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

Digital Commons Network™

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

Environmental Sciences

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 18121 - 18150 of 22692

Full-Text Articles in Entire DC Network

Water Quality In East Pond: Factors Contributing To Algal Blooms And Strategies For Remediation, Problems In Environmental Science Course (Biology 493), Colby College, Colby Environmental Assessment Team, Colby College Jan 1999

Water Quality In East Pond: Factors Contributing To Algal Blooms And Strategies For Remediation, Problems In Environmental Science Course (Biology 493), Colby College, Colby Environmental Assessment Team, Colby College

Colby College Watershed Study: East and North Ponds (2011, 1999, 1996, 1991)

Human activity within the watershed can greatly accelerate the eutrophication process by increasing the rate at which nutrients such as phosphorus and nitrogen enter the lake (Fernandez et al. 1992). Increased nutrient loading causes dramatic increases in algal populations resulting in algal blooms. Many New England lakes develop a greenish tint because of algal blooms during early summer or early fall (Smith, 1992). Populations of bacteria which feed on organic material rise because of increased food supply. Bacterial activity decreases the level of dissolved oxygen in the lake (Henderson-Seller and Markland, 1987). This process has occurred in East Pond and …


Notes And Correspondence: The Effects Of Data Gaps On The Calculated Monthly Mean Maximum And Minimum Temperatures In The Continental United States: A Spatial And Temporal Study, David E. Stooksbury, Craig D. Idso, Kenneth G. Hubbard Jan 1999

Notes And Correspondence: The Effects Of Data Gaps On The Calculated Monthly Mean Maximum And Minimum Temperatures In The Continental United States: A Spatial And Temporal Study, David E. Stooksbury, Craig D. Idso, Kenneth G. Hubbard

School of Natural Resources: Faculty Publications

Gaps in otherwise regularly scheduled observations are often referred to as missing data. This paper explores the spatial and temporal impacts that data gaps in the recorded daily maximum and minimum temperatures have on the calculated monthly mean maximum and minimum temperatures. For this analysis 138 climate stations from the United States Historical Climatology Network Daily Temperature and Precipitation Data set were selected. The selected stations had no missing maximum or minimum temperature values during the period 1951–80. The monthly mean maximum and minimum temperatures were calculated for each station for each month. For each month 1–10 consecutive days of …


The Relative Importance Of Patch Area And Perimeter–Area Ratio To Grassland Breeding Birds, Christopher J. Helzer, Dennis E. Jelinski Jan 1999

The Relative Importance Of Patch Area And Perimeter–Area Ratio To Grassland Breeding Birds, Christopher J. Helzer, Dennis E. Jelinski

School of Natural Resources: Faculty Publications

Habitat fragmentation has been implicated as a major cause of population decline in grassland birds. We tested the hypothesis that a combination of area and shape determines the use of grassland patches by breeding birds. We compared both species richness and individual species presence in 45 wet meadow grasslands in the floodplain of the central Platte River, Nebraska. Bird data were collected through the use of belt transects and supplemented by walking and listening outside transects. Our data supported our primary hypothesis that perimeter–area ratio, which reflects both the area and shape of a patch, is the strongest predictor of …


Grazing Arizona: Public Land Management In The Southwest, Char Miller Jan 1999

Grazing Arizona: Public Land Management In The Southwest, Char Miller

Pomona Faculty Publications and Research

In February of 1999, the chief of the U.S. Forest Service, Michael Dombeck, placed a moratorium on road building on most roadless areas. In October, President Clinton put forth an initiative to prohibit road building on 40 million acres of roadless area. Such modifications in Forest Service land management decisions is not new as suggested by Char Miller in this look back at early grazing decisions by Pinchot. To be proactive and reactive at the same time in relation to changing social pressures and political realties may be the legacy of the agency.


Effect Of Human Disturbance On Small Mammal Communities In Itasca State Park, Minnesota, Nancy L. Staus, Kathleen Conforti, Leslie N. Clapper, Jennifer A. Longhenry, C. C. Schoenbauer, Michael S. Rentz, John R. Tester Jan 1999

Effect Of Human Disturbance On Small Mammal Communities In Itasca State Park, Minnesota, Nancy L. Staus, Kathleen Conforti, Leslie N. Clapper, Jennifer A. Longhenry, C. C. Schoenbauer, Michael S. Rentz, John R. Tester

Journal of the Minnesota Academy of Science

We determined effects of different levels of human disturbance on small mammal richness and relative abundance from live-trapping data obtained in Itasca State Park in northwestern Minnesota. We developed a quantitative measure of human disturbance based on disturbance units and trapped small mammals on three study sites, each reflecting a different level of disturbance. Our data revealed that small mammal diversity decreased with increasing human disturbance. Amount of ground cover and litter depth also appeared to be important in explaining differences in the demographic patterns of small mammals among sites.


The Role Of Trust In The North Blackforest: An Evaluation Of A Citizen Panel Project, Ragnar E. Löfstedt Jan 1999

The Role Of Trust In The North Blackforest: An Evaluation Of A Citizen Panel Project, Ragnar E. Löfstedt

RISK: Health, Safety & Environment (1990-2002)

Dr. Löfstedt explores the effectiveness of a public participation project conducted in Germany, designed to involve citizens in the siting of municipal waste disposal plants.


Analysis Of Institutional Innovation In The Natural Resources And Environmental Realm: The Emergence Of Alternative Problem-Solving Strategies In The American West, Douglas S. Kenney, William B. Lord, University Of Colorado Boulder. Natural Resources Law Center Jan 1999

Analysis Of Institutional Innovation In The Natural Resources And Environmental Realm: The Emergence Of Alternative Problem-Solving Strategies In The American West, Douglas S. Kenney, William B. Lord, University Of Colorado Boulder. Natural Resources Law Center

Books, Reports, and Studies

x, 109 p. ; 28 cm


Outside Four Walls: Implementing Environmental Education Out-Of-Doors On School Campuses, Diane Marie Bruns Jan 1999

Outside Four Walls: Implementing Environmental Education Out-Of-Doors On School Campuses, Diane Marie Bruns

Theses Digitization Project

No abstract provided.


Procedure For Raising Trout In The Classroom As Part Of Environmental Education, Ronn Chapman Jan 1999

Procedure For Raising Trout In The Classroom As Part Of Environmental Education, Ronn Chapman

Theses Digitization Project

No abstract provided.


The Probe, Issue 196 – January 1999 Jan 1999

The Probe, Issue 196 – January 1999

The Probe: Newsletter of the National Animal Damage Control Association

A History of the Wildlife Services Program -- Donald W. Hawthorne, Gary L. Nunley, and Vivian Prothro, USDA-APHIS-Wildlife Services, Oklahoma and Texas
Position Available: Postdoctoral Research Associate, U.S.D.A. Agricultural Research Service, Stuttgart National Aquaculture Research Center (SNARC) in Stuttgart, Arkansas.
Book Review: "Being Kind to Animal Pests: A No-Nonsense Guide to Humane Animal Control with Cage Traps" by Steve Meyer (self-published), Garrison, I A 1991. 132 pages.
Position Announcement: Post Graduate Researcher, Dept. of Wildlife, Fish and Conservation Biology, University of California, Davis
Scmidt Appointed to AVMA Panel on Euthanasia

Abstracts from the 5th Annual Conference of The Wildlife Society, …


Water Resources Management Plan Arches National Park And Canyonlands National Park, United States Department Of The Interior National Park Service Jan 1999

Water Resources Management Plan Arches National Park And Canyonlands National Park, United States Department Of The Interior National Park Service

All U.S. Government Documents (Utah Regional Depository)

This Water Resources Management Plan describes the water resources of Arches and Canyonlands National Parks and the issues affecting them. This plan provides detailed descriptions of the hydrologic environment in both parks, discussion of management issues developed in two scoping sessions, and management directives in the form of project statements. Typically, a Water Resources Management Plan is preceded by a scoping meeting held at the park. In this case, the Southeast Utah Group of parks (Southeast Utah Group), which includes Arches National Park, Canyonlands National Park, and Natural Bridges National Monument, held two scoping meetings. The first scoping session, held …


The Effect Of Mechanical Noise And Natural Sound On Visitor Experiences In Units Of The National Park System, Dr. James Gramann, National Park Service, U.S. Department Of The Interior Jan 1999

The Effect Of Mechanical Noise And Natural Sound On Visitor Experiences In Units Of The National Park System, Dr. James Gramann, National Park Service, U.S. Department Of The Interior

All U.S. Government Documents (Utah Regional Depository)

This paper reviews research on the effects of mechanical noise and natural sound on visitor experiences in national parks. Three approaches to studying noise impacts are described. Most noise research to date has addressed the impact of air-tour overflights on visitor experiences. these impacts are localized with significant percentages of visitors in some parks reporting interference with natural sounds from aircraft noise. Research also shows that unthreatening natural environments can have significant stress-reducing effects for many people. However, it is unclear if these effects are due to hearing the sounds of nature or to a combination of hearing and seeing …


Water Resources Management Plan: Arches National Park & Canyonlands National Park, Utah, Lynn Cudlip, Kevin Berghoff, David Vana-Miller Jan 1999

Water Resources Management Plan: Arches National Park & Canyonlands National Park, Utah, Lynn Cudlip, Kevin Berghoff, David Vana-Miller

All U.S. Government Documents (Utah Regional Depository)

The National Park Service recognizes the importance of preserving, conserving, and protecting water resources within its boundaries. Water resources, whether as large as the Colorado River or as small as a seep in Ernie's Country of Canyonlands National Park, play a distinctive role in linking ecosystems and , in general, provide habitat for a number of organisms. To protect park water resources, the Natinoal Park Service initiated a Water REsources Planning Program in 1991. The planning program provides an essential step in developing a comprehensive understanding of a park's hydrological system and the complex resource issues which surround it. The …


Preliminary Analysis Of The Management Situation, Land And Resource Management Plan Revision, United States Department Of Agriculture, Forest Service Jan 1999

Preliminary Analysis Of The Management Situation, Land And Resource Management Plan Revision, United States Department Of Agriculture, Forest Service

Natural Resources-Planning, Management, and Conservation

The Uinta Forest Plan (officially entitled Land and Resource Management Plan of the Uinta National Forest) is the document that establishes general management direction for lands administered by the Uinta National Forest. Using broad language, the Forest Plan determines the availability of land for resource management, predicts levels of resource use and outputs, and provides for a variety of resource management practices. The Uinta National Forest completed its current Forest Plan in October, 1984.


Characterization And Improvement Of Eos Land Products Using Measurements At Ameriflux Grassland And Wheat Sites In The Arm/Cart Region: Research Annual Performance Report For Period March 1, 1999- February 29, 2000., E. A. Walter-Shea, S. B. Verma Jan 1999

Characterization And Improvement Of Eos Land Products Using Measurements At Ameriflux Grassland And Wheat Sites In The Arm/Cart Region: Research Annual Performance Report For Period March 1, 1999- February 29, 2000., E. A. Walter-Shea, S. B. Verma

School of Natural Resources: Documents and Reviews

No abstract provided.


Classification Of Explosives Transformation Products In Plant Tissue, Steven L. Larson, Robert P. Jones, Lynn Escalon, Don Parker Jan 1999

Classification Of Explosives Transformation Products In Plant Tissue, Steven L. Larson, Robert P. Jones, Lynn Escalon, Don Parker

United States Army Corps of Engineers, Omaha District

Explosives contamination in surface or groundwater used for the irrigation of food crops and phytoremediation of explosives-contaminated soil or water using plant-assisted biodegradation have brought about concerns as to the fate of explosives in plants. Liquid scintillation counting, high-performance liquid chromatography, and gel permeation chromatography were utilized to characterize explosives (hexahydro-1,3,5-trinitro-1,3,5-triazine and trinitrotoluene) and their metabolites in plant tissues obtained from three separate studies. Analyzing tissues of yellow nutsedge (Cyperus esculentus), corn (Zea mays), lettuce (Lacuta sativa), tomato (Lyopersicum esculentum), radish (Raphanus sativus), and parrot feather (Myriophyllum aquaticum) …


Sloan-Kennally Timber Sale Final Environmental Impact Statement, United States Forest Service Jan 1999

Sloan-Kennally Timber Sale Final Environmental Impact Statement, United States Forest Service

Final Environmental Impact Statements (ID)

This Final EIS documents three alternatives analyzed for the Sloan-Kennally Timber Sale. The sale is to be offered in 2000 and administered by the McCall Ranger District of the Payette National Forest. The Sloan-Kennally sale planning area is located approximately 15 miles southeast of McCall. Alternatives include No Action, the Proposed Action, and Alternative 3, no timber harvest in the roadless area. The preferred alternative is the proposed action, which would harvest timber on 571 acres using tractor and helicopter logging systems. The mixture of silvicultural treatments is designed to mimic historic timber stand structure consisting of scattered large trees …


Final Environmental Impact Statement And Proposed Resource Management Plan For Public Lands Administered By The Bureau Of Land Management Newcastle Field Office, Newcastle, Wyoming, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Final Environmental Impact Statement And Proposed Resource Management Plan For Public Lands Administered By The Bureau Of Land Management Newcastle Field Office, Newcastle, Wyoming, United States Department Of The Interior, Bureau Of Land Management

Final Environmental Impact Statements (WY)

Enclosed is the Final Environmental Impact Statement (EIS) and Proposed Resource Management Plan (RMP) for Public Lands Administered by the Bureau of Land Management (BLM), Newcastle Field Office. This document presents the Proposed RMP for managing the public lands and resources in the Newcastle area. The proposed RMP is a refinement of the preferred alternative presented in the draft EIS published in March 1998.


Record Of Decision Carbon Basin Coal Project, United States Department Of Interior Bureau Of Land Management Jan 1999

Record Of Decision Carbon Basin Coal Project, United States Department Of Interior Bureau Of Land Management

Record of Decisions (WY)

The Final Environmental Impact Statement (FEIS) for the Carbon Basin Coal Project was released to the public on January 8, 1999. This document considered and evaluated the impacts of issuing the proposed Elk Mountain/Saddleback Hills competitive coal lease (WYW139975) under the provisions of 43 CFR 3425.1, as a lease by application (LBA). The area proposed for mining is a mixture of private, state, and federal surface and coal estates. If the applicant, Ark Land Company, is the successful bidder, they propose to mine surface and underground federal coal reserves along with their privately-owned coal to make an efficient and economical …


Classification Of Great Basin Plant Communities Occuring On Dugway Proving Ground, Utah, Verl Emrick, Alison Hill Jan 1999

Classification Of Great Basin Plant Communities Occuring On Dugway Proving Ground, Utah, Verl Emrick, Alison Hill

Elusive Documents

No abstract provided.


Management For The Red Gulch Dinosaur Tracksite Big Horn County, Wyoming, Environmental Assessment, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Management For The Red Gulch Dinosaur Tracksite Big Horn County, Wyoming, Environmental Assessment, United States Department Of The Interior, Bureau Of Land Management

Environmental Assessments (WY)

A review of existing land-use planning decisions is being conducted to evaluate how to best manage public lands, resources, educational opportunities, and other values associated with the recent discovery of dinosaur tracks on BLM-administered public lands near Shell, Wyoming. The tracks were not addressed in the Washakie Resource Management Plan (RMP) which was completed in 1988. A review of BLM's planning decisions for the discovery area is needed to evaluate the adequacy of existing management prescriptions for the protection of the tracks and related values.


Final Environmental Impact Statement Continental Divide/Wamsutter Ii Natural Gas Project, Sweetwater And Carbon Counties, Wyoming, United States Department Of The Interior, Bureau Of Land Management Jan 1999

Final Environmental Impact Statement Continental Divide/Wamsutter Ii Natural Gas Project, Sweetwater And Carbon Counties, Wyoming, United States Department Of The Interior, Bureau Of Land Management

Final Environmental Impact Statements (WY)

This Final Environmental Impact Statement (FEIS) assesses the environmental consequences of a proposed natural gas development project in eastern Sweetwater and southwestern Carbon Counties, Wyoming. This FEIS incorporates by reference most of the material presented in the Draft Environmental Impact Statement (DEIS) for the Continental Divide/Wamsutter II Natural Gas Project and is designed to be used with the DEIS.


1999 Platte River Basin Ecosystem Symposium Proceedings Jan 1999

1999 Platte River Basin Ecosystem Symposium Proceedings

Water Current Newsletter

No abstract provided.


Baleen Whales: Conservation Issues And The Status Of The Most Endangered Populations, Phillip Clapham, Sharon Young, Robert L. Brownell Jr. Jan 1999

Baleen Whales: Conservation Issues And The Status Of The Most Endangered Populations, Phillip Clapham, Sharon Young, Robert L. Brownell Jr.

United States Department of Commerce: Staff Publications

Most species of baleen whales were subject to intensive overexploitation by commercial whaling in this and previous centuries, and many populations were reduced to small fractions of their original sizes. Here, we review the status of baleen whale stocks, with an emphasis on those that are known or thought to be critically endangered. Current data suggest that, of the various threats potentially affecting baleen whales, only entanglement in fishing gear and ship strikes may be significant at the population level, and then only in those populations which are already at critically low abundance. The impact of some problems (vessel harassment, …


Hunting And Social Behaviour Of Leopard Seals (Hydrurga Leptonyx) At Seal Island, South Shetland Islands, Antarctica, Lisa M. Hiruki, Michael K. Schwartz, Peter L. Boveng Jan 1999

Hunting And Social Behaviour Of Leopard Seals (Hydrurga Leptonyx) At Seal Island, South Shetland Islands, Antarctica, Lisa M. Hiruki, Michael K. Schwartz, Peter L. Boveng

United States Department of Commerce: Staff Publications

The hunting behavior of leopard seals Hydrurga leptonyx was monitored opportunistically at Seal Island, South Shetland Islands, during the austral summers from 1986/87 to 1994/95. Leopard seals used several methods to catch Antarctic fur seal pups Arctocephalus gazella and chinstrap penguins Pygoscelis antarctica, and individuals showed different hunting styles and hunting success. One to two leopard seals per year were responsible for an average of 60% of observed captures of fur seal pups. Leopard seals preyed on penguins throughout the summer, but preyed on fur seal pups only between late December and mid-February. Hunting behavior differed significantly between different …


Sensitivity Of Fish Embryos To Weathered Crude Oil: Part Ii. Increased Mortality Of Pink Salmon (Oncorhynchus Gorbuscha) Embryos Incubating Downstream From Weathered Exxon Valdez Crude Oil, Ron A. Heintz, Jeffrey W. Short, Stanley D. Rice Jan 1999

Sensitivity Of Fish Embryos To Weathered Crude Oil: Part Ii. Increased Mortality Of Pink Salmon (Oncorhynchus Gorbuscha) Embryos Incubating Downstream From Weathered Exxon Valdez Crude Oil, Ron A. Heintz, Jeffrey W. Short, Stanley D. Rice

United States Department of Commerce: Staff Publications

We incubated pink salmon embryos under three exposure conditions, direct contact with oil-coated gravel, effluent from oil-coated gravel, and direct contact with gravel coated with very weathered oil (VWO). Embryo mortalities and polynuclear aromatic hydrocarbon (PAH) accumulation in embryo tissues during the direct-contact and effluent exposure experiments were not significantly different, indicating that PAH accumulation was mediated by aqueous transport. Mortality rates for embryos exposed initially to a total PAH concentration (TPAH) of 1.0 ppb were significantly higher than controls when the PAH were derived from VWO. The same aqueous TPAH concentration failed to increase mortality rates when the PAH …


Tws Wildlife Damage Management Working Group Newsletter: Winter 1999 - Volume 6(1) Jan 1999

Tws Wildlife Damage Management Working Group Newsletter: Winter 1999 - Volume 6(1)

TWS Wildlife Damage Management Working Group Newsletter

Forward -- Scott Craven; Next Edition Deadlines; 1999 Wildlife Damage Management Working Group Officers:; Tws 6th Annual Conference Working Group Sponsored Sessions; Proceedings Of The 18th Vertebrate Pest Conference Held March 2-5, 1998 In Costa Mesa, Ca Are Now Available; Announcing The Availability Of A New Publication And Video On Managing Urban Canada Geese; Wildlife Damage Management Around The World - Part 3; Application For Membership / The Wildlife Society


Tws Wildlife Damage Management Working Group Newsletter:Spring 1999 - Volume 6(2) Jan 1999

Tws Wildlife Damage Management Working Group Newsletter:Spring 1999 - Volume 6(2)

TWS Wildlife Damage Management Working Group Newsletter

Forward -- Scott Craven; 1999 Wildlife Damage Management Working Group Officers:; Contributors To This Issue; Wildlife Damage Management Around The World - Part 4; Wildlife Damage Management In Mexico; Next Edition Deadlines; Conditioned Food Avoidance For Predator Depredation Alert; Preliminary Program 6th Annual Conference * September 7-11, 1999; Tws 6th Annual Conference Working Group Sponsored Sessions; In Memory: William D. Fitzwater; Next Edition Deadlines; In Memoriam: Jack H. Berryman; A Wildlife Contraception Technical Review Committee; Call For Papers 19th Vertebrate Pest Conference; Application For Membership / The Wildlife Society


Tws Wildlife Damage Management Working Group Newsletter: Summer 1999 - Volume 6(3) Jan 1999

Tws Wildlife Damage Management Working Group Newsletter: Summer 1999 - Volume 6(3)

TWS Wildlife Damage Management Working Group Newsletter

Forward -- Scott Craven; Draft Agenda TWS Wildlife Damage Management Working Group; TWS 6th Annual Conference Working Group Sponsored Sessions; Preliminary Program 6th Annual Conference * September 7-11, 1999; TWS Nashville 2000 7th Annual Conference Of The Wildlife Society Nashville, Tennessee •September 12-16, 2000; An Empirical Model For Predicting Suburban Deer Populations; Application For Membership / The Wildlife Society


Tws Wildlife Damage Management Working Group Newsletter: Fall 1999 – Volume 6(4) Jan 1999

Tws Wildlife Damage Management Working Group Newsletter: Fall 1999 – Volume 6(4)

TWS Wildlife Damage Management Working Group Newsletter

Forward - Scott Craven; Minutes Of Tws’’ss Wildlife Damage Management Working Group 1999 Annual Meeting, Austin, Texas; A New Name And Format!!!!!!; 1999 Wildlife Damage Management Working Group Officers; Prospective Student; Wildlife Damage Conferences:: When,, Where,, And Why?; Stupid Pest Tricks -- ((Or What Your Best Extension Call Was All About)); The Electronics!!!!; WDAMAGE lListserv URBAN IPM llistserve; HDWILD listserv; FERALCAT Listserv The Prevention And Control Of Wildlife Damage Manual; NWCOA News ;Raccoon Roundworm Brochure; Beyond 2000:: Realiitiies Of Global Wolf Restoration;19th Vertebrate Pest Conference; Application for Membership / The Wildlife Society