Two new species of Acestridium (Siluriformes: Loricariidae) from southern Venezuela, with observations on camouflage and color change
Michael E. Retzer, Leo G. Nico, Francisco Provenzano
1999, Ichthyological Exploration of Freshwaters (10) 313-326
No abstract available....
Chlorine-bearing amphiboles from the Fraser mine, Sudbury, Ontario, Canada: Description and crystal chemistry
K.A. McCormick, A.M. McDonald
1999, Canadian Mineralogist (37) 1385-1403
Three chemically distinct populations of Cl-bearing amphibole have been recognized in association with contact Ni-Cu ore deposits in Footwall Breccia at the Fraser mine, Sudbury, Ontario. The first population, defined as halogen-poor (<0.5 wt.% Cl) actinolite and magnesiohornblende, occurs predominantly as pale green grains and cores. These are generally overgrown...
Immunostimulants in fish diets
A.L. Gannam, R. M. Schrock
1999, Journal of Applied Aquaculture (9) 53-89
Various immunostimulants and their methods of application in fish culture are examined in this review. Important variables such as life stage and innate disease resistance of the fish; immunostimulant used, its structure and mode of action; and the fish's environment are discussed. Conflicting results have been published about the efficacy...
Seasonal movements, migration, and range sizes of subadult and adult Bamforth Lake California Gulls
B.H. Pugesek, K.L. Diem, C.L. Cordes
1999, Waterbirds (22) 29-36
We investigated seasonal migration patterns of three age classes of California Gulls (Larus californicus). Using band recovery data and reported sightings of patagially marked gulls, we constructed location maps for fledglings, one to two-year-old gulls, and breeding-age adult gulls during five time periods: spring migration, breeding season, early and late...
Compilation of gas geochemistry and isotopic analyses from The Geysers geothermal field: 1978-1991
Jacob B. Lowenstern, Cathy Janik, Lynne Fahlquist, Linda S. Johnson
1999, Geothermal Resources Council Transactions (23) 383-390
We present 45 chemical and isotopic analyses from well discharges at The Geysers geothermal field and summarize the most notable geochemical trends. H2 and H2S concentrations are highest in the Southeast Geysers, where steam samples have δD and δ18O values that reflect replenishment by meteoric water. In the Northwest Geysers,...
The new england coastal basins national water quality assessment study - Activities and initial results
Kelly F. Robinson
1999, Conference Paper, NCASI Proceedings
[No abstract available]...
Spatial variability of turbulent fluxes in the roughness sublayer of an even-aged pine forest
G. Katul, C.-I. Hsieh, D. Bowling, K. Clark, N. Shurpali, A. Turnipseed, J. Albertson, K. Tu, D. Hollinger, B. M. Evans, B. Offerle, D. Anderson, D. Ellsworth, C. Vogel, R. Oren
1999, Boundary-Layer Meteorology (93) 1-28
The spatial variability of turbulent flow statistics in the roughness sublayer (RSL) of a uniform even-aged 14 m (= h) tall loblolly pine forest was investigated experimentally. Using seven existing walkup towers at this stand, high frequency velocity, temperature, water vapour and carbon dioxide concentrations were measured at 15.5...
Steady-state flow of solid CO2: Preliminary results
William B. Durham, Stephen H. Kirby, Laura A. Stern
1999, Geophysical Research Letters (26) 3493-3496
To help answer the question of how much solid CO2 exists in the Martian south polar cap, we performed a series of laboratory triaxial deformation experiments at constant displacement rate in compression on jacketed cylinders of pure, polycrystalline CO2. Test conditions were temperatures 150 < T < 190 K, hydrostatic...
Movement patterns and population characteristics of the Karner blue butterfly (Lycaeides melissa samuelis) at Indiana Dunes National Lakeshore
Randy L. Knutson, John R. Kwilosz, Ralph Grundel
1999, Natural Areas Journal (19) 109-120
We conducted a three-year mark-release-recapture study of the endangered Karner blue butterfly (Lycaeides melissa samuelis Nabokov) at Indiana Dunes National Lakeshore to describe the butterfly's movement patterns and to assess seasonal changes in the Karner blue's population structure. Estimated mean Karner blue adult life span was less than 3.5 days....
Natural attenuation of chloroacetinilide herbicides in aquatic systems
David W. Graham, William H. Graham, Frank DeNoyelles Jr., Val H. Smith, E. Michael Thurman
Andrea Leeson, Bruce C. Alleman, editor(s)
1999, Conference Paper, Natural attenuation of chlorinated solvents, petroleum hydrocarbons, and other organic compounds: Volume 5(1) of <i>Proceedings from the Battelle Memorial Institute international in situ and on-site bioreclamation symposium</i>
Chloroacetanilide herbicides (e.g. alachlor and metolachlor) and their breakdown products are frequently found in agriculturally impacted and other natural waters. Although these compounds are usually present at low concentrations in aquatic systems, defining their fate and attenuation rate is important because they can be toxic at comparatively low exposure levels....
Seismic- and well-log-inferred gas hydrate accumulations on Richards Island
T. S. Collett
1999, Bulletin of the Geological Survey of Canada 357-376
The gas hydrate stability zone is areally extensive beneath most of the Mackenzie Delta-Beaufort Sea region, with the base of the gas hydrate stability zone more than 1000 m deep on Richards Island. In this study, gas hydrate has been inferred to occur in nine Richards Island exploratory wells on...
Growth of a post-Little Ice Age submarine fan, Glacier Bay, Alaska
P.R. Carlson, E. A. Cowan, R.D. Powell, J. Cai
1999, Geo-Marine Letters (19) 227-236
A small Holocene fan is forming where Queen Inlet, a hanging valley, enters West Arm fjord, Glacier Bay, Alaska. Queen fan formed in the last 80 years following retreat of the Little Ice Age glacier that filled Glacier Bay about 200 yr BP. It was built mainly by a turbidite...
Deformation across the Alaska-Aleutian Subduction Zone near Kodiak
J.C. Savage, J. L. Svarc, W.H. Prescott
1999, Geophysical Research Letters (26) 2117-2120
The Kodiak-Katmai geodetic array, nine monuments distributed along a profile trending north-northwestward across Kodiak Island and the Alaska Peninsula, was surveyed in 1993, 1995 and 1997 to determine the deformation at the Alaska-Aleutian subduction zone. Velocities on Kodiak island measured relative to the stable North American...
Design and production of an atlas for diplomacy in Zimbabwe and the Southern African Development Community
T.W. Crawford Jr., Charles R. Larson, Brian J. Granneman, Gayla A. Evans, Carolyn Gacke, D.R. Pearson
1999, Geocarto International (14) 58-69
An atlas of Zimbabwe and the Southern African Development Community was designed and produced for use by American diplomats in Zimbabwe. Two copies of the bound atlas are used by the Embassy of the United States of America (U.S. Embassy) and the Mission of the U.S. Agency for International Development...
Estimation of Renyi exponents in random cascades
Brent M. Troutman, Aldo V. Vecchia
1999, Bernoulli (5) 191-207
We consider statistical estimation of the Re??nyi exponent ??(h), which characterizes the scaling behaviour of a singular measure ?? defined on a subset of Rd. The Re??nyi exponent is defined to be lim?????0 [{log M??(h)}/(-log ??)], assuming that this limit exists, where M??(h) = ??i??h(??i) and, for ??>0, {??i} are...
Effects of temporal variability in ground data collection on classification accuracy
G. A. Hoch, Jack F. Cully Jr.
1999, Geocarto International (14) 7-14
This research tested whether the timing of ground data collection can significantly impact the accuracy of land cover classification. Ft. Riley Military Reservation, Kansas, USA was used to test this hypothesis. The U.S. Army's Land Condition Trend Analysis (LCTA) data annually collected at military bases was used to ground truth...
Extirpation and recolonization in a metapopulation of an endangered fish, the tidewater goby
K. D. Lafferty, C. C. Swift, R.F. Ambrose
1999, Conservation Biology (13) 1447-1453
The tidewater goby (Eucyclogobius newberryi), an endangered species in the United States, occurs in a series of isolated coastal wetlands in California. Using historical presence-absence data and our own surveys, we estimated annual rates of extirpation and recolonization for several populations of the goby in southern California. As predicted, large...
Using multiple-polarization L-band radar to monitor marsh burn recovery
Elijah W. Ramsey III, G.A. Nelson, S.K. Sapkota, S.C. Laine, J. Verdi, S. Rrasznay
1999, IEEE Transactions on Geoscience and Remote Sensing (37) 635-639
Aircraft L-band VV-, HH-, and VH-polarizations were examined as tools for monitoring burn recovery in a coastal marsh. Significant relationships were observed between time-since-burn (difference between burn and image collection dates; 550-900 days after burn) and returns related to all polarizations. As marsh burn recovery progressed, VV returns decreased while...
Slip-parallel seismic lineations on the Northern Hayward Fault, California
F. Waldhauser, W.L. Ellsworth, A. Cole
1999, Geophysical Research Letters (26) 3525-3528
A high-resolution relative earthquake location procedure is used to image the fine-scale seismicity structure of the northern Hayward fault, California. The seismicity defines a narrow, near-vertical fault zone containing horizontal alignments of hypocenters extending along the fault zone. The lineations persist over...
Analysis of difference between direct and geodetic mass balance measurements at South Cascade Glacier, Washington
R. M. Krimmel
1999, Geografiska Annaler, Series A: Physical Geography (81) 653-658
Net mass balance has been measured since 1958 at South Cascade Glacier using the ‘direct method,’ e.g. area averages of snow gain and firn and ice loss at stakes. Analysis of cartographic vertical photography has allowed measurement of mass balance using the ‘geodetic method’ in 1970, 1975,...
Rate of disappearance of gas bubble trauma signs in juvenile salmonids
K.M. Hans, M.G. Mesa, A.G. Maule
1999, Journal of Aquatic Animal Health (11) 383-390
To assess the rate of disappearance of gas bubble trauma (GBT) signs in juvenile salmonids, we exposed spring chinook salmon Oncorhynchus tshawytscha and steelhead O. mykiss to water containing high levels of dissolved gas supersaturation (DGS) for a time period sufficient to induce signs of GBT, reduced the DGS to...
Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. E. Little, S.B. Jones
1999, Conference Paper, ASTM Special Technical Publication
We measured locomotory behaviors (distance traveled, speed, tortuosity of path, and rate of change in direction) with computer-assisted analysis in 30 day posthatch rainbow trout (Oncorhynchus mykiss) exposed to pesticides. We also examined cholinesterase inhibition as a potential endpoint linking physiology and behavior. Sublethal exposure to chemicals often causes changes...
The strain in the array is mainly in the plane (waves below ~1 Hz)
J. Gomberg, G. Pavlis, P. Bodin
1999, Bulletin of the Seismological Society of America (89) 1428-1438
We compare geodetic and single-station methods of measuring dynamic deformations and characterize their causes in the frequency bands 0.5-1.0 Hz and 4.0-8.0 Hz. The geodetic approach utilizes data from small-aperture seismic arrays, applying techniques from geodesy. It requires relatively few assumptions and a priori information....
Expansion of forest stands into tundra in the Noatak National Preserve, northwest Alaska
F. Suarez, Dan Binkley, Margot W. Kaye, R. Stottlemyer
1999, Écoscience (6) 465-470
Temperatures across the northern regions of North America have been increasing for 150 years, and forests have responded to this increase. In the Noatak National Preserve in Alaska, white spruce (Picea glauca [Moench] Voss) forests reach their northern limit, occurring primarily on well-drained sites and as gallery forests along streams....
Evaluation of reforestation in the Lower Mississippi River Alluvial Valley
S.L. King, B. D. Keeland
1999, Restoration Ecology (7) 348-359
Only about 2.8 million ha of an estimated original 10 million ha of bottomland hardwood forests still exist in the Lower Mississippi River Alluvial Valley (LMAV) of the United States. The U.S. Fish and Wildlife Service, the U.S. Forest Service, and state agencies initiated reforestation efforts in the late 1980s...
