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Articles 45841 - 45870 of 52501
Full-Text Articles in Physical Sciences and Mathematics
Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle
Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle
School of Natural Resources: Faculty Publications
No abstract provided.
Shelterbelts: A Buffer To Climate On The Plains, James R. Brandle
Shelterbelts: A Buffer To Climate On The Plains, James R. Brandle
School of Natural Resources: Faculty Publications
No abstract provided.
Management Of Microclimate With Windbreaks, James R. Brandle
Management Of Microclimate With Windbreaks, James R. Brandle
School of Natural Resources: Faculty Publications
No abstract provided.
Components Of Surface Energy Balance In A Temperate Grassland Ecosystem, S. B. Verma
Components Of Surface Energy Balance In A Temperate Grassland Ecosystem, S. B. Verma
School of Natural Resources: Faculty Publications
No abstract provided.
Carbon Dioxide Exchange In A Temperate Grassland Ecosystem, S. B. Verma
Carbon Dioxide Exchange In A Temperate Grassland Ecosystem, S. B. Verma
School of Natural Resources: Faculty Publications
No abstract provided.
13.2.10. Decoy Traps For Ducks, James K. Ringelman
13.2.10. Decoy Traps For Ducks, James K. Ringelman
Waterfowl Management Handbook
Waterfowl managers and researchers must often capture ducks to band, mark, or measure. During fall and winter, cannon nets, walk-in bait traps, or swim-in traps with funnel entrances are commonly used to capture ducks. However, all of these use bait, usually grain, to lure birds. During the breeding and post-breeding periods, when the diet of many dabbling duck species is dominated by aquatic invertebrates, birds often respond poorly to bait traps. Many diving ducks do not respond to bait traps at any time of the year. Decoy traps are an effective alternative to bait traps in spring and early summer …
13.2.12. Artificial Nest Structures For Canada Geese, I. J. Ball
13.2.12. Artificial Nest Structures For Canada Geese, I. J. Ball
Waterfowl Management Handbook
Under natural conditions, Canada geese are protected from predatory mammals by selecting nest sites on islands, muskrat lodges, cliffs, or snags, or nests made by ospreys or other motors. The limited availability of safe natural sites seems to hold many goose populations below limits set by other habitat factors. The use of artificial structures to provide safe nest sites for Canada geese in North America began more than 50 years ago; structures are now among the most widely used, and most successful, of goose management practices.
Structures are considered any artificial device, with the exception of earthen or rock islands, …
13.3.3. Aquatic Invertebrates Important For Waterfowl Production, Jan Eldridge
13.3.3. Aquatic Invertebrates Important For Waterfowl Production, Jan Eldridge
Waterfowl Management Handbook
Aquatic invertebrates play a critical role in the diet of female ducks during the breeding season. Most waterfowl hens shift from a winter diet of seeds and plant material to a spring diet of mainly invertebrates. The purpose of this chapter is to give managers a quick reference to the important invertebrate groups that prairie-nesting ducks consume.
Waterfowl species depend differentially on the various groups of invertebrates present in prairie wetlands, but a few generalizations are possible. Snails, crustaceans, and insects are important invertebrate groups for reproducing ducks (Table). Most species of laying hens rely on calcium from snail shells …
13.4.2. Economic And Legal Incentives For Waterfowl Management On Private Lands, Richard D. Schultz
13.4.2. Economic And Legal Incentives For Waterfowl Management On Private Lands, Richard D. Schultz
Waterfowl Management Handbook
Waterfowl management on public lands in the United States began about 1870 with the establishment of Lake Merritt, a State-owned refuge near Oakland, California. In 1924 the United States established the Upper Mississippi River Wild Life and Fish Refuge, a complex of waterfowl habitats extending from Wabasha, Minnesota, to Rock Island, Illinois. Over the next 50 years, more than 80 million acres of county, State, and Federal lands were acquired across the United States to provide waterfowl production, migration, and wintering habitats. Because of these early (and continuing) efforts, a significant portion of North America’s remaining valuable wetland complexes exists …
13.3.3. Aquatic Invertebrates Important For Waterfowl Production, Jan Eldridge
13.3.3. Aquatic Invertebrates Important For Waterfowl Production, Jan Eldridge
Waterfowl Management Handbook
Aquatic invertebrates play a critical role in the diet of female ducks during the breeding season. Most waterfowl hens shift from a winter diet of seeds and plant material to a spring diet of mainly invertebrates. The purpose of this chapter is to give managers a quick reference to the important invertebrate groups that prairie-nesting ducks consume.
Waterfowl species depend differentially on the various groups of invertebrates present in prairie wetlands, but a few generalizations are possible. Snails, crustaceans, and insects are important invertebrate groups for reproducing ducks (Table). Most species of laying hens rely on calcium from snail shells …
13.4.4. Habitat Management For Molting Waterfowl, James K. Ringelman
13.4.4. Habitat Management For Molting Waterfowl, James K. Ringelman
Waterfowl Management Handbook
The ecology, behavior, and life history strategies of waterfowl are inseparably linked to that unique avian attribute, feathers. Waterfowl rely on flight capabilities to migrate, to fully exploit the resources of wetland and upland communities, and to escape life-threatening events. The insulation provided by contour and down feathers allows waterfowl to use a wide range of habitats and protects them from temperature extremes. Plumage is important not only for species recognition during courtship, but also for cryptic coloration of females during incubation. However, feathers become worn and must be periodically replaced. The process of feather renewal, or molt, is a …
13.1.2 Life History Traits And Management Of The Gadwall, James K. Ringelman
13.1.2 Life History Traits And Management Of The Gadwall, James K. Ringelman
Waterfowl Management Handbook
The gadwall is widely distributed throughout the western two-thirds of North America. Although its primary breeding habitat is in the drought-prone and degraded waterfowl habitats of the northern Great Plains, its continental population has remained relatively stable while those of most other dabbling ducks have declined. Some unique life history traits may in part be responsible for the resilience of gadwall populations. These unique attributes, which are important for gadwall management, are the subject of this leaflet. Readers interested in general references on gadwall biology and natural history are referred to Bellrose (1980) or Palmer (1976).
The Probe, Issue 99 - January/February 1990
The Probe, Issue 99 - January/February 1990
The Probe: Newsletter of the National Animal Damage Control Association
THE PROBE National Animal Damage Control Association
JANUARY/FEBRUARY 1990
NADCA Election Results
APHIS Activity Report
Predator Meeting Conference
Treasurer’s Report
Letters to Ye Ed
Personnel
ADC Research
New Products
Animal Rights
Pflanzengesellchaften Der Mongolei, Werner Hilbig
Pflanzengesellchaften Der Mongolei, Werner Hilbig
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
First paragraphs of the introduction:
In Fortführung der Forschungsreisen der russischen Floristen und Pflanzengeouraphen im vorigen und Anfang dieses Jahrhunderts wurden erste Expeditionen zur systematischen Erforschung der Naturressourcen der Mongolei in den 20er und 30er Jahren durchgeführt. Sie wurden von der Akademie der Wissenschaften der UdSSR und der Akademie der Wissenschaften der MVR (vorher Wissenschaftliches Komitee der MVR) organisiert. Auch die von der Geographischen GeselIschaft und der Akademie der Wissenschaften der UdSSR durchgeführten Expeditionen zur Erforschung der natürlichen Bedingungen und der Landwirtschaft in der Mongolei schufen Möglichkeiten zur Entwicklung der geobotanischen Forschungsrichtung (vgl. GUBANOV u. HILBIG 1989).
Als erste eigenständi"e …
Title Page, Verso Of The Title Page, And Contents For Erforschung Biologischer Ressourcen Der Mongolischen Volksrepublik, Band 8, Michael Stubbe
Title Page, Verso Of The Title Page, And Contents For Erforschung Biologischer Ressourcen Der Mongolischen Volksrepublik, Band 8, Michael Stubbe
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Title page, verso of the title page, and contents of Erforschung biologischer Ressourcen der Mongolischen Volksrepublik, Band 8 (1990).
Introduction: Structural Properties For Determining Mechanisms Of Toxic Action, Steven P. Bradbury, Robert L. Lipnick
Introduction: Structural Properties For Determining Mechanisms Of Toxic Action, Steven P. Bradbury, Robert L. Lipnick
Steven P. Bradbury
The U.S. Environmental Protection Agency (EPA), under a variety of Federal legislation, is charged with the responsibility of assessing the hazards of chemicals to human health and the environment. In some cases EPA incorporates predictive techniques in its decisionmaking processes. In the context of some statutes, predictive toxicological methods can be cost-effective components in an overall approach for prioritizing chemicals for in-depth toxicological investigation. Predictive approaches are also used where empirical toxicological data are either unavailable or not required under a specific statute. For example, under Section 5 of the Toxic Substances Control Act (TSCA), EPA's Office of Toxic Substances …
Influence Of Cytochrome P450 Mixed-Function Oxidase Induction On The Acute Toxicity To Rainbow Trout (Salmo Gairdneri) Of Primary Aromatic Amines, Steven P. Bradbury, Joop L. M. Hermens, Steven J. Broderius
Influence Of Cytochrome P450 Mixed-Function Oxidase Induction On The Acute Toxicity To Rainbow Trout (Salmo Gairdneri) Of Primary Aromatic Amines, Steven P. Bradbury, Joop L. M. Hermens, Steven J. Broderius
Steven P. Bradbury
The influence of enzyme induction on the acute toxicity of aniline and 4-chloroaniline to rainbow trout (Salmo gairdneri) was investigated. For these two xenobiotics, bioactivation reactions are known to occur in mammals. Induction of cytochrome P450 mixed-function oxidase was obtained by intraperitoneal (ip) injection of trout with a mixture of polychlorinated biphenyls (Aroclor 1254). Five days after ip injection with three different doses of Aroclor 1254 (50. 100. and 200 mg/kg). benzo[a)pyrene hydroxylase activity in trout liver microsomes increased five- to sixfold. Cytochrome P450 concentrations in the microsomes were slightly. but significantly. enhanced in two of the three dose levels. …
An Outline Of China's Natural Resources Law, Gu Xueting, University Of Colorado Boulder. Natural Resources Law Center
An Outline Of China's Natural Resources Law, Gu Xueting, University Of Colorado Boulder. Natural Resources Law Center
Books, Reports, and Studies
8 p. ; 28 cm
Uncertainty, Politics, And Outer Continental Shelf Development, Robert B. Wiygul, University Of Colorado Boulder. Natural Resources Law Center
Uncertainty, Politics, And Outer Continental Shelf Development, Robert B. Wiygul, University Of Colorado Boulder. Natural Resources Law Center
Books, Reports, and Studies
15 p. ; 28 cm
Hawaii's Rainforest Crunch: Land, People, And Geothermal Development, Paul Faulstich
Hawaii's Rainforest Crunch: Land, People, And Geothermal Development, Paul Faulstich
Pitzer Faculty Publications and Research
One hundred and forty-one people, led by Native Hawaiians, were arrested on 25 March 1990 as part of the largest demonstration yet against geothermal development in Hawaii. The gathering was intended to focus attention on Native Hawaiian rights and the ecological consequences of drilling geothermal wells in the near-pristine Wao Kele O Puna rain forest. The energy project, undertaken by True Geothermal Company and endorsed by Hawaii's governor and other imposing figures, has already invaded the largest intact tropical lowland rain forest in the United States.
Minnesota's Boundary Waters Wilderness: Time For A New Name And A New Philosophy, T. Jeffery Evans
Minnesota's Boundary Waters Wilderness: Time For A New Name And A New Philosophy, T. Jeffery Evans
Journal of the Minnesota Academy of Science
No abstract provided.
Sustainable Agriculture-Benefits For Minnesota, Ron Kroese, Craig Cramer
Sustainable Agriculture-Benefits For Minnesota, Ron Kroese, Craig Cramer
Journal of the Minnesota Academy of Science
No abstract provided.
Preserving Minnesota's Natural Heritage, Nelson T. French
Preserving Minnesota's Natural Heritage, Nelson T. French
Journal of the Minnesota Academy of Science
Minnesota has a rich natural resource base that can be preserved only by maintaining and expanding private and public conservation programs that contribute toward the protection of forests, soils, waters, native plants, wildlife, natural communities, and endangered species. Although efforts to protect Minnesota's natural heritage have been a model for the Midwest, increasing pressure to plow up prairie, drain wetlands, consume old growth forest resources, and urbanize the landscape continue to erode an ever decreasing base of natural habitat. Significant alteration of our state's presettlement biological communities has occurred and, in spite of conservation laws and rules adopted over the …
The New Materialism: Managing Minnesota's Materials As If Matter Mattered, David Morris
The New Materialism: Managing Minnesota's Materials As If Matter Mattered, David Morris
Journal of the Minnesota Academy of Science
No abstract provided.
The St. Croix Field Research Station: A New Facility And Program Of The Science Museum Of Minnesota, Ronald W. Lawrenz
The St. Croix Field Research Station: A New Facility And Program Of The Science Museum Of Minnesota, Ronald W. Lawrenz
Journal of the Minnesota Academy of Science
No abstract provided.
Report On The Conference Of Post-Secondary Environmental Educators, Caryl Edward Buchwald, Shirley M. Dougherty
Report On The Conference Of Post-Secondary Environmental Educators, Caryl Edward Buchwald, Shirley M. Dougherty
Journal of the Minnesota Academy of Science
No abstract provided.
Extinction Is Forever, Robert Loftin Ph.D, David Wallace
Extinction Is Forever, Robert Loftin Ph.D, David Wallace
Environmental Education Resources
Edited by Joan Bray and Teri Rosen. Research by La Tanya McNeal.
This booklet is an overview of the ice ages, extirpated Animals, extinct animals, endangered animals, and humans as an endangered species. In addition, it explores the impact that humans have on the environment and the problems with climate change.
Final Report : [Land Settlement Review], Della E. Mcmillan, Thomas M. Painter, Thayer Scudder, Institute For Development Anthropology (Binghamton, N.Y.)
Final Report : [Land Settlement Review], Della E. Mcmillan, Thomas M. Painter, Thayer Scudder, Institute For Development Anthropology (Binghamton, N.Y.)
Institute for Development Anthropology Papers
No abstract provided.
La Conservation Des Forêts Au Népal: Encourager La Participation Des Femmes, Augusta Molnar
La Conservation Des Forêts Au Népal: Encourager La Participation Des Femmes, Augusta Molnar
Poverty, Gender, and Youth
Ce numéro de SEEDS porte sur les moyens mis en oeuvre pour faire participer les femmes à un programme gouvernemental visant à preserver et à restituer la forêt au Népal. Comme il arrive fréquemment lors de la mise en place de projets aussi vastes ayant une portée generale, les femmes n'étaient pas un centre d'intérêt spécifique au moment de la conception du projet. Cependant, lorsque les activités ont demarré, les responsables népalais du projet et leurs collègues de l'étranger se sont tres vite rendus compte que le succès du programme dépendait de la participation directe des femmes aux activités du …
The Planet, 1990, Winter, Sara Olason, Associated Students Environmental Center, Western Washington University
The Planet, 1990, Winter, Sara Olason, Associated Students Environmental Center, Western Washington University
The Planet
No abstract provided.