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Articles 18391 - 18420 of 19672
Full-Text Articles in Entire DC Network
Bureaucracy And Wildlife: A Historical Overview, Edward E. Langenau
Bureaucracy And Wildlife: A Historical Overview, Edward E. Langenau
Laws and Legislation Collection
This paper provides a framework for understanding the Government's position on many wildlife topics, including humane ethics. The historical role of Government in wildlife conservation is traced in relation to pertinent theories of bureaucracy. It is shown that Government involvement in wildlife conservation increased through successive stages of change because of interest group activity.
These periods of increased Government involvement in wildlife matters are shown to have followed periods of resource exploitation. Recurrent cycles of exploitation, accompanied by economic prosperity, have then been followed by attitudes favorable to conservation and political activism. This, in turn, has produced periods of backlash …
Urban Wildlife Habitat -- Present And Future, David Tylka
Urban Wildlife Habitat -- Present And Future, David Tylka
Ecology Collection
Many kinds of wild animals can become adapted to living in cities, provided that the right kinds of habitats are available and that their presence is accepted by city-dwellers. Suitable habitats can be furnished by traditional parks, tracts of "wild acres" set aside by cities, linear parks, cemeteries and golf courses, and transportation corridors. Buildings, rooftops, and institutional grounds can also provide habitat for animals like birds and butterfiles. Suburban areas can encourage the growth of local wildlife by neglecting to mow common grounds, or allowing sections of individual lawns to grow up with wild vegetation.
Ethical Issues And Future Directions In Wildlife Management, John W. Grandy
Ethical Issues And Future Directions In Wildlife Management, John W. Grandy
Nature Collection
Recent progress in protection of wildlife and wildlife refuges is currently being undermined by the efforts of James Watt, U.S. Secretary of the Interior, who believes that commercial interests should take precedence over the preservation of pristine wilderness areas and wildlife sanctuaries. The consequent loss, as populations approach extinction because of programs like decimation of habitats and predator control, is more than simply aesthetic: genetic material unique to each species will be lost forever. Particular issues of immediate concern are the fate of bobcats and whales, inhumane trapping, and the Endangered Species Act. As a longer-term concern, the goal of …
Introduced Species And The Issue Of Animal Welfare, Michael Hutchins, Victoria Stevens, Natasha Atkins
Introduced Species And The Issue Of Animal Welfare, Michael Hutchins, Victoria Stevens, Natasha Atkins
Ecology Collection
Recently, considerable debate has been heard about the control or elimination of introduced or "exotic" animals on publicly held U.S. lands. Species introductions, whether intentional or unintentional, seem to be an inevitable result of human activities, but they may result in both economic and ecological problems: It has been estimated that over 90 percent of all such introductions have been harmful in some respect. Control of exotics can be accomplished through containment, shooting, poisoning, reintroduction of native predators, introduction of disease organisms, live capture and removal, and reproductive inhibition.
Those who must make decisions about the fate of introduced species …
Behavioral Ecology Of Coyotes: Social Organization, Rearing Patterns, Space Use, And Resource Defense, Marc Bekoff, Michael C. Wells
Behavioral Ecology Of Coyotes: Social Organization, Rearing Patterns, Space Use, And Resource Defense, Marc Bekoff, Michael C. Wells
Ethology Collection
Two groups of coyotes in which genealogical relationships were known were studied in the Grand Teton National Park, outside of Jackson, Wyoming, U.S.A., from 1977-1982. One group, a pack consisting of parents and some non-dispersing and non-breeding offspring, defended a territory and the food (mainly elk carrion) contained within it, especially during winter, and also had helpers at den sites (5 of 6 were males). The other group, a mated resident pair, all of whose young dispersed during the first year of life, did not defend a territory and never had helpers at dens. Delayed dispersal and retention of some …
The Influence Of Habitat Variation On The Morphology And Physiology Of Plethodon Wehrlei (Fowler And Dunn) In West Virginia, Sharon Kay Gross
The Influence Of Habitat Variation On The Morphology And Physiology Of Plethodon Wehrlei (Fowler And Dunn) In West Virginia, Sharon Kay Gross
Theses, Dissertations and Capstones
High elevation, low elevation and cave populations of Plethodon wehrlei (Fowler and Dunn) in West Virginia were compared to determine the influence of habitat variation on morphology and physiology. Discriminant analysis of 14 external morphological characters and 11 skeletal characters revealed a similar morphology for the three populations. Comparisons of critical thermal maxima showed a positive correlation to habitat temperature. Dehydration studies revealed that the high elevation population was more resistant and tolerant to water loss than the cave and low elevation populations.
A Distributional And Taxonomic Study Of The Adults Of The Family Hydropsychidae (Trichoptera) In West Virginia, Toni Ann Phillips
A Distributional And Taxonomic Study Of The Adults Of The Family Hydropsychidae (Trichoptera) In West Virginia, Toni Ann Phillips
Theses, Dissertations and Capstones
A survey of the adult Hydropsychiclae revealed 39 species, 14 of which were state records. The adult hydropsychids were collected from various locations throughout West Virginia. The most common species Hydropsychidae were Hydropsyche morosa, H. sparna, Cheumatopsyche analis, C. campyla, and Diplectrona modesta. Most of the species did not appear to be limited to any one particular drainage basin. Several species exhibited a preference for stream order (headwaters, middlereaches, large rivers). Aphropsyche monticola, Parapsyche apicalis, Cheumatopsvche wrighti, C, gyra, and Hydropsyche alhedra preferred the fast-flowing headwater streams in the higher elevations of the state. Macrostemum zebratum, Potomyia flava, Hydropsyche phalerata, …
The Voluntary Water Quality Monitoring Program : 1982 Project Report, Barbara Welch, Judy Potvin, Mary Ellen Dennis
The Voluntary Water Quality Monitoring Program : 1982 Project Report, Barbara Welch, Judy Potvin, Mary Ellen Dennis
Maine Collection
The Voluntary Water Quality Monitoring Program : 1982 Project Report
by Barbara Welch, Judy Potvin & Mary Ellen Dennis
Division of Environmental Evaluation and Lake Studies, Maine Department of Environmental Protection, Augusta, Maine 1982.
Contents: Understanding Maine's Lakes and Ponds / Acknowledgement / Temperature / Dissolved Oxygen / Other Measures of Lake Water Quality / Nutrients / Algae and Chlorophyll a / Transparency / Morphometry / Sampling / Protection / Classification / Answers to Most Frequently Asked Questions / Glossary of Terms / Appendix A : Maximum, Minimum, and Mean Values / Appendix B : Phosphate Content of Common Cleansers …
The Bead Game: Response Strategies In Free Assortment, Alan B. Bond
The Bead Game: Response Strategies In Free Assortment, Alan B. Bond
Alan Bond Publications
Subjects were presented with a collection of spherical beads of four different colors and were instructed to sort them as fast and as accurately as possible. The sequence in which the beads were sorted was recorded, along with the time intervals between successive beads. Subjects were observed to sort in nonrandom sequences, producing runs in which a given bead type was taken exclusively. The speed and accuracy of the sorting process was positively correlated with the degree of nonrandomness of the sorting sequence. This relationship appeared to be primarily attributable to perceptual factors involved in the initiation of a run …
Understory-Overstory Vegetation Relationships: An Annotated Bibliography, Peter F. Ffolliott, Warren P. Clary
Understory-Overstory Vegetation Relationships: An Annotated Bibliography, Peter F. Ffolliott, Warren P. Clary
Aspen Bibliography
No abstract provided.
Soil Traversing Arthropod Populations As Sampled By Pitfall Traps In Sunflower And Three Adjacent Habitats In Northeast Arkansas, Linda A. Lee, Harvey E. Barton
Soil Traversing Arthropod Populations As Sampled By Pitfall Traps In Sunflower And Three Adjacent Habitats In Northeast Arkansas, Linda A. Lee, Harvey E. Barton
Journal of the Arkansas Academy of Science
Soil traversing arthropod populations were sampled by pitfall traps in sunflower (Helianthus spp.) and three adjacent habitats during the months of July, August and September of 1980 and May, June, July and August of 1981. In1980, four varieties of sunflower (Ellar, Hybrid 670, 891 and S-345) were planted. A single variety of sunflower (Ellar) was planted in1981. The three adjacent habitats in both 1980 and 1981 were a pine stand, grass border and fence row. Of 1,748 specimens collected in 1980, 17 orders and 48 families were represented. Four orders comprised 78% of the total catch: Hymenoptera (45%), Acari (17%), …
Effects Of Water Released From Stratified And Unstratified Reservoirs On The Downstream Water Quality, Stephen B. Smith
Effects Of Water Released From Stratified And Unstratified Reservoirs On The Downstream Water Quality, Stephen B. Smith
Journal of the Arkansas Academy of Science
Water quality samples were collected from the Little River system in Pine Creek Lake, Oklahoma, and Gillham Lake, Arkansas, and their associated tailwaters during the winter (reservoirs unstratified) and summer (reservoirs stratified) of 1980. Downstream water quality was not affected by reservoir water releases while the reservoirs were unstratified. When the reservoirs were stratified water quality in the tailwaters was dependent on the release depth of the water. The practice of flushing out a tailwater following an extended low flow period should be examined on a site by site basis. Anoxic water released from a reservoir may contain high amounts …
Selection Of Breeding Ponds By The Ringed Salamander, Ambystoma Annulatum, Peter P. Brussock, Arthur V. Brown
Selection Of Breeding Ponds By The Ringed Salamander, Ambystoma Annulatum, Peter P. Brussock, Arthur V. Brown
Journal of the Arkansas Academy of Science
No abstract provided.
Cave Fauna Of Arkansas: Further Records, James D. Dunivan, C. Renn Tumlison, V. Rick Mcdaniel
Cave Fauna Of Arkansas: Further Records, James D. Dunivan, C. Renn Tumlison, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
No abstract provided.
Aquatic Macroinvertebrate Taxa Present In Two Ozark Springs In Randolph County, Arkansas, G. Randall Guntharp, George L. Harp
Aquatic Macroinvertebrate Taxa Present In Two Ozark Springs In Randolph County, Arkansas, G. Randall Guntharp, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Invertebrate Fauna Of Devils Den, A Sandstone Cave In Northwestern Arkansas, Stewart B. Peck, James H. Peck
Invertebrate Fauna Of Devils Den, A Sandstone Cave In Northwestern Arkansas, Stewart B. Peck, James H. Peck
Journal of the Arkansas Academy of Science
The same invertebrate fauna of 17 species was found in Devils Den Cave, Washington County, Arkansas, in 1969 and 1979. The fauna consists of 1 trogloxene, 14 troglophiles, and 2 troglobites, a spider, Porrhomma cavernicolum, and a collembolan, Pseudosinella dubia. Devils Den Cave has a well developed cavernicolous fauna, although it is in sandstone which generally supports a poor cave adapted fauna. The troglobites probably evolved in the vicinity of northwestern Arkansas in limestone caves or in deep forest soils of the Ozark region. They then dispersed overland, perhaps as recently as the late Wisconsinan, to occupy this sandstone cave.
The Extent And Characteristics Of Low Productivity Aspen Areas In Minnesota, Garhard K. Raile, Jerold T. Hahn
The Extent And Characteristics Of Low Productivity Aspen Areas In Minnesota, Garhard K. Raile, Jerold T. Hahn
Aspen Bibliography
No abstract provided.
An Experiment In Biomass Production: Results From Three Consecutive Harvests Of Cottonwood Alder, Constance A. Harrington, Dean S. Debell, Robert F. Strand
An Experiment In Biomass Production: Results From Three Consecutive Harvests Of Cottonwood Alder, Constance A. Harrington, Dean S. Debell, Robert F. Strand
Aspen Bibliography
No abstract provided.
Biomass Equations For Ten Major Tree Species Of The Prairie, T. Singh
Biomass Equations For Ten Major Tree Species Of The Prairie, T. Singh
Aspen Bibliography
No abstract provided.
Wildlife Conservation In The Soviet Union, Michael L. Wolfe, Douglas R. Weiner
Wildlife Conservation In The Soviet Union, Michael L. Wolfe, Douglas R. Weiner
Aspen Bibliography
No abstract provided.
Wildlife--Wild Death: Kenya's Man-Animal Equation, Norman N. Miller
Wildlife--Wild Death: Kenya's Man-Animal Equation, Norman N. Miller
Aspen Bibliography
Kenya's game laws, in comparison to those of ancient England, are tame and mild.
Evaluation Of Instream Flow Methodologies For Fisheries In Nebraska, Phil Hilgert
Evaluation Of Instream Flow Methodologies For Fisheries In Nebraska, Phil Hilgert
Nebraska Game and Parks Commission: Publications
Five instream flow methods were applied to a variety of streams within the state of Nebraska. These were (1) the Tennant method, (2) a modification of the Tennant method, (3) IFG1 A, a single cross-section average-parameter method, (4) the Incremental method, using the WSP hydraulic simulation program, and (5) the Incremental method, using the IFG4 hydraulic simulation program.
Each method was applied following standard published procedures, and instream flow recommendations were developed for the streams addressed using each method separately. Evaluation of the methods showed that the modification of the Tennant method overcame some of the deficiencies of the Tennant …
Warmwater Fish Community Of A Cool Tailwater In Arkansas, Richard A. Frietsche
Warmwater Fish Community Of A Cool Tailwater In Arkansas, Richard A. Frietsche
Journal of the Arkansas Academy of Science
A diverse warmwater fish community has persisted in the Lake Greeson tailwater, despite hydropower releases of cold hypolimnetic water. Forty-eight species of fish were collected by electrofishing in the upper 16.1 km of the tailwater. Hydropower releases have reduced the abundance of some of the warmwater sport fish in the upper tailwater, and their populations are probably maintained in part by recruitment from downstream. Angling effort has been diverted from the warmwater sport fish populations to a put-and-take trout fishery.
Endemic Flora And Fauna Of Arkansas, Henry W. Robison, Kenneth L. Smith
Endemic Flora And Fauna Of Arkansas, Henry W. Robison, Kenneth L. Smith
Journal of the Arkansas Academy of Science
Arkansas has an amazing diversity of plants and animals contained within its political boundaries. Forty-seven taxa are reported as Arkansas endemics, including seven plants, thirteen crustaceans (two amphipods, three isopods, eight crayfishes), nine insects (one mayfly, one caddisfly, three stoneflies, four beetles), ten snails, six fishes, and two salamanders.
Water Quality And Benthic Invertebrate Communities In Lake Greeson Tailwater, Stephen B. Smith
Water Quality And Benthic Invertebrate Communities In Lake Greeson Tailwater, Stephen B. Smith
Journal of the Arkansas Academy of Science
The Little Missouri River below Lake Greeson, Arkansas, was sampled for water quality and benthos during summer 1979. The hydropower turbine water intakes, 20 m below the lake surface, released hypolimnetic water into the tailwater. Downstream water temperatures, total organic matter, and total inorganic matter varied considerably and benthic invertebrate communities immediately below the dam were stressed by waters released for power generation. Detrimental effects from altered temperature and flow regimes had decreased by 16.1 km downstream, where invertebrate communities were typical of less stressed environments.
River Otter In Arkansas: Ii. Indications Of A Beaver-Facilitated Commensal Relationship, C. Renn Tumlison, Mark R. Karnes, Anthony W. King
River Otter In Arkansas: Ii. Indications Of A Beaver-Facilitated Commensal Relationship, C. Renn Tumlison, Mark R. Karnes, Anthony W. King
Journal of the Arkansas Academy of Science
Dam building activities of beaver (Castor canadensis) create ponds that apparently augment habitat available to otter (Lutra canadensis). This paper considers possible effects of beaver activity and pond formation on distribution and populations of otter in Arkansas. Literature synthesis and analysis of harvest records were used to investigate the suspected relationship.
Response Strategies In The Radial Arm Maze: Running Around In Circles, Sonja I. Yoerg, Alan C. Kamil
Response Strategies In The Radial Arm Maze: Running Around In Circles, Sonja I. Yoerg, Alan C. Kamil
Papers in Behavior in Biological Sciences
The effects of the size of the central arena on the use of response strategies by rats on an eight~arm elevated maze were examined. The size of the central arena had no effect on accuracy, but the use of adjacent arms increased significantly with a larger central arena, regardless of the size of arena to which rats were first exposed. These results are interpreted in terms of foraging efficiency.
Spatial Learning As An Adaptation In Hummingbirds, Susan Cole, F. Reed Hainsworth, Alan Kamil, Terre Mercier, Larry L. Wolf
Spatial Learning As An Adaptation In Hummingbirds, Susan Cole, F. Reed Hainsworth, Alan Kamil, Terre Mercier, Larry L. Wolf
Avian Cognition Papers
An ecological approach based on food distribution suggests that hummingbirds should more easily learn to visit a flower in a new location than to learn to return to a flower in a position just visited, for a food reward. Experimental results support this hypothesis as well as the general view that differences in learning within and among species represent adaptations.
Distribution Ecology: Variation In Plant Recruitment Over A Gradient In Relation To Insect Seed Predation, Svata M. Louda
Distribution Ecology: Variation In Plant Recruitment Over A Gradient In Relation To Insect Seed Predation, Svata M. Louda
Svata M. Louda Publications
Although predispersal seed predation by insects is common, no test exists of its effect on plant recruitment. This study examines seed predation in the population dynamics of a native, temperate shrub, Haplopappus squarrosus H. and A. (Asteraceae), over an elevational gradient in the coastal sage scrub vegetation of San Diego County, California, USA. Frequency and abundance of H. squarrosus increase from coast to mountains. Expected abundance, based on flowers initiated, was highest at the coast and lowest in the interior, the opposite of the observed adult plant distribution. Overall flower and seed predation by insects was high (44-73%) and was …
The Multi-Individual Cremation Phenomenon Of The Santa Cruz Drainage, Karl J. Reinhard, T Michael Fink
The Multi-Individual Cremation Phenomenon Of The Santa Cruz Drainage, Karl J. Reinhard, T Michael Fink
Karl Reinhard Publications
Multi-individual cremation deposits found in the upper Santa Cruz River drainage were previously interpreted as the result of hypothesized cultural contact in the area. A review of 50 cremation deposits for which detailed analyses are available indicates that mulii-individual cremation deposits are the result of incomplete gleaning practices and have doubtful cultural significance. Hypotheses are generated from the present data which account for the apparent variation in cremation practices within the study area.