Life Sciences Commons^™

Lake Mead Prefertilization Study: Preliminary Nutrient Enhancement Studies In Lake Mead, Richard P. Axler, Larry J. Paulson, Patrick J. Sollberger, Donald H. Baepler, U.S. Bureau Of Reclamation

Publications (WR)

Studies conducted by the University of Nevada-Las Vegas (UNLV), the Nevada Department of Wildlife (NDOW), the Arizona Game and Fish Department (AGFD), The Nevada Division of Environmental Protection (NDEP), and the United States Bureau of Reclamation (USBR) have identified decreased algal production as a major factor involved in the decline of the Lake Mead sport fishery. Phosphorus-laden silt particles in the Colorado River have been sedimenting out in Lake Powell since the completion of Glen Canyon Dam 286 miles upstream in 1963. This sharp decrease in phosphorus loading to Lake Mead (>5000 tons per year) has resulted in decreased …

Thermal Tolerances And Preferences Of Fishes Of The Virgin River System (Utah, Arizona, Nevada), James E. Deacon, Paul B. Schumann, Edward L. Stuenkel

Publications (WR)

Critical thermal maxima (CTM) and thermal preferenda of the common fishes of the Virgin River were examined. Differences in final temperature preferenda and CTM for species with low thermal lability (speckled dace, spinedace, roundtail chub) correspond well with differences in their distribution and abundance in the river. These species shifted their acute thermal preferences relatively little as acclimation temperature increased. For thermally labile species (woundfin, red shiner, desert sucker, and fiannehnouth sucker), the final preferendum is a less precise indicator of probable distribution. The woundfin, an endangered fish, has a high CTM (39.5 C at 25 C acclimation) and a …

Benthic Invertebrates And Crayfish Of Lake Mead, Susan K. Peck, William L. Pratt, James E. Pollard, Larry J. Paulson, Donald H. Baepler

Publications (WR)

The objectives of this study were to:

1. Establish baseline densities of benthic invertebrates and relative abundance of crayfish in Lake Mead.

2. Evaluate the distributions of benthic organisms and crayfish in relation to existing habitat conditions and 1imnological characteristics of Lake Mead.

3. Measure seasonal changes in abundances of benthic organisms and crayfish in Lake Mead.

4. Compare observations of Procambarus clarkii life history in Lake Mead to reports from other aquatic systems.

5. Evaluate the importance of benthic organisms and crayfish as food sources for game fish in Lake Mead.

Estimation Of Food Limitation In Daphnia Pulex From Boulder Basin, Lake Mead, Thomas Mark Bartanen

Publications (WR)

In February, 1982 I began a year-long study to determine if growth and reproduction in Daphnia Pulex were limited by the amount of food available in Boulder Basin, Lake Mead. To determine this, I made monthly collections of Daphnia Pulex and natural lake seston from an already established station in Boulder Basin. I cultured the Daphnia Pulex under simulated field conditions in a flow-through feeding apparatus using four different food regimes; 1-natural lake seston filtered through 80 um mesh to remove other zooplankton, 2-lake seston (as above) with an enrichment of 10³ cells-ml^-1 of Chlamydomonas reinhardti, 3-lake …

Lake Mead Cover Enhancement Project, Jennifer Stevens Haley, Suzanne Leavitt, Larry Paulson, Donald H. Baepler

Publications (WR)

Ninety-three wildlife agencies were surveyed for information on their attempts to improve fish habitat. In addition, an annotated bibliography including over 100 summaries was completed on:

1. largemouth bass cover requirements and preferences,

2. use and effectiveness of artificial cover,

3. aquatic plant introduction and species requirements for germination and establishment,

4. terrestrial plant introduction and species requirements for germination and establishment, and

5. nutrient exchange between sediment, aquatic plants, and water.

A reconnaissance of existing terrestrial and aquatic vegetation was completed in June 1986 including the production of a video tape of the Nevada shoreline of Lake Mead.

Cover …

An Annual Study Of Phytoplankton Composition And Associated Environmental Conditions Of Lake Trashmore, Virginia Beach, Virginia, Seba B. Sheavly

Biological Sciences Theses & Dissertations

A 12 month study of Lake Trashmore was conducted on phytoplankton composition, inorganic nutrients and their seasonal associations. The dominant phytoplankton groups observed were diatoms, chlorophyceans and cyanobacteria. Phytoplankton assemblage patterns were coupled with pH, temperature, dissolved oxygen, nitrites and silicates. Diatoms dominated during periods of high nutrient concentrations, cooler temperatures and an unstable water column. Cyanobacteria forms dominated during periods of warmer temperatures, higher pH and decreased nitrogen and dissolved oxygen concentrations. A seasonal community shift occurred from cyanobacterial dominance to chlorophycean dominance when pH levels decreased. The lake is eutrophic based on indices of chlorophyll a concentrations, transparency …

Las Vegas Wash And Lake Mead Proposed Water Quality Standards: Revisions And Rationale, State Of Nevada: Division Of Environmental Protection

Publications (WR)

Rationale of review and for proposed changes to the Nevada Pollution Control Regulations (NAC 445.1354, 445.1355, 445.1356, 455.1367, 445.1352, 445.1353, 445.1350, 445.1351) before the State Environmental Commission on June 23 and 24, 1987.

Raw Nutrient Data, Leanna Gail

Publications (WR)

Data collected at various stations around Lake Mead. Includes information about substances present in various water samples.

Comparison Of Littoral And Limnetic Zooplankton Communities Of Lake Mead, Patrick Joseph Sollberger

Publications (WR)

Microfaunal communities were studied in littoral (inshore) and limnetic (offshore) areas of the lower basin in Lake Mead to compare species composition and abundance between the two zones. Planktonic forms (zooplankton) dominated inshore and offshore habitats and the occurrence of littoral species was low. Therefore, high similarity in zooplankton species composition was found among all sampling stations. This was perhaps due to two main factors: (i) the physical and chemical environment among the stations were very similar and (ii) the lack of aquatic vegetation in the littoral zone reduced the occurrence of littoral species.

Although species composition did not vary …

Depth-Controlled Modified Combine For Direct Drilling And Lupin Row Spacing., R. Belford, G Reithmuller

Experimental Summaries - Plant Research

Trial 87WH52, (86M56)

Depth-controlled modified combine for direct drilling.

To compare soil penetration resistance, crop growth, water use, nutrient uptake and root development of wheat 1) sown after scarifying; 2) direct drilled with a combine; 3) direct drilled with the depth-controlled modified combine with loosening ties at 5, 9 or 13 cm; or 4) sown after deep ripping with an Agrowplow to 13 or 30 cm.

Trial 87M82

Location: Merredin Research Station paddock T6 south.

Lupin row spacing

Rapeseed, Tillage., J. D. Warren, Brenda Shackley

Experimental Summaries - Plant Research

1. Rapeseed. Assessment of Early Maturing Brassica napus Lines 87KA74, 87LG42, Assessment of Early Flowering Brassica juncea Lines 87KA44, 87E41, 87LG38, 87KA44, 87LG38, Yield Performance of Traizine Resistant Rapeseed 87AL25, 87E40, 87KA42, 87KA42, 87LG37, 87MA32, Assessment of Short Statured B. napus lines 87AL26, 87KA43, 87MA33, Rapeseed Extension: Demonstration Trials 87ERS39, 87JE29, 87KA41, 87NA78. 2. Tillage. The effect of Gypsum, tillage and nitrogen on cereal yields in a continuous crop system 84KA28 The effect of Gypsum, tillage and nitrogen on cereal yields farm system with a medic component 87KA47 Pasture regeneration counts for tillage trials 77MT51, 77M56, 77WH88, 82M35, 85M67A, 86M56.

Evaluation Of New Pasture Legume Species In Terms Of Summer Feeding Value And Effects On Wool Production., S E. Flecker, C W. Thorn, J. B. Rowe, Tess Casson

Experimental Summaries - Plant Research

86KA71, Pasture legumes improve the feeding value of summer pastures in a mediterranean-type environment by maintaining the protein intake of grazing animals over the dry summer period, much of which comes from the ingestion of legume burr (A.D. Wilson and N.L. Hindley, 1968). Some of the most important species of pasture legumes to have been released commercially are Trifolium subterraneum (sub.clover), Medicago truncatula (barrel medic) and Medicago polymorpha (burr medic) (D.B. Purser, G.B. Taylor and W.J. Collins, 1987). What little information is available on the feeding value of these species suggests that barrel medic pod (H. Brownlee, 1973) and dry …

The Role Of Barley In Future Rotational Systems In Drier Wheatbelt Areas Of Western Australia., P. Simpson

Experimental Summaries - Plant Research

Comparison of barley and wheat yields over four soil types and yield component analysis at Nangeenan NW of Merredin, 86ME88, 86ME89, 86ME90 and 86ME91. Comparison of barley and wheat yields over four soil types at Bodallin, east of Merredin, 86ME92, 86ME93, 86ME94 and 86ME95. Comparison of barley and wheat yields over two ‘levels’ of soil salinity - EC, 87ME63 and 87ME64. Comparison of barley and wheat yields over 2 soils of differing textural type – ‘heavy’ and ‘light’, 87ME65 and 87ME66. Effect of time of sowing on barley and wheat yields, 87ME67.

Trial 65sg5, I Rowland., W Hawkins

Experimental Summaries - Plant Research

Trial 65SG5. Location - Paddock H5 on Salmon Gum Research Station

Cleared in 1962, then cropped until the start of the trial in 1968. Two of the four blocks were sown to Cyprus Barrel medic which is topdressed with superphosphate. The other two blocks regenerate volunteer pasture which is not topdressed. In 1984 all pasture plots were sown to SERENA medic. This grew exceptionally well in 1984 and set a lot of seed. In 1987 field peas were introduced into 4 reps of an existing medic: crop rotation.

Trial 80na6, I Rowland., W Hawkins

Experimental Summaries - Plant Research

Trial 80NA6. Location - B. Harrington, 6 km west of Darkin.

Cleared 1962, cropped 1977 (oats), 1978 (oats and Lupins), pasture in 1979. Continuously cropped to cereals up to 1986, then changed to wheat after wheat, lupins or clover.

Agronomy Of Wheat Cultivars., W. K. Anderson, M. Seymour

Experimental Summaries - Plant Research

Location: Northam, Wongan Hills, East Beverley, Corrigin and Merredin.

Time of sowing x wheat cultivars, 87N07, 87N011, 87WH7, 87NA4, 87M11. Time of sowing x wheat cultivars.

Nitrogen rates x wheat cultivars, 87N05, 87N09, 87WH5, 87NA2, 87M9.

Seed rates x wheat cultivars, 87N06, 87N010, 87WH6, 8JNA3, 87M10.

Wheat cultivar factorial, 87N04, 87N08, 87WH4, 87NA1.

Tillage Investigations., R. J. Jarvis, L. G. Butcher, L. D.J. Smith

Experimental Summaries - Plant Research

77A16, red/brown sandy loam - York gum. 77WH17, yellow clayey-sand (Wongan loamy sand). 77M13, red sandy clay loam (Salmon Gum, Gimlet). 77Mt15, gravelly loamy sand/sandy loam - forest soil. 77A43 brown loamy sand/sandy loam - jam country. 77WH88, grey loamy sand over gravel at 50 cm - Elphin soil series – Mallee. 77M56, red sandy clay loam - salmon gum, Gimlet. 82M35, Loamy sand/sandy loam – Mallee. 77E52, fine white sand over gravel at 40 cm. 85SG28, grey-brown calcareous Earth - Kumarl – SGRS. 84M064, heavy land management systems - medium rainfall area. 84M063, heavy land management systems - ne …

Harvest Index Of Lupins, Low Tillering Cereals And Maturity By Sowing Date In Cereals., R. J. Delane, J. C. Mathews, J. A. Bright

Experimental Summaries - Plant Research

Trial 87GE21

Effect of plant density on branching, pod setting and yield development of lupins.

Location: Geraldton

To determine the influence of plant density and between-plant variability in vegetative growth on the branching, pod setting and yield development of lupins

Trial 87GE9

Chemicals to control vegetative growth and improve pod set in lupins.

Location: West Binnu

To examine the effect of a number of growth regulating chemicals on the branching, pod setting and yield of lupins under conditions favoring high biomass production.

Trial 87GE19

Chemicals to control vegetative growth and improve pod set in lupins.

Location: Nabawa

To examine the …

Crop Agronomy., S. Porritt

Experimental Summaries - Plant Research

Seeding machinery for stubble retention in lupin cereal rotations, 85LG21, and 85LG22. Dynamic Lifter (cereal mix) fertiliser evaluation, 86LG2. Cultural systems for lupin: wheat rotations on water repellent soils, 87ES2. Stubble retention and Rovral for brownspot control in lupins, 87M66. Straw length Effects on wheat growth on red-brown earths, 87M70. Row spacing and stubble retention effects on wheat growth on red-brown earths, 87M71. Nitrogen fertiliser for wheat production after volunteer pasture or sub clover-based pasture, 87ME73 and 87ME74. Effect of seeding rate and sowing depth on lupin establishment, 87ME75. Time of seeding various wheat varieties, 87WE76.

Experiments On Grain Yield In A Range Of Old And Modern Wheat Varieties., K. H.M. Siddique, D. Tennant, R. K. Belford, M. W. Perry, L. Mclaughlin, A. R. Thompson

Experimental Summaries - Plant Research

Growth, yield, water use and water use efficiency of old and modern wheat varieties in a mediterranean type environment, 87M17 and 87WH14. Ear and stem dry matter at anthesis and grain yield in a range of wheat varieties, 87M18.

Field Pea Agronomy., I. A. Pritchard, G. Cooper, D. Dodge

Experimental Summaries - Plant Research

Field peas sowing rates, 87A31. Field peas time of sowing, 87A32. Field peas factional agronomy, 87A33. Field pea sowing rates, 87N092. Field peas time of sowing, 87N093. field peas - factorial agronomy, 87N094.

Wheat Experimental Results, S. P. Loss

Experimental Summaries - Plant Research

The development of wheat relative to frost susceptibility, 87NA10. Optimum flowering times of wheat, 87NA11 and 87WH8. Grain growth and development of a historical set of wheats.

High Input Barley Production Systems In The High Rainfall Zone., G. J. Parlevliet

Experimental Summaries - Plant Research

Barley systems in the high rainfall zone effect of nitrogen fungicides and seeding rate on barley yield, 87BR2.

Long Season Wheat, W. R. Smith, K. Anderson

Experimental Summaries - Plant Research

Agronomy of long season wheats, 87AL9, 87AL10, 87ES3, 87ES4, 87JE2, 87JE3, 87MT8, 87MT9 and 87NA9. Septoria control in long season wheat, 87E4 and 87MT10. Nitrogen response by long season wheat, 87ES5 and 87JE4. Phenology of long season wheats, 87E5 and 87MT11.

Disease And Insect Resistance; Murex Medic Evaluation; Legume Species Phasic Development, D J. Gillespie

Experimental Summaries - Plant Research

A summary of the performance of the control varieties (four replications) is shown in Table 3. A summary of the root rot ratings for some varieties showing a range of root rot susceptibility to all four pathogens is given in Table 4. Plant weights were recorded for all varieties tested against the three pathogens in the Western Australian experiments. Results for 12 of the 60 varieties are shown in Table 5. Murex medic evaluation. 86MT56 (Mount Barker), Gravelly loam pH 5.2 (water). 86NA46 (Darken) Loamy sand pH 5.4 86M037 (Regans Ford) Fine red sand pH 5.8 All sites were established …

Grain Legumes Evaluation., G. H. Walton, T. R. Trent

Experimental Summaries - Plant Research

Lupin agronomy, 87AL14. Nitrogen fertilizer for legume crops, 87BA2. Pea variety evaluation, 87C59, 87M08, 87ME1, 87N012, 87SG8, 87KA7, 87N2. Interstate pea variety trials, 87N096, 87N099, 87KA6. Disease Resistance Pea Variety Testing, 87JE1. Grain legume species comparisons, 87A2, 87C2, 87KA37, 87M09, 87MA1, 87NA15. Legume species variety trials, 87LG2. Faba bean evaluation, 87MC34 and 87KA8. Faba bean 'synthetic' variety yield trial, 87MC36. Faba bean screening nursery, 87MC35. Preliminary agronomy of faba bean, chickpea and lentil, 87A21. Seeding date, 87A22. Legume species herbicide tolerance, 87KA82.

Serradella Line Evaluation — Stage 2, L. Cransberg

Experimental Summaries - Plant Research

Trial 85AL55.

Location: South Sterlings

To evaluate 23 promising serradella lines in terms of herbage and seed production and regenerative ability.

Sheep Production Systems On Mediterranean Annual Pastures., Department Of Agriculture, Western Australia.

Experimental Summaries - Plant Research

Trial 84V2.

Location: Vasse Research Station

Aims: To define seasonal pasture production curves for three rainfall zones in Western Australia. To determine animal productivity under different production systems in response to seasonal pasture production. To provide Western Australian data useful for validation of sheep simulation models. To provide data for different production systems to increase the scope of the simulation models.

The Effect Of Soil Acidity On Barley, P J. Dolling, T. D. Haines

Experimental Summaries - Plant Research

Three liming experiments were established to confirm previous estimates of the critical soil acidity level for barley. Two experiments studying the effect of depth of incorporation on the effectiveness of lime, established in 1986, were continued in 1987.
The results from the three liming experiments established this year supported the conclusion that barley is affected by soil acidity at pH's around 4.2 and 4.3 (CaC1₂) and that depth of this acid layer is important.
Significant lime responses were obtained at the Katanning depth of lime incorporation site but conclusions can not be made because of possible mixing of …

Individual Trial Data., P J. Dolling

Experimental Summaries - Plant Research

Responses to species of lime.

87NA91

87A137

87KA77