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Articles 1 - 30 of 72
Full-Text Articles in Life Sciences
Lake Mead Nutrient Enhancement Project, Peter D. Vaux, Larry J. Paulson, Nevada Department Of Wildlife, National Oceanic And Atmospheric Administration
Lake Mead Nutrient Enhancement Project, Peter D. Vaux, Larry J. Paulson, Nevada Department Of Wildlife, National Oceanic And Atmospheric Administration
Publications (WR)
The Lake Mead Fertilization Project is a research program designed to investigate the potential for using large-scale artificial fertilization to enhance the game fisheries of this reservoir through an increase in the population of threadfin shad, the system's primary forage species. A substantial decline in the population of largemouth bass, together with poor condition of adult striped bass, are the two major issues affecting the Lake Mead game fisheries. Both issues have been hypothesized to be a result of an inadequate amount of forage in the reservoir. Previous studies have in turn suggested that a major factor limiting the shad …
The Effects Of Two Polycyclic Aromatic Hydrocarbons Benzo[A]Pyrene And Naphthalene On Reproductive Success Embryological Development Larval Physiology And Mortality Of The Mud Crab Rhithropanopeus Harisii (Gould), Gregory V. White
OES Theses and Dissertations
Polycyclic aromatic hydrocarbons (PAHs) such as naphthalene (Nap) and benzo[a]pyrene (B[a]P) are common in the water column and sediments of estuarine and coastal areas. The mud crab Rhithropanopeus harrisii was exposed to varying concentrations of Nap or B[a]P to determine the effects on reproductive success, embryological development, larval physiology and mortality. Nap and B[a]P decreased hatching success and prolonged embryological development. Both pollutants produced high abnormality frequencies for egg exposed larvae. Molt frequency and respiratory rates of larvae from non-exposed eggs were more chronically affected by these pollutants than were egg exposed larvae. The EC50 concentrations were determined for …
Seasonal And Diel Patterns Of Abundance And Productivity Of Phototrophic Picoplankton In The Lower Chesapeake Bay, Lewis Francis Affronti Jr.
Seasonal And Diel Patterns Of Abundance And Productivity Of Phototrophic Picoplankton In The Lower Chesapeake Bay, Lewis Francis Affronti Jr.
Biological Sciences Theses & Dissertations
This study was performed to evaluate phototrophic pico-plankton (0.2 to 2.0 μm) dynamics within the lower Chesapeake Bay. A 15 month study of phototrophic picoplankton abundance and productivity was made from June 1988 to October 1989. Annual picoplankton abundance using epifluorescence microscopy ranged from 7.26 x 106 cells/1 in the winter to 9.28 x 108 cells/1 during late summer.
In situ incubations of natural picoplankton populations over the 15 month study were used to test the applicability of the frequency of dividing cells technique in estimating phototrophic picoplankton growth rates. The regression equation o fμ = 2.37 x …
Phytoplankton In Lake Drummond And Two Drainage Ditches In The Great Dismal Swamp, Virginia, Christine Gregory Phillips
Phytoplankton In Lake Drummond And Two Drainage Ditches In The Great Dismal Swamp, Virginia, Christine Gregory Phillips
Biological Sciences Theses & Dissertations
A twelve month study was conducted on the phytoplankton of Lake Drummond and Washington and Jericho Ditches from December 1988 to November 1989. Surface water samples were collected for nutrient and chlorophyll analysis from June 1989 to November 1989. The dominant phytoplankton component was the pico-nanoplankton (< 3 micron) category. A total of 57 species were identified from Lake Drummond, 51 species from Washington Ditch, and 31 species from the Jericho Ditch. Three major phytoplankton groups were identified at these sites: bacillariophyceans, cyanophyceans and cryptophyceans. The dominant species was the diatom Asterionella formosa. Nutrient and chlorophyll concentrations increased from summer to fall. Based on nutrient and chlorophyll g concentrations and species diversity indices, Lake Drummond is classified as eutrophic.
Enhancement And Monitoring Of The Procambarus Clarkii Population In Lake Mead, Mikell Beth Hager
Enhancement And Monitoring Of The Procambarus Clarkii Population In Lake Mead, Mikell Beth Hager
Publications (WR)
Procambarus clarkii are found in extremely low numbers throughout Lake Mead, AZ-NV. The crayfish are an important dietary component for game fish. Enhancement of the crayfish population would broaden the fishery forage base. Crayfish were stocked and monitored in a study cove on Saddle Island to determine if the Procambarus clarkii population could be enhanced. A trapping survey of the area after the following reproductive season yielded low numbers of crayfish. A comparison of pre-stocking and post-stocking catch per trap day (CPTD) values revealed no significant increase in the population. Procambarus clarkii growth is limited by environmental factors in Lake …
Slippery Near-Surface Layer Of The Ocean Arising Due To Daytime Solar Heating, Vladimir N. Kudryavtsev, Alexander Soloviev
Slippery Near-Surface Layer Of The Ocean Arising Due To Daytime Solar Heating, Vladimir N. Kudryavtsev, Alexander Soloviev
Marine & Environmental Sciences Faculty Articles
Measurements made in the Equatorial Atlantic during the 35th cruise of the R/V Akademic Vernadsky using a free-rising profiler and drifters revealed a near-surface slippery layer of the ocean arising due to daytime solar heating. The solar heating warms and stabilizes the surface layer of the ocean. This suppresses turbulent exchange and limits the penetration depth of the wind-induced turbulent mixing. The heated near-surface layer is then slipping over the underlying water practically without friction. At daytime warming of 1°C the resistance coefficient in the upper 5-m ocean, Cu = (U*/ΔUs)2 became …
Trophic Interactions Between Fish And Invertebrates In Bear Lake, Utah-Idaho, Wayne A. Wurtsbaugh, Charles P. Hawkins
Trophic Interactions Between Fish And Invertebrates In Bear Lake, Utah-Idaho, Wayne A. Wurtsbaugh, Charles P. Hawkins
Watershed Sciences Faculty Publications
An intensive study of the limnology, invertebrates and fishes of Bear Lake was conducted in 1987 in order to define the productivity and food web of the community. Limno10gica1 parameters and invertebrates were measured at approximately monthly intervals while fish distribution and feeding was analyzed in February, June, August, and October. Samples were collected at three to eight stations along a transect running from the shallow littoral area on the west side of the lake, to the deep profundal zone.
Survival Of Trout Strains As Affected By Limnological Parameters, Wayne A. Wurtsbaugh, Timothy Modde, Chris Luecke, Cheryl Courtney
Survival Of Trout Strains As Affected By Limnological Parameters, Wayne A. Wurtsbaugh, Timothy Modde, Chris Luecke, Cheryl Courtney
Watershed Sciences Faculty Publications
Juvenile rainbow trout Oncorhynchus mykiss. (ca. 80 mm S.L.) stocked into mid-elevation reservoirs in Utah are vulnerable to predation from piscivorous fish and birds. I determined how effectively juvenile trout used cover to avoid these predators by using direct observations (snorkel transects) on habitat selection in two reservoirs. Observations of juvenile trout were conducted within five weeks of stocking in 1988 and 1989. During the day juvenile trout were abundant in complex inshore habitats. Juvenile trout actively fed during the day but the time of peak feeding was variable. Large Daphnia made of > 95% of the diet of juvenile trout. …
Sea Turtle Nesting And Hatching Success In Broward County, Florida, 1989, Catherine A. Mattison, Curtis M. Burney, Louis E. Fisher
Sea Turtle Nesting And Hatching Success In Broward County, Florida, 1989, Catherine A. Mattison, Curtis M. Burney, Louis E. Fisher
Marine & Environmental Sciences Faculty Proceedings, Presentations, Speeches, Lectures
No abstract provided.
The Relationship Of Loggerhead Nesting Patterns And Moon Phase In Broward County, Florida, Curtis M. Burney, Catherine A. Mattison, Louis E. Fisher
The Relationship Of Loggerhead Nesting Patterns And Moon Phase In Broward County, Florida, Curtis M. Burney, Catherine A. Mattison, Louis E. Fisher
Marine & Environmental Sciences Faculty Proceedings, Presentations, Speeches, Lectures
No abstract provided.
Biozonation Of Deep-Water Lithoherms And Associated Hardgrounds In The Northeastern Straits Of Florida, Charles G. Messing, A. Conrad Neumann, Judith C. Lang
Biozonation Of Deep-Water Lithoherms And Associated Hardgrounds In The Northeastern Straits Of Florida, Charles G. Messing, A. Conrad Neumann, Judith C. Lang
Marine & Environmental Sciences Faculty Articles
Elongated carbonate mounds ("lithoherms") oriented parallel to prevailing northerly bottom currents at moderate depths (500-700 m) along the western margin of the Little Bahama Bank exhibit a consistent faunal zonation characterized by attached, suspension-feeding invertebrates. The four most abundant macroepibenthic groups (alcyonarians, crinoids, sponges and stylasterid hydrocorals) dominate all hard substrates examined except upcurrent ends and crests of lithoherms. We recognize three faunal zones on these mounds: a Coral Zone (Lophelia prolifera) restricted to the upcurrent end; a Zoanthid Zone (?Gerardia sp.) along upcurrent crests, and a Crinoid/Alcyonarian Zone along lithoherm flanks and downstream crests. Taxa characteristic of the latter …
Research, Education And "Proper Extension Work" : The First 50 Years Of The Virginia Institute Of Marine Science, William J. Hargis Jr.
Research, Education And "Proper Extension Work" : The First 50 Years Of The Virginia Institute Of Marine Science, William J. Hargis Jr.
Miscellaneous
No abstract provided.
Evaluation And Development Of Pasture Species For Deep Sandy Soils In Low To Medium Rainfall Areas., B. J. Nutt
Evaluation And Development Of Pasture Species For Deep Sandy Soils In Low To Medium Rainfall Areas., B. J. Nutt
Experimental Summaries - Plant Research
Trial 90EC1
Effect of species and maturity on dry matter production and water use of annual medic on deep sandplain soil.
Location: East Chapman.
All medic cultivars were preferentially grazed compared to Paros serradella which did not allow a proper comparison between the two species in the grazed treatment. 2. Poor nodulation in Harbinger due to incompatability with the current Group A inoculant (R. meliloti strain WSM 540) resulted in poor-growth-and-low-seed-yield. - 3. Water use was directly related to maturity or time taken to flower ; total water extraction (mm) = 1.48 * days to flower - 41.1 R2 = …
Economics Of Summer Weed Control., T. Piper
Economics Of Summer Weed Control., T. Piper
Experimental Summaries - Plant Research
Aims: To test various chemical options for summer weed control; measuring their efficacy, the amount of soil moisture conserved, and follow-up crop yield. A full season cost-benefit could then be produced. Summer rains were widespread in 1990, and summer weed sites were plentiful.
Trial 90A3
Location: Avondale.
This site had adequate moisture for most of the summer. Weeds were growing well when sprayed, and were readily controlled. (df. Wongan Hills). 2,4-D/diuron gave excellent control at the time of spraying but follow-up germinations marred the result.
Trial 90M6
Location: Merredin.
All treatments have failed at this site. Large doublegee and melons …
Cranola Rapseed Variety Assessment. Cranola Agronomy. Linseed. Tillage., J. D. Warren
Cranola Rapseed Variety Assessment. Cranola Agronomy. Linseed. Tillage., J. D. Warren
Experimental Summaries - Plant Research
Trial 90AB15. 90N68, 90EB39
Canola : assessment of early maturing Stage 2 lines.
Location: Katanning, Newdegate Research Station, East Beverley Annex
Production of Canola in medium rainfall zones offers the opportunity for a rapid expansion of the industry. However presently recommended varieties take too long to mature for the area's shorter growing season. The Stage 2 trials assess Canola lines selected on the basis of earliness from the remnants of Dr Roy's now defunct rapeseed breeding programme as well as selections from Eastern States breeding programmes. The trials arc conducted at three sites to account for environmental effects on cultivar …
Phosphorus And Sulphur Nutrition Of Pastures In High Rainfall Areas., M. D. Bolland, M. F. Clarke
Phosphorus And Sulphur Nutrition Of Pastures In High Rainfall Areas., M. D. Bolland, M. F. Clarke
Experimental Summaries - Plant Research
J.S.Yeates and M.F.Clarke started these experiments. In January 1990 M.D.A. Bolland replaced J.S. Yeates (who became Regional Manager of the Northern Agricultural Region) as the Research Officer responsible for the management of the long-term experiments, and to continue the research on the topic.
In the experiments the fertilizers wee applied in autumn (March-April) in the years listed in the tables.
Trial 80AL4
Location: Cuthbert.
A new experiment was started in 1989 to compare two partially acidulated rock phosphate (PARP) fertilizers with ordinary (single) superphosphate (OSP).
Trial 84AL32
Location: Denmark
The fertilizers compared are ordinary (single) superphosphate (OSP). New (pre 1990) …
Stunt Patch Disorder Of Lupins., Miles Dracup
Stunt Patch Disorder Of Lupins., Miles Dracup
Experimental Summaries - Plant Research
Trial 89ME1 and 90ME5
Stunt patch disorder of lupins.
Location: Merredin.
Studies on the disorder have been initiated (89ME1 and 90ME5) on two sites 15 km south of Merredin. This report will summarize data on:
1) The soil;
2) Soil strength and lupin emergence on 90ME5; and
3) Soil chemical and physical characteristics associated with the patches on 89ME1 (investigations by A. Thomson for B Sc (Agric) dissertation).
Trial 90PE56
Understanding the importance of moisture and temperature in the seedbed on establishment of lupin.
However, despite their importance in determining the success of establishment, there have been few attempts to …
Leaf Diseases Of Wheat, R. Loughman, Geoff Thomas, J. A. Bathgate, W. R. Smith
Leaf Diseases Of Wheat, R. Loughman, Geoff Thomas, J. A. Bathgate, W. R. Smith
Experimental Summaries - Plant Research
Trial 90PE10
Strategic variety mixtures to reduce septoria diseases of wheat. Evaluation of wheat lines for suitability to mixing for septoria control.
Location: Mt. Barker Research Station
To determine components of partial resistance to both Septoria species to ensure that lines with components that are complimentary are chosen for evaluation as mixtures for Septoria control.
Trial 90MT12 and 90ME10
Assessing effects of a paired variety mixture to reduce Septoria.
Location: Borden and Mt Barker Research Station.
To assess the effects of a variety mixture on Septoria diseases.
Trial 90MT11 and 90JE9
Evaluating variety mixtures to reduce septoria, using a range …
Demonstration Of Pasture Cultivars On Various Soil Types In The Geraldton Distict., Brad Nutt
Demonstration Of Pasture Cultivars On Various Soil Types In The Geraldton Distict., Brad Nutt
Experimental Summaries - Plant Research
Trial 90GE13
Demonstration of pasture cultivars on a Chapman Valley red/brown sandy loam.
Location: Northern Gulley,
SOIL TYPE: Red/brown sandy loam pH 5 . 4 (water)
Trial 90GE14
Demonstration of pasture cultivars on a gravelly grey sand at Allanooka.
Location: Allanooka.
SOIL TYPE: Gravelly grey sand, pH 5.8 (water)
Trial 90GE15
Demonstration of pasture cultivars on an Eradu sandplain soil.
Location: Ogilivie.
SOIL TYPE: Deep yellow loamy sand, pH 6.0 (water)
Trial 90GE16
Demonstration of pasture cultivars on a low rainfall maasive red earth at Mullewa.
Location: Mullewa.
SOIL TYPE: Red sandy clay loam pH 6.2 (water)
Evaluation Of Trifolium Pasture Species On A Summer Moist Joel Sub Soil North West Of Harvey., R. Snowball
Evaluation Of Trifolium Pasture Species On A Summer Moist Joel Sub Soil North West Of Harvey., R. Snowball
Experimental Summaries - Plant Research
Trial 90HA2
Introduce a range of long season annual pasture species and 1 perennial species in order to utilize summer sub soil moisture more effectively than the existing subterranean clover pastures.
Development And Management Of Cattle Pastures In The High Rainfall Zone., Tony Albertsen
Development And Management Of Cattle Pastures In The High Rainfall Zone., Tony Albertsen
Experimental Summaries - Plant Research
Trial 87V8
Development and management of cattle pastures in the high rainfall zone.
To compare the effect of pasture species, pasture management and grazing management on pasture quantity, quality and cattle production.
Phalaris evaluation
In 1989 ninety three lines of Phalaris agrundinacea backcross with P. aquatica, bred by Dr. R.N. Oram (CSIRO Canberra) were drilled sown into unreplicated 10m single row plots at Vasse Research Station. In addition 7 controls (with two replications) were planted. Similar trials were planted by Mr. L. Cransberg (Albany) and Dr. R.N. Oram (Bendigo).
Evaluation of annual and short term rotation ryegrass.
The increasing range …
Effect Of Pasture Species On Pasture Production And Following Cereal Yields On Heavy Textured Soils In Low Rainfall Areas. Regeneration Of Pasture Legume Cultivars On Low Rainfall Red Loam Soils., Bradley Nutt
Experimental Summaries - Plant Research
Trial 90GE17
Aphid tolerance evaluation in annual medics
Location: Tenindewa
Maturity and seed yields of annual medic lines with or with out aphid control using Pirmor.
Trial 90GE116
Evaluation of aphid tolerance in annual medics
Location: Tenindewa
Dry matter and seed yield of annual medic lines with and without aphid control using Pirmor.
Trial 90GE34
Effect of pasture species on pasture production and cereal yields on low rainfall red loams.
Location: North Mullewa Research Station, Morawa Agricultural School.
Regeneration of annual pasture cultivars on hardsetting red clay loams at North Mullewa and Morawa in 1989 and 1990.
Trial 88TS63
Effect …
Long Term Minimum Tillage Investigations., R. J. Jarvis
Long Term Minimum Tillage Investigations., R. J. Jarvis
Experimental Summaries - Plant Research
Trial 77M13
Location: Merredin
This site was in wheat in 1975 and 1976 before the treatments commenced on continuous wheat in 1977.
77M56
Location: Merredin
Sited alongside 77M13 with the same paddock history. Commenced the wheat/pasture rotation after wheat in 1975 and 1976.
Trial 86M79
Chemical and cultivated fallow in a pasture/wheat rotation on heavy land.
Location: Merredin.
At Merredin on salmon gum/gimlet soil. Pasture treatments and soil moisture measurements were conducted in 1990. Wheat 1991.
Trial 87NA80, 81, 82, 83
Direct drilling with modified combines compared with cultivation for pasture/wheat rotations with grass control treatments in the pasture year. …
Long-Term Rotation Trials., I. Rowland, W. Hawkins
Long-Term Rotation Trials., I. Rowland, W. Hawkins
Experimental Summaries - Plant Research
Trial 66M29
Location: Merredin Research Station.
An old land site, cleared in 1909. First sown to Cyprus Barrel medic in 1955, grazed and topdressed. Cropped, 1962 and 1964. Medic resown in 1965.
Trial 67C13
Location: Chapman Research Station
An old land site, cleared in 1903. Sown to Dwalganup sub clover in 1964, topdressed each year until the start of the trial in 1967. In 1981 to 83 all plots were reseeded with Northam at 20 kg/ha. In 1988 rotations were altered to allow inclusion of grain lupins, the following changes were made:
1. The 4 plots of 2 crop :2 …
Evaluation Of Annual And Short Term Rotation Ryegrasses., Tony Albertsen
Evaluation Of Annual And Short Term Rotation Ryegrasses., Tony Albertsen
Experimental Summaries - Plant Research
The increasing range of annual and short term rotation ryegrasses have been evaluated in the high rainfall regions of the South West since 1986. To date promising later maturing cultivars such as Concord (in particular), Progrow, Aristocrat have consistently outyielded the standard early maturing cultivar Wimmera during the early winter period and in spring. These later maturing varieties have the potential to more fully utilise the whole of the growing season and to be conserved as hay during drier spring weather, whilst still retaining digestibility, protein and metabolisable energy. Viable seed production for self regeneration from later cut hay pastures …
Understanding Crop Growth On Duplex Soils., R. Belford, Miles Dracup, D. Tennant
Understanding Crop Growth On Duplex Soils., R. Belford, Miles Dracup, D. Tennant
Experimental Summaries - Plant Research
Trial 88EB18
Location: East Beverley Research Station
Impeded early root growth.
Using aerial photography and crop growth data from previous seasons we identified areas on the site where crops grow well or poorly. One of the factors implicated in the poor growth areas is impeded early root growth (see Belford et al. and Tennant et at., 1990 Experimental Summaries, this section). Here we describe the problem and outline possible causes.
Trial 88EB18
Growth and yield of wheat and lupin crops at East Beverley.
Location: East Beverley Research Station.
To measure the growth and yield of wheat and lupin crops in …
Virus Diseases Of Annual Medics., R. A. Jones, D. A. Nicholas, A. R. Baker, Simon Mckirdy, P. W. Skinner, C. Poole
Virus Diseases Of Annual Medics., R. A. Jones, D. A. Nicholas, A. R. Baker, Simon Mckirdy, P. W. Skinner, C. Poole
Experimental Summaries - Plant Research
Trial 87A19, 87MT50
Persistence of AMV in annual medic swards.
In 1990, the fourth year of this trial, although the medic plants were numerous the burr medic swards at Avondale grew poorly and weeds were widespread in the plots, especially long storkbill, flatweed and grasses. Poor growth was due to nodulation failure caused by low soil pH (5.3 in water). Hardly any medic plants were left in the Zodiac medic plot at Avondale while a few remained at Mt. Barker.
Location: Avondale and Mt. Barker.
Trial 88A21
Effect of AMV on the productivity of burr medic swards after cropping, regeneration …
Crop Tolerance To Herbicides., D. Bowran
Crop Tolerance To Herbicides., D. Bowran
Experimental Summaries - Plant Research
1. Tolerance of New Cereal Varieties to Current Herbicides EX 5506 Trial Nos: 90AL41, 90EC36, 90EB45, 90KA130, 90M85, 90NA100
2. Tolerance of Current Cereal Varieties to New Herbicides EX 5506 Trial Nos: 90M86, 90EC35, 90N74
3. Metribuzin Tolerance of Cereal Varieties EX 5507 Trial Nos: 90EC37
4. Lupin Tolerance to Herbicides EX 5508 Trial Nos: 90EC34, 90EB44
5. Pea Tolerance to Herbicides EX 5509 Trial Nos: 90KA131, 89KA64
6. Pasture Legume Tolerance to Herbicides EX 64522 Trial Nos: 90KA132,
Use Of Soil Water Measurements To Assist Crop Management In Low Rainfall Areas., S. Mckeague, M. Perry, D. Tennant
Use Of Soil Water Measurements To Assist Crop Management In Low Rainfall Areas., S. Mckeague, M. Perry, D. Tennant
Experimental Summaries - Plant Research
Trial 90M9
Trial summary.
Location: Merredin Research Station.
90M9 was established as part of the long term monitoring system to obtain base information on water use from several different soils. A simple rotation experiment was established in T3 on the Merredin Research Station.
Trial 89ME32
Rowspacing summary.
Location: Merredin Research Station.
89ME32 was monitored as part of the long term monitoring system. Previous to 1990 two years of continued measurements had been done on the same soil type. Located on the CSIRO lease block above the Merredin Research Station on Crook's property.
Trial 87M71
Heavyload rowspacing summary.
Location: Merredin Research …
Sea Turtle Conservation Program, Broward County, Fl 1990 Report, Curtis M. Burney, Catherine A. Mattison
Sea Turtle Conservation Program, Broward County, Fl 1990 Report, Curtis M. Burney, Catherine A. Mattison
Marine & Environmental Sciences Faculty Reports
Since 1978, the Broward County Environmental Protection Department (BCEPD) has provided for the conservation of endangered and threatened sea turtle species within its area of responsibility. Broward County is within the normal nesting areas of three species of sea turtles: the loggerhead sea turtle (Caretta caretta), the green sea turtle (Chelonia mydas) and the leatherback sea turtle (Dermochelys coriacea). The loggerhead is listed as a threatened species, while the green and leatherback are listed as endangered under the U.S. Endangered Species Act, 1973, and Chapter 370, F.S.
Since these statutes strictly forbid any disturbance …