Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

Natural Resources and Conservation

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 9961 - 9990 of 10267

Full-Text Articles in Physical Sciences and Mathematics

Chesapeake Bay Bibliography - Volume Iii. Maryland Waters, Jane F. Stauble, Douglas H. Wood Jan 1975

Chesapeake Bay Bibliography - Volume Iii. Maryland Waters, Jane F. Stauble, Douglas H. Wood

Reports

The Chesapeake Bay Bibliography was initiated by the Virginia Institute of Marine Science in response to growing resource management problems of the Chesapeake Bay and its tributaries. With these problems came the realization that planning and management of such a great natural resource is an overwhelming task requiring the best available information. This bibliography, therefore, was undertaken to document existing sources of information, to help identify research and data gathering needs, and to develop a comprehensive research and information services programs for individuals interested in research on, and management of the natural resources of the Chesapeake Bay region.

This work …


Biological Inventory In Conjunction With The Las Vegas Wash Unit, Colorado River Basin Salinity Control Act Title Ii (P.L. 93-320), W. Glen Bradley, J. Scott Miller Jan 1975

Biological Inventory In Conjunction With The Las Vegas Wash Unit, Colorado River Basin Salinity Control Act Title Ii (P.L. 93-320), W. Glen Bradley, J. Scott Miller

Publications (WR)

The present report is a biological inventory in conjunction with the Las Vegas Wash Unit, Colorado River Basin Salinity Control Act, Title II. The boundaries of the project encompass sections of North Las Vegas, Las Vegas, East Las Vegas and areas along Las Vegas Wash extending to its drainage point in Las Vegas Bay in Lake Mead. Therefore, it encompasses a wide array of ecological situations and landscapes ranging from essentially natural to various stages of urban development.

This biological inventory presents basic ecological classifications, descriptions of vegetation, lists of vascular plants and vertebrates known to occur in the area. …


Breeding Waterfowl Populations In South Dakota, Wayne G. Brewster Jan 1975

Breeding Waterfowl Populations In South Dakota, Wayne G. Brewster

Electronic Theses and Dissertations

Breeding waterfowl in South Dakota were censused on 500 legal quarter sections within 125 clusters representing a proportional stratified random sample of 0.16 percent of the state area. Two breeding pair counts, one in May and second in June, were conducted each year on the sample units in 1973 and 1974. Densities of total breeding pairs averaged 5.58 and 2.30 pairs per km2 in 1973 and 1974, respectively. Estimated populations based upon these densities were 1,067,500 breeding pairs in 1973 and 439,600 breeding pairs in 1974. The 58.8 percent decrease in the population occurred concurrently with intensification of drought conditions …


Nesting Ecology Of The Ring-Necked Pheasant In Eastern South Dakota, Richard A. Olson Jan 1975

Nesting Ecology Of The Ring-Necked Pheasant In Eastern South Dakota, Richard A. Olson

Electronic Theses and Dissertations

Nesting of the ring-necked pheasant (Phasianus colchicus) was studied in 1973 and 1974 and 90 randomly chosen 4.05 – ha plots in the Lake Sinai Township of south-western Brookings County. Nest initiation and hatching peaks over the 2-year period occurred from 1-15 may and 16-30 June, respectively. Average density of nests was 0.3 per hectare in 1973 and 0.2 in 1974. Average clutch size for combined years was 8.6 for all nests and 10.8 for nests where clutches hatched. Clutch sizes declines as the nesting season progressed. Fertility of eggs in nests where clutches hatched was 96 percent. Hatching success …


Classification And Quantification Of Invertebrate Activity And The Role Of Invertebrates In Nitrogen Processing In Plants, Litter And Soil In Curlew Valley, P. R. Sferra Jan 1975

Classification And Quantification Of Invertebrate Activity And The Role Of Invertebrates In Nitrogen Processing In Plants, Litter And Soil In Curlew Valley, P. R. Sferra

Progress reports

No abstract provided.


Demographic Studies Of Sagebrush Insects As Functions Of Various Environmental Factors, T. H. Hsiao, A. K. Temte Jan 1975

Demographic Studies Of Sagebrush Insects As Functions Of Various Environmental Factors, T. H. Hsiao, A. K. Temte

Progress reports

No abstract provided.


Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, D. T. Patten Jan 1975

Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, D. T. Patten

Progress reports

No abstract provided.


Nitrogen Retention In Cool Desert Soil, J. Skujins Jan 1975

Nitrogen Retention In Cool Desert Soil, J. Skujins

Progress reports

No abstract provided.


Plant Growth And Water Transfer Interactive Process Under Desert Conditions, D. D. Evans, T. W. Sammis, J. Ben Asher Jan 1975

Plant Growth And Water Transfer Interactive Process Under Desert Conditions, D. D. Evans, T. W. Sammis, J. Ben Asher

Progress reports

No abstract provided.


Factors Affecting Seed Reserves In The Soil Of A Desert Ecosystem, R. M. Chew, J. F. Nelson Jan 1975

Factors Affecting Seed Reserves In The Soil Of A Desert Ecosystem, R. M. Chew, J. F. Nelson

Progress reports

No abstract provided.


Effects Of Grazing On Desert Vegetation, B. E. Norton Jan 1975

Effects Of Grazing On Desert Vegetation, B. E. Norton

Progress reports

No abstract provided.


Interaction Between A Fossorial Rodent (The Pocket Gopher, Thomomys Bottae) And A Desert Plant Community, R. E. Dingman, L. Byers Jan 1975

Interaction Between A Fossorial Rodent (The Pocket Gopher, Thomomys Bottae) And A Desert Plant Community, R. E. Dingman, L. Byers

Progress reports

No abstract provided.


Plant Response To Insect Herbivory, B. E. Norton, L. B. Smith Jan 1975

Plant Response To Insect Herbivory, B. E. Norton, L. B. Smith

Progress reports

No abstract provided.


Plant Growth And Water Transfer Interactive Process Under Desert Conditions, D. D. Evans, T. W. Sammis Jan 1975

Plant Growth And Water Transfer Interactive Process Under Desert Conditions, D. D. Evans, T. W. Sammis

Progress reports

No abstract provided.


Effect Of Density On The Population Dynamics Of Perognathus Formosus And Its Relationships Within A Desert Ecosystem, R. M. Chew Jan 1975

Effect Of Density On The Population Dynamics Of Perognathus Formosus And Its Relationships Within A Desert Ecosystem, R. M. Chew

Progress reports

No abstract provided.


Growth Of Perennials In Response To Varying Moisture And Defoliation Regimes, J.A. Macmahon, B.E. Norton, B.M. Capen Jan 1975

Growth Of Perennials In Response To Varying Moisture And Defoliation Regimes, J.A. Macmahon, B.E. Norton, B.M. Capen

Progress reports

No abstract provided.


Abundance And Distribution Of Soil Mictroarthropods In Rock Valley, Nevada, E. B. Edney, J. F. Mcbrayer, P. J. Franco, A. W. Phillips Jan 1975

Abundance And Distribution Of Soil Mictroarthropods In Rock Valley, Nevada, E. B. Edney, J. F. Mcbrayer, P. J. Franco, A. W. Phillips

Progress reports

No abstract provided.


Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman Jan 1975

Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman

Progress reports

No abstract provided.


Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor Jan 1975

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

Progress reports

No abstract provided.


Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J.J. Jurianak, D.W. James, A. Van Luik Jan 1975

Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J.J. Jurianak, D.W. James, A. Van Luik

Progress reports

No abstract provided.


Studies On Wood Borers, Girdlers And Seed Predators Of Mesquite, W. G. Whiteford, R. K. Johnson, D. J. Depree Jan 1975

Studies On Wood Borers, Girdlers And Seed Predators Of Mesquite, W. G. Whiteford, R. K. Johnson, D. J. Depree

Progress reports

No abstract provided.


Nitrogen Dynamics In Stands Dominated By Some Major Cool Desert Shrubs.V. Studies On Denitrification And Nitrogen Fixation: Comparison Of Biological Processes In Western Deserts, J.J. Skujins Jan 1975

Nitrogen Dynamics In Stands Dominated By Some Major Cool Desert Shrubs.V. Studies On Denitrification And Nitrogen Fixation: Comparison Of Biological Processes In Western Deserts, J.J. Skujins

Progress reports

No abstract provided.


Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J. J. Jurinak, D. W. James, R. L. Evans Jan 1975

Nitrogen And Phosphorus Constraints On Primary Production In The Great Basin Desert, J. J. Jurinak, D. W. James, R. L. Evans

Progress reports

No abstract provided.


Water Loss In Chihuahuan Desert Ants, W. G. Whiteford, C. A. Kay, A. M. Schumacher Jan 1975

Water Loss In Chihuahuan Desert Ants, W. G. Whiteford, C. A. Kay, A. M. Schumacher

Progress reports

No abstract provided.


Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman Jan 1975

Effects Of Rodents On Germination Of Desert Annuals, O. J. Reichman

Progress reports

No abstract provided.


Rodent Seed Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown Jan 1975

Rodent Seed Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown

Progress reports

No abstract provided.


Rodent Seed Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown Jan 1975

Rodent Seed Foraging Strategies And Competition With Ants In The Sonoran Desert, J. H. Brown

Progress reports

No abstract provided.


Factors Affecting Seed Reserves In The Soil Of A Desert Ecosystem, R. M. Chew, J. F. Nelson Jan 1975

Factors Affecting Seed Reserves In The Soil Of A Desert Ecosystem, R. M. Chew, J. F. Nelson

Progress reports

No abstract provided.


Functional Relationships Among The Organisms Comprising Detritus-Based Foodchains At The Rock Valley Site, J. F. Mcbrayer, G. E. Mamolito, P. J. Franco Jan 1975

Functional Relationships Among The Organisms Comprising Detritus-Based Foodchains At The Rock Valley Site, J. F. Mcbrayer, G. E. Mamolito, P. J. Franco

Progress reports

No abstract provided.


Influence Of Digging Rodents On Primary Production In Rock Valley, L.F. Soholt, W.K. Irwin Jan 1975

Influence Of Digging Rodents On Primary Production In Rock Valley, L.F. Soholt, W.K. Irwin

Progress reports

No abstract provided.