Results
1151 - 1175 of 1229 Items << < 42 43 44 45 46 47 48 49 50 > >>
1151 - 1175 of 1229 Items << < 42 43 44 45 46 47 48 49 50 > >>
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A classification of forest vegetation is presented for the Mt. Baker-snoqualmie Forest. It is based on the potential National vegetation and uses the plant association as the basic unit. The classification is based on 2464 sample plots distributed...
2010-05-27T20:52:12Z (iso8601)
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A classification of forest vegetation is presented for the Colville National Forest in northeastern
Washington State. It is based on potential vegetation with the plant association as the basic unit. The
classification is based on a sample of...
1995-10 (iso8601)
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My thesis explored the effects of environmental variability on population
dynamics and community composition of aquatic insects. Environmental variability in
the form of flow regime in streams can limit the distribution and life-history traits of...
2010-01-20T21:48:54Z (iso8601)
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The Oregon State Game Commission’s Basin Investigations Section began studies in the Upper Willamette Basin relevant to this report in the spring of 1964. These investigations were continued into 1966. Primary objectives were to define water...
1966-06 (iso8601)
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The microsporidian parasite, Pseudoloma neurophilia, is the most commonly diagnosed infectious disease in laboratory populations of the zebrafish, Danio rerio. Infections by P. neurophilia are generally subclinical, however, they can become acute...
2013-09-03 (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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A variety of laser spectroscopic methods are employed in this
thesis research for studies of CF₃NO, an interesting model
photodissociative system, and for investigation of low energy rotations
and vibrations of small molecules and low molecular...
1986-07-23 (iso8601)
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This study measures the recreational boating use in Prince William Sound,
Alaska. Improved access conditions to the Sound over the last decade coupled with a
statewide increase in outdoor recreation participation among both resident and out of...
2007-08-28T17:51:00Z (iso8601)
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Few studies have examined both long-term and fine-scale spatial variations in
water quality of small streams in the Pacific Northwest. As such, a case study was
conducted to determine if current physical and chemical properties of water in three...
2007-07-16T21:46:26Z (iso8601)
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Trophic interactions within and among species vary widely across spatial scales and species’ ontogeny. However, the drivers and implications of this variability are not well understood. Juvenile Chinook salmon Oncorhynchus tshawytscha have a wide...
2015-10-14 (iso8601)
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The sustainable yield function is a favoured tool in fisheries policy making. Normally, this function is drawn as a continuous curve in effort-yield space. This means that sustainable yield (harvest) is gradually reduced to zero as fishing effort...
2008 (iso8601)
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Morton J. Elrod was an early Montana
botanist, naturalist, University of Montana professor, and photographer. The
collection consists of materials produced and collected by Elrod from his
college and early teaching years through the...
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Macronutrients persist in the surface layer of the equatorial Pacific Ocean because the production of phytoplankton is limited; the nature of this limitation has yet to be resolved. Measurements of photosynthesis as a function of irradiance (P-I)...
1992-01-15 (iso8601)
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A new in situ fluorometer for the detection of oceanic photosynthetic pigment fluorescence is described.
Emission spectra from 546 to 733 nm are recorded for each of three different visible excitation bands ten
times a second. A Spectralon cell is...
1997-02-20 (iso8601)
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California's Central Valley agricultural landscapes provide several important wintering regions for Pacific Flyway sandhill crane (Grus canadensis) populations; however, the value of those regions is being compromised by urban expansion, other...
2015-03-06 (iso8601)
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Continental shelves located along eastern boundary currents occupy relatively small volumes of the world’s oceans, yet are responsible for a large proportion of global primary production. The Oregon coast is among these ecosystems. Recent analyses...
2012-04-12 (iso8601)
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1982-2002; ill., maps; Title covers calendar years 1985-1987; CA 9000-3-0003 Subagreement 12; Includes bibliographic references; Issues lack volume numbering
1986-05-21
2009-01-06 2009-03-23 |
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A study of the population ecology of Columbia River fall chinook
salmon, Oncorhynchus tshawytscha (Walbaum), was made in an attempt
to determine the cause of a serious decline in this run which occurred
in the early 1950's. Fluctuations in...
1968-05-03 (iso8601)
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Research on the distribution of juvenile salmonids in streams has been
dominated by studies examining small areas over short periods. However,
information relevant to freshwater influences on population persistence is likely to
derive from...
2001-07-11 (iso8601)
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A cytogeographical study was made of populations of tetraploid
(n=18) and hexaploid (n=27) Achillea millefolium (Compositae-
Anthemideae) from the Pacific Coast states. There is a complex
distributional pattern, involving overlapping ranges, mixed...
1969-12-10 (iso8601)
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Climate and marine ecosystem research informs us that marine fish resources would come under increasing stress over the course of the 21st century as global climate change, ocean acidification and de-oxygenation combine with other stresses on the...
2012 (iso8601)
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Water temperature is an important measure of water quality, as well as a dominant factor affecting aquatic life within the stream environment. Elevated water temperatures can decrease the survival rate of fish in each life stage. Cold water...
2009-09-21T16:03:11Z (iso8601)
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