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1201 - 1225 of 1229 Items << < 44 45 46 47 48 49 50 > >>
1201 - 1225 of 1229 Items << < 44 45 46 47 48 49 50 > >>
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Microtus canicaudus Miller, the gray-tailed vole, was studied
in the field and laboratory in order to clarify aspects of the relationship
of this species to its habitat. All trapping and sampling was done
on permanent pasture land in the William...
1972-05-02 (iso8601)
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Improved accessibility in remote noble fir (Abies procera Rehd.) stands and the
realization of the value of noble fir wood have led to increased pressure to enter and
actively manage noble fir stands in Oregon and Washington. This study examined...
1997-04-04 (iso8601)
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Windthrow has been studied extensively as a cause of mortality and as a landscape
disturbance agent in temperate forests throughout the United States. The effects of
windthrow mortality on stand species composition and structure, forest...
2005-06-03 (iso8601)
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This project explores mechanisms governing the invasion of fluvial systems by two
contrasting exotic species in stream networks of steep, relatively remote forested landscapes
of western Oregon. This research addresses hypotheses relating...
2004-02-24 (iso8601)
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Intrinsic and extrinsic factors affect vital rates and population-level processes, and understanding these factors is paramount to devising successful management plans for wildlife species. For example, birds time migration in response, in part,...
2015-10 (iso8601)
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Season affects many characteristics of populations and, as a result, the interpretations of surveys conducted at
different seasons. We explored seasonal variation in occupancy using data from four studies on the Pacific marten
Martes caurina....
2015-03 (iso8601)
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A mathematical model was developed to simulate the nitrogen limited growth dynamics of phytoplankton in a stratefied embayment. The representation of biological growth dynamics includes consideration of...
1975-01-01
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The portion of the Oregon coast extending from Cape Blanco south
into California has long been recognized as a distinct physiographic region,
with probable ramifications for prehistoric subsistence and settlement
patterns. Several researchers have...
1990-04-13 (iso8601)
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This paper focuses on the consequences of managing small-scale fisheries without consideration of geographical differentiation in reproductive potential through a species range. Because fishing costs
increase with distance, the alternative port...
2008 (iso8601)
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A general Limnological Survey was made of the Navasota River, Texas, a tributary of the Brazos River, between February, 1968 and March, 1970. Five stations on the main channel were visited twice monthly from February, 1968 to January, 1970, and...
2011-07-01
2011-07-01 1973-12-01 |
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Many sports fields developed in the El Paso Valley and some in uplands became salinized when irrigated with water containing 800 to 1,200 mg/L of dissolved salts. The soil types, which were salinized, include compacted soils, clayey Entisols,...
2009-01-12
2009-01-12 2008-02-01 |
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Pacific cod (Gadus macrocephalus) is an important species, both economically and ecologically in the Bering Sea and Aleutian Islands (BSAI). However, little is known about its spawning dynamics. To address this knowledge gap, I developed a gross...
2012-07-30 (iso8601)
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Stream-restoration projects are usually designed to improve habitat quality for fishes.
These projects manipulate flow patterns, substrate distribution, and amount and
placement of large woody debris. Consequently, they also affect the size and...
1996-02-09 (iso8601)
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Forest Lands
Forest lands of the Columbia River Basin administered by the Department may be divided into two groups. One consists of unappropriated and unreserved public lands both within and outside of grazing districts ; the second is made up...
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Perch and trout are residents of the lake behind American Falls Dam, and bass and perch are taken from the Walcott Reservoir.
Wildlife.—Mule deer, widely distributed throughout the upper basin, are the most common big game. Locally, in the...
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Document: Appendix to Pacific Southwest Water Plan of August 1963 as modified January 1964 "Bureau of Land Management Appendix", January 1964, page 15
1964-01-01
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Mat-forming ectomycorrhizal (EcM) fungi represent a prevalent constituent of many
temperate forest ecosystems and create dramatic changes in soil structure and
chemistry. EcM mat soil have been shown to have increased microbial respiration
rates...
2012-05-17 (iso8601)
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The ascomycete Geosmithia morbida and the walnut twig beetle Pityophthorus juglandis are associated with thousand
cankers disease of Juglans (walnut) and Pterocarya (wingnut). The disease was first reported in the western United States
(USA) on...
2014-11-13 (iso8601)
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