Decadal and annual changes in biogenic opal and carbonate fluxes to the deep Sargasso Sea
W.G. Deuser, T.D. Jickells, Judith A. Commeau
1995, Deep Sea Research Part A, Oceanographic Research Papers (42) 1923-1932
Analyses of samples from a 14-year series of sediment-trap deployments in the deep Sargasso Sea reveal a significant trend in the ratio of the sinking fluxes of biogenic calcium carbonate and silica. Although there are pronounced seasonal cycles for both flux components, the overall opal/CaCO3 ratio changed by 50% from 1978...
Morpholoy and stratal geometry of the Anarctic continental shelf: insights from models
Uri S. ten Brink, Christopher Schneider, Aaron H. Johnson
Alan K. Cooper, Peter F. Barker, Giuliano Brancolini, editor(s)
1995, Book chapter, Geology and seismic stratigraphy of the Anarctic margin
No abstract available....
Reproduction and early-age survival of manatees at Blue Spring, Upper St. Johns River, Florida
Thomas J. O'Shea, W.C. Hartley
Thomas J. O'Shea, B.B. Ackerman, H. Franklin Percival, editor(s)
1995, Report, Population biology of the Florida manatee
We summarize reproduction of adults and survival of calves and subadult Florida manatees (Trichechus manatus latirostris) that were identified in winter at Blue Spring on the upper St. Johns River in Florida. Some records span more than 20 years, but most are from 15-year continuous annual observations during winter 1978-79...
The impacts of mobile fishing gear on low topography benthic habitats in the Gulf of Maine (Northwest Atlantic): A preliminary report
Peter J. Auster, Richard J. Malatesta, Richard W. Langton, Les Watling, Andrew N. Shepard, Ivar G. Babb
1995, Report
No abstract available....
Caranigidae
William F. Smith-Vaniz
W. F. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter, V.H. Nien, editor(s)
1995, Book chapter, Guia FAO para la indetificacion de especies para los Pacifico centro-oriental
No abstract available....
Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal
Susan M. Agar, Kim D. Klitgord
1995, Journal of the Geological Society 849-860
New surficial data (field, Landsat TM and topography) define morpho-tectonic domains and rift flank segmentation in the Ol'khon region of the Central Baikal rift. Deformation, drainage and depositional patterns indicate a change in the locus of active extension that may relate to a recent (<l Ma) change in the kinematics...
The ecology of a sandhills population of the eastern narrow-mouthed toad, Gastrophryne carolinensis, during a drought
C.K. Dodd Jr.
1995, Bulletin of the Florida Museum of Natural History (38) 11-41
Abstract not supplied at this time...
Double-crested cormorants along the Upper Mississippi River
E.M. Kirsch
1995, Colonial Waterbirds (18) 131-136
The Upper Mississippi River is an important habitat corridor for migratory birds and other wildlife, and it supports an important commercial and sport fishery. A study was initiated by the U.S. Fish and Wildlife Service in 1991 to describe Double-crested cormorant (Phalacrocorax auritus) distribution and abundance on the Upper Mississippi...
Identification of sex in hatchling loggerhead turtles (Caretta caretta) by analysis of steroid concentrations in chorioallantoic/amniotic fluid
T. S. Gross, D.A. Crain, K.A. Bjorndal, A.B. Bolten, R. Carthy
1995, General and Comparative Endocrinology (99) 204-210
A major difficulty in sea turtle conservation is the inability to nonlethally and noninvasively identify the sex of hatchling sea turtles. Traditional sexing techniques such as plasma sex steroid quantification cannot be applied to hatchlings without sacrificing the hatchlings or utilizing invasive procedures. This paper presents a technique for sexing...
Optimization of a liquid chromatographic method for determination of malachite green and its metabolites in fish tissues
S. M. Plakas, K.R. ELSaid, G. R. Stehly, J.E. Roybal
1995, Journal of AOAC International (78) 1388-1394
A liquid chromatographic (LC) method was adapted and optimized for the determination of malachite green and its metabolites in fish plasma and muscle. Residues in plasma were extracted with acetonitrile, the extract was evaporated to dryness, and residues were resolubilized for LC analysis. Residues in muscle were extracted with...
Nonperiodic eddy pulsations
David M. Rubin, Richard R. McDonald
1995, Water Resources Research (31) 1595-1605
Recirculating flow in lateral separation eddies is typically weaker than main stem flow and provides an effective environment for trapping sediment. Observations of recirculating flow and sedimentary structures demonstrate that eddies pulsate in size and in flow velocity even when main stem flow is steady. Time series measurements of flow...
Pulling the rug out from under California: Seismic images of the Mendocino Triple Junction region
Anne M. Trehu
1995, Eos, Transactions, American Geophysical Union (76) 369-381
The active tectonic regime of northwestern California changes abruptly from transform motion to subduction at the Mendocino Triple Junction. Northward migration of the triple junction has been a major factor in the tectonic history of the continental margin of California since the Oligocene and continues at present. Understanding the effects...
Geological mapping of biological habitats on Georges Bank and Stellwaen Bank, Gulf of Maine region
Page C. Valentine, Eric A. Schmuck
1995, Conference Paper, Workshop proceedings: Applications of side-scan sonar and laser-line systems in fisheries research, Coast Bastion Inn, Nanaimo, British Columbia, Canada, January 20, 1994
No abstract available....
Survival and population size estimation in raptor studies: A comparison of two methods
William R. Gould, Mark R. Fuller
1995, Journal of Raptor Research (29) 256-264
ABSTRACT.--The Jolly-Seber model is a capture-recapture model that can provide less-biased survival and population size estimates than those produced from simple counting procedures. Parameter estimation by simple counts and Jolly-Seber methods are based on certain assumptions that directly determine the validity of estimates. Evuluation of assumptions for parameter estimation is...
Effects of Mycoplasma anatis and cold stress on hatching success and growth of mallard ducklings
M.D. Samuel, Diana R. Goldberg, C. B. Thomas, P. Sharp
1995, Journal of Wildlife Diseases (31) 172-178
We inoculated game-farm mallard (Anas platyrhynchos) eggs and 1-day-old birds with Mycoplasma anatis to determine its effect on hatching success and growth rates of ducklings. Inoculations of eggs reduced hatching success, hatchling size, and duckling growth rates, compared to controls. Intratracheal inoculations of 1-day-old birds did not affect growth rates. Hatchlings and...
Competitive relations between Douglas-fir and Pacific madrone on shallow soils in a Mediterranean climate
Zheng Q. Wang, M. Newton, J. C. Tappeiner II
1995, Forest Science (41) 744-757
A large area of Pacific Coast forests is characterized by shallow soil, with negligible rainfall in the growing season. This study explores water-seeking strategy on such a site. We studied availability of bedrock water and its effects on growth and ecophysiology of 11-yr-old planted Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and...
An automated photo-identification catalog for studies of the life history of the Florida manatee
C.A. Beck, J.P. Reid
1995, Information and Technology Report 1
Abstract not supplied at this time...
Waterfowl diseases: Causes, prevention, and control
Milton Friend, D.H. Cross
1995, Report, Waterfowl Management Handbook
Preventing and controlling disease in waterfowl is a difficult job. Few tools are available to deal with disease in highly mobile, unconfined animal populations, and few managers are trained and experienced in the prevention and control of avian diseases. Furthermore, the geographic distribution, frequency of occurrence, magnitude of losses, and...
Aerial survey as a technique for estimating manatee population size and trend - problems and prospects
L.W. Lefebvre, B.B. Ackerman, Kenneth M. Portier, K. H. Pollock
1995, Information and Technology Report 1
Abstract not supplied at this time...
Seasonal growth and duration of the parasitic life stage of the landlocked sea lamprey (Petromyzon marinus)
Roger A. Bergstedt, William D. Swink
1995, Canadian Journal of Fisheries and Aquatic Sciences (52) 1257-1264
We used lengths and weights of 2367 live parasitic-phase sea lampreys (Petromyzon marinus) collected from Lake Huron, 1984–1990, to calculate their mean size at half-month intervals. Growth in weight was linear during June through September; increments averaged 11.1 g per half month. Growth increased sharply in October to several times the...
Health studies of free-ranging Mojave desert tortoises in Utah and Arizona
V. M. Dickinson, C.R. Schwalbe, T. Duck, J.L. Jarchow
1995, Research Branch Tech 21
No abstract available at this time...
Effects of pulsating flow on current meter performance
Janice M. Fulford
Espey William H.Combs Phil G., editor(s)
1995, Conference Paper, International Water Resources Engineering Conference - Proceedings
Summarized are laboratory tests for current meter response to pulsating flows. Included are results for mechanical and electromagnetic water-current meters that are commonly used for stream gaging. Most of the vertical-axis and horizontal-axis types of mechanical meters that were tested significantly underregistered the mean flow velocity when the magnitude of...
Contributions of the Conservation Reserve Program to populations of breeding birds in North Dakota
Douglas H. Johnson, L.D. Igl
1995, The Wilson Bulletin (107) 709-718
Previous studies have shown that habitat provided by the Conservation Reserve Program (CRP), a feature of the 1985 farm bill, is used by many birds. The present study quantitatively assesses the importance of the CRP by estimating changes in breeding-bird populations of North Dakota projected if CRP land would revert...
Research access to privately owned wetland basins in the prairie pothole region of the United States
David P. Fellows, Thomas K. Buhl
1995, Wetlands (15) 330-335
We describe efforts to obtain access for research to 81 wetland basins on 69 farms in four zones of the Prairie Pothole Region of North Dakota, South Dakota, and Minnesota. Access was obtained to 54% of the farms in areas where land was intensively cropped and 87% of farms in...
The role of microcracking in shear-fracture propagation in granite
Diane E. Moore, D.A. Lockner
1995, Journal of Structural Geology (17) 95-114
Microcracking related to the formation of a laboratory shear fracture in a cylinder of Westerly granite has been investigated using image-analysis computer techniques. Well away from the fracture (farfield), the deformed granite has about twice the crack density (crack length per...
