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Environmental Sciences

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Articles 50881 - 50910 of 52415

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Plant Productivity And Nutrient Interrelationships Of Perennials In The Mohave Desert, Samuel Bamberg, Arthur Wallace, Gale Kleinkopf, Arthur Vollmer Jan 1973

Plant Productivity And Nutrient Interrelationships Of Perennials In The Mohave Desert, Samuel Bamberg, Arthur Wallace, Gale Kleinkopf, Arthur Vollmer

Memorandum

No abstract provided.


Shoot Growth And Litter Fall Processes As They Bear On Primary Production Of Some Cool Desert Shrubs, N. E. West, Marcee Fareed Jan 1973

Shoot Growth And Litter Fall Processes As They Bear On Primary Production Of Some Cool Desert Shrubs, N. E. West, Marcee Fareed

Memorandum

No abstract provided.


Biomass And Nutrients In Desert Shrub Ecosystems, James O. Klemmedson, Edwin L. Smith Jan 1973

Biomass And Nutrients In Desert Shrub Ecosystems, James O. Klemmedson, Edwin L. Smith

Memorandum

No abstract provided.


Biology Of Nematodes In Desert Ecosystems, R. Mankau, S. A. Sher, D. W. Freckman Jan 1973

Biology Of Nematodes In Desert Ecosystems, R. Mankau, S. A. Sher, D. W. Freckman

Memorandum

No abstract provided.


Application Of Remote Sensing Techniques For Analysis Of Desert Biome Validation Studies, P. T. Tueller, Garwin Lorain Jan 1973

Application Of Remote Sensing Techniques For Analysis Of Desert Biome Validation Studies, P. T. Tueller, Garwin Lorain

Memorandum

No abstract provided.


Seed Reserves Of Desert Soils, Stuart Childs, David W. Goodall Jan 1973

Seed Reserves Of Desert Soils, Stuart Childs, David W. Goodall

Memorandum

No abstract provided.


Nitrogen Dynamics In Stands Dominated By Some Major Cool Desert Shrubs, J. J. Skujins, N. E. West Jan 1973

Nitrogen Dynamics In Stands Dominated By Some Major Cool Desert Shrubs, J. J. Skujins, N. E. West

Memorandum

No abstract provided.


Foraging Activity Of The Leaf-Cutter Ant, Acromyrmex Versicolor, In Relation To Season, Weather And Colony Condition, F. G. Werner Jan 1973

Foraging Activity Of The Leaf-Cutter Ant, Acromyrmex Versicolor, In Relation To Season, Weather And Colony Condition, F. G. Werner

Memorandum

No abstract provided.


Population Structure, Foraging Behavior And Daily Movements Of Certain Sonoran Desert Birds, S. M. Russell, P. J. Gould, E. L. Smith Jan 1973

Population Structure, Foraging Behavior And Daily Movements Of Certain Sonoran Desert Birds, S. M. Russell, P. J. Gould, E. L. Smith

Memorandum

No abstract provided.


Colony Characters Of Termites As Related To Population Density And Habitat, W. L. Nutting, M. I. Haverty, J. P. Lafage Jan 1973

Colony Characters Of Termites As Related To Population Density And Habitat, W. L. Nutting, M. I. Haverty, J. P. Lafage

Memorandum

No abstract provided.


Role Of Orthoporus Ornatus Millipedes In A Desert Ecosystem, C. S. Crawford, R. C. Wooten Jr. Jan 1973

Role Of Orthoporus Ornatus Millipedes In A Desert Ecosystem, C. S. Crawford, R. C. Wooten Jr.

Memorandum

No abstract provided.


Demography And Bioenergetics Of Herbivorous Ants In A Desert Ecosystem As Functions Of Vegetation Soil Type And Weather Variables, W. G. Whitford Jan 1973

Demography And Bioenergetics Of Herbivorous Ants In A Desert Ecosystem As Functions Of Vegetation Soil Type And Weather Variables, W. G. Whitford

Memorandum

No abstract provided.


Demographic And Bioenergetic Studies Of Cutworms In Curlew Valley, W. J. Hanson, G. F. Knowlton Jan 1973

Demographic And Bioenergetic Studies Of Cutworms In Curlew Valley, W. J. Hanson, G. F. Knowlton

Memorandum

No abstract provided.


Gaseous Losses Of Nitrogen From The Soil Of Semi-Arid Regions, T. C. Tucker, R. L. Westernman Jan 1973

Gaseous Losses Of Nitrogen From The Soil Of Semi-Arid Regions, T. C. Tucker, R. L. Westernman

Memorandum

No abstract provided.


Respiratory Metabolism Of Utah Chub (Gila Atraria), R. H. Kramer, P. K. Rajagopal Jan 1973

Respiratory Metabolism Of Utah Chub (Gila Atraria), R. H. Kramer, P. K. Rajagopal

Memorandum

No abstract provided.


Water Uptake By Plants Under Desert Conditions, H. K. Qashu, D. D. Evans, M. L. Wheeler, Theodore Sammis Jan 1973

Water Uptake By Plants Under Desert Conditions, H. K. Qashu, D. D. Evans, M. L. Wheeler, Theodore Sammis

Memorandum

No abstract provided.


Curlew Valley Validation Site Report, David F. Balph Jan 1973

Curlew Valley Validation Site Report, David F. Balph

Memorandum

No abstract provided.


Distillation-Condensation Of Water And Nutrient Movement In A Desert Ecosystem, N. Stark Jan 1973

Distillation-Condensation Of Water And Nutrient Movement In A Desert Ecosystem, N. Stark

Memorandum

No abstract provided.


Terrestrial Models: Introduction And Main Programs, D. W. Goodall, C. Gist Jan 1973

Terrestrial Models: Introduction And Main Programs, D. W. Goodall, C. Gist

Memorandum

No abstract provided.


Terrestrial Models: Plant Processes (Version I, Ii, Iii), W. Valentine Jan 1973

Terrestrial Models: Plant Processes (Version I, Ii, Iii), W. Valentine

Memorandum

No abstract provided.


Terrestrial Models: Animal Processes (Versions I, Ii), S. Payne Jan 1973

Terrestrial Models: Animal Processes (Versions I, Ii), S. Payne

Memorandum

No abstract provided.


Sensitivity Analysis, I. Noy-Meir, D. Goodall Jan 1973

Sensitivity Analysis, I. Noy-Meir, D. Goodall

Memorandum

No abstract provided.


Aquatic Models, Wayne Minshall Jan 1973

Aquatic Models, Wayne Minshall

Memorandum

No abstract provided.


Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, Peter L. Comanor Jan 1973

Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, Peter L. Comanor

Memorandum

No abstract provided.


Measurements Of Carbon And Nitrogen Changes In Soil, Eugene E. Staffeldt, Kristina Bemond Vogt Jan 1973

Measurements Of Carbon And Nitrogen Changes In Soil, Eugene E. Staffeldt, Kristina Bemond Vogt

Memorandum

No abstract provided.


Prediction Of Plant-, Soil- And Air-Temperature On A Microscale In The Desert, Inge Dirmhirn, Frank Eaton Jan 1973

Prediction Of Plant-, Soil- And Air-Temperature On A Microscale In The Desert, Inge Dirmhirn, Frank Eaton

Memorandum

No abstract provided.


Diest, Food Preference And Reproductive Cycles Of Some Desert Rodents, Russell P. Balda, Clark E. Franz, O.J. Reichman, Kent M. Van De Graaff Jan 1973

Diest, Food Preference And Reproductive Cycles Of Some Desert Rodents, Russell P. Balda, Clark E. Franz, O.J. Reichman, Kent M. Van De Graaff

Memorandum

No abstract provided.


Consumption, Utilization And Modification Of Nutritional Resources By The Jackrabbit (Lepus Californicus) In The Mohave Desert, V.H. Shoemaker, K.A. Nagy, W.R. Costa Jan 1973

Consumption, Utilization And Modification Of Nutritional Resources By The Jackrabbit (Lepus Californicus) In The Mohave Desert, V.H. Shoemaker, K.A. Nagy, W.R. Costa

Memorandum

No abstract provided.


Chronic Toxicity Of A Copper, Cadmium And Zinc Mixture To The Fathead Minnow (Pimephales Promelas Rafinesque), John G. Eaton Jan 1973

Chronic Toxicity Of A Copper, Cadmium And Zinc Mixture To The Fathead Minnow (Pimephales Promelas Rafinesque), John G. Eaton

United States Environmental Protection Agency: Publications

Fathead minnows were exposed to a series or concentrations of a copper, cadmium and zinc mixture during a 12.5 month chronic test in water of 200 mg 1-1 total hardness. The metal concentrations in the mixture were selected on the basis of results obtained during previous chronic exposures to each of the metals individually in the same water. Strict summation of the chronic toxicities of the metals was not indicated when they were tested in combination. Toxic effects of the mixture attributable to copper appeared to be increased, but that attributable to cadmium was reduced. The effects thought to …


Captan Toxicity To Fathead Minnows (Pimephales Promelas), Bluegills (Lepomis Macrochirus), And Brook Trout (Salvelinus Fontinalis), Roger O. Hermanutz, Leonard H. Mueller, Kenneth D. Kempfert Jan 1973

Captan Toxicity To Fathead Minnows (Pimephales Promelas), Bluegills (Lepomis Macrochirus), And Brook Trout (Salvelinus Fontinalis), Roger O. Hermanutz, Leonard H. Mueller, Kenneth D. Kempfert

United States Environmental Protection Agency: Publications

The toxic effects of capt an on survival, growth, and reproduction of fathead minnows (Pimephales promelas) and on survival of bluegiIIs (Lepomis macrochirus) and brook trout (Salvelinus fontinalis) were determined in a flow-through system. In a 45-week exposure of fathead minnows, survival and growth were adversely affected at 39.5 μLg/Iiter. Adverse effects on spawning were suspected but not statisticaIly demonstrated at 39.5 and 16.5 μLg/Iiter. The maximum acceptable toxicant concentration (MATC), based on survival and growth, lies between 39.5 and 16.5 μLg/liter. The lethal threshold concentration (LTC) derived from acute exposures was 64 μLg/liter, …