastern slope of the mountains were...
