Relationship of young-of-the-year northern pike to aquatic vegetation types in backwaters of the upper Mississippi River
L. E. Holland, M.L. Huston
1984, North American Journal of Fisheries Management (4) 514-522
The association of young-of-the-year northern pike (Esox lucius) with different aquatic plant types (e.g., submerged, emergent, floating) was studied to evaluate the impacts of a potential loss of backwaters on available fish nursery habitats in the upper Mississippi River. Eight biweekly collections were made at each of six representative lentic...
Analysis of potential yield per recruit for striped bass produced in Chesapeake Bay
C.P. Goodyear
1984, North American Journal of Fisheries Management (4) 488-496
The yield of striped bass (Morone saxatilis) in biomass and numbers was estimated for constant recruitment of young fish into the population on the basis of vital statistics of the Maryland stock. Separate computations were performed for males, females, and sexes combined. Yield in biomass per individual entering the population...
Projected future abundance of the Yellowstone grizzly bear
R.R. Knight, L.L. Eberhardt
1984, Journal of Wildlife Management (48) 1434-1438
No abstract available....
A comparative ground response study near Los Angeles using recordings of Nevada nuclear tests and the 1971 San Fernando earthquake
A. M. Rogers, Roger D. Borcherdt, P. A. Covington, D. M. Perkins
1984, Bulletin of the Seismological Society of America (74) 1925-1949
A comparative ground response study at sites in the Los Angeles region is based on the extensive strong-motion data set recorded in the 1971 San Fernando earthquake and 159 three-component recordings of distant nuclear tests in Nevada. Amplitude spectral ratios computed for the nuclear...
Survival of juvenile wood ducks in a northern greentree impoundment
G.M. Haramis, D.Q. Thompson
1984, Journal of Wildlife Management (48) 1364-1369
No abstract available. ...
Sedimentary processes on the Atlantic Continental Slope of the United States
Harley J. Knebel
1984, Marine Geology (61) 43-74
Until recently, the sedimentary processes on the United States Atlantic Continental Slope were inferred mainly from descriptive studies based on the bathymetry and on widely spaced grab samples, bottom photographs, and seismic-reflection profiles. Over the past 6 years, however, much additional information has been collected on the bottom morphology, characteristics...
Reevaluation of the systematic position of Scenella
E. L. Yochelson, Cid D. Gil
1984, Lethaia (17) 331-340
Specimens originally illustrated from Lower Cambrian rocks of the Sierra Morena in Badajoz and Sevilla Provinces, southwestern Spain are supplemented by new material from another locality and are described as Scenella morenensis n. sp. Although Scenella was originally considered to be a patelliform gastropod, for three decades now the genus has been classified as...
[Book review] Ecotoxicology: The study of pollutants in ecosystems by F. Moriarity
Gary H. Heinz
1984, Journal of Wildlife Management (48) 1465
No abstract available....
Carbon assimilation characteristics of the aquatic CAM plant Isoetes howellii
Jon E. Keeley, G. Busch
1984, Plant Physiology (76) 525-530
The relationship between malic acid production and carbon assimilation was examined in the submerged aquatic Crassulacean acid metabolism (CAM) plant, Isoetes howellii Engelmann. Under natural conditions free-CO2 level in the water was highest at 0600 hours and 14CO2 assimilation rates in I. howellii were also highest at this time. After 0900 hours there was a similar pattern...
Biology contravenes taxonomy in the Myxozoa: New discoveries show alternation of invertebrate and vertebrate hosts
K. Wolf, M.E. Markiw
1984, Science (225) 1449-1452
For 80 years the infectivity of salmonid whirling disease has eluded discovery. New findings now show that this myxosporean disease of fish is initiated by what is regarded as an actinosporean produced in a tubificid oligochaete. Experimental results provide evidence that, instead of being considered as representatives of separate classes...
Government investment in mineral resource information on leasable public lands: The case of strippable coal
Emil D. Attanasi
1984, Resources and Energy (6) 41-59
A scheme is presented to aid the government in estimating the net benefits, in terms of itsrecovery of expected rents, of performing various levels of exploration of mineral tracts prior to leasing and making such information available to potential bidders. Conditions are identified where the government will profit by investment...
Side-scan sonar assessment of gray whale feeding in the Bering Sea
K.R. Johnson, C.H. Nelson
1984, Science (225) 1150-1152
Side-scan sonar was used to map and measure feeding pits of the California gray whale over 22,000 square kilometers of the northeastern Bering Sea floor. The distribution of pits, feeding whales, ampeliscid amphipods (whale prey), and a fine-sand substrate bearing the amphipods were all closely correlated. The central Chirikov Basin...
Disruption of the terrestrial plant ecosystem at the Cretaceous-Tertiary boundary, western interior
R.H. Tschudy, C. L. Pillmore, C. J. Orth, J. S. Gilmore, J.D. Knight
1984, Science (225) 1030-1032
The palynologically defined Cretaceous-Tertiary boundary in the western interior of North America occurs at the top of an iridium-rich clay layer. The boundary is characterized by the abrupt disappearance of certain pollen species, immediately followed by a pronounced, geologically brief change in the ratio of fern spores to angiosperm pollen....
Population structure of Adenostoma fasciculatum in mature stands of chamise chaparral in the southern Sierra Nevada, California
T.J. Stohlgren, D.J. Parsons, P.W. Rundel
1984, Oecologia (64) 87-91
In the low elevation chaparral areas of Sequoia National Park, California, pure stands of chamise (Adenostoma fasciculatum) are periodically rejuvenated by fire. Mature stands showed considerable variability in density and total biomass even though a positive correlation exists between the two. Mature stands showed a preponderance of individuals in the...
A method for predicting petroleum industry demands associated with future discoveries
Emil D. Attanasi
1984, Journal of Resource Management and Technology (13)
A note on petroleum industry exploration efficiency
Emil D. Attanasi
1984, The Energy Journal (5) 133-146
No abstract available....
Offshore exploration and industry change: The case of the Gulf of Mexico
Emil D. Attanasi, L. J. Drew
1984, Journal of Petroleum Technology (36) 437-442
This paper considers industry structure and the exploration performance (by size class of operator) of firms searching for oil and gas in the U.S. Gulf of Mexico. It also tracks the changes in industry structure that have occurred in response to a decline in the quality of remaining prospects in...
The orientation and navigation of juvenile alligators: evidence of magnetic sensitivity
Gordon H. Rodda
1984, Journal of Comparative Physiology A (154) 649-658
Displaced juvenile alligators, Alligator mississipiensis, were released on land in a 9 m diameter dodecagonal arena to test their ability to orient in the absence of terrestrial landmarks. Navigational ability seemed to improve with age. When displaced along a fairly direct route yearlings (age 7–14 months) compensated for their displacement,...
Organochlorine pesticide, polychlorobiphenyl, and mercury residues in bald eagle eggs – 1969-79 – And their relationships to shell thinning and reproduction
Stanley N. Wiemeyer, Thair Lamont, Christine M. Bunck, C. R. Sindelar, F. J. Gramlich, James D. Fraser, M. A. Byrd
1984, Archives of Environmental Contamination and Toxicology (13) 529-549
Bald eagle (Haliaeetus leucocephalus) eggs were collected in 14 States in 1969–79 and analyzed for organochlorine pesticides, polychlorobiphenyls, and mercury. Moderate shell thinning occurred in eggs from several areas. Eggs from the Chesapeake Bay area contained the highest residue levels of most organochlorines. DDE was detected in all eggs; other...
Age of the Comfort Member of the Castle Hayne Formation, North Carolina
J. E. Hazel, Laurel M. Bybell, Lucy E. Edwards, G. D. Jones, L. W. Ward
1984, GSA Bulletin (95) 1040-1044
The biostratigraphic and chronostratigraphic position of the Comfort Member of the Castle Hayne Formation has been the subject of much debate. At the Martin-Marietta Quarry at Castle Hayne, New Hanover County, North Carolina, the planktic foraminifers indicate an assignment within an interval of the uppermost Turborotalia frontosa Zone to the Turborotalia pomeroli Zone. The...
Development of a predictive irrigation scheduling index using electrophytograms
William G. Gensler
1984, Report, Research project technical completion report 828-05
No abstract available....
Bias-elimination in fish population models with stochastic variation in survival of the young
C.P. Goodyear, S.W. Christensen
1984, Transactions of the American Fisheries Society (113) 627-632
The addition of random variation in survival to a single prereproductive age class in a Leslie matrix population model can alter population growth in the modeled system. Methods are presented to characterize the stochastic variation in survival and to determine a correction factor that, when included in the model, will...
Hydrogen, oxygen, and carbon isotope ratios of cellulose from submerged aquatic Crassulacean acid metabolism and non-Crassulacean acid metabolism plants
L. Sternberg, M. J. DeNiro, Jon E. Keeley
1984, Plant Physiology (76) 68-70
Isotope ratios of cellulose and cellulose nitrate from aquatic Crassulacean acid metabolism (CAM) and non-CAM plants were determined. Cellulose oxygen istope ratios for all plants that grew together were virtually identical, whereas large differences were observed for hydrogen isotope ratios of cellulose nitrate between CAM and non-CAM plants. Carbon isotope...
Spawning by Rhinichthys osculus (Cyprinidae), in the San Francisco River, New Mexico
Gordon A. Mueller
1984, Southwestern Naturalist (29) 354-356
The speckles dace Rhinichthys osculus [Girard] is the most widely distributed and ubiquitous fish in the western United States (Moyle, Inland Fishes of California, 1976). Although common, very little information is available concerning thje reproductive behavior of speckled dace or the environmental cues which trigger spawning activity. Several...
Stylites, a vascular land plant without stomata absorbs CO2 via its roots
Jon E. Keeley, C.B. Osmond, J.A. Raven
1984, Nature (310) 694-695
Photosynthetic organs of most higher plants normally have access to atmospheric CO2 through stomatal pores which also serve as variable valves to control the loss of H2O vapour which accompanies CO2 uptake1. The acquisition of stomata is commonly thought to have been a crucial development permitting ‘conquest’ of land and direct access...
