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476 - 500 of 1229 Items << < 15 16 17 18 19 20 21 22 23 24 > >>
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A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an...
2009-06-15T17:57:56Z (iso8601)
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Desert plant communities are among the most sensitive to changes in soil water conditions. In areas with shallow aquifers, it is important to understand both the effects of groundwater alterations on vegetation and how changes in surface-soil...
2013-05-02 (iso8601)
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The nature of the interaction between juvenile coho salmon, Oncorhynchus kisutch (Walbaum), and fall chinook salmon, 0. tshawytscha (Walbaum), was studied in Sixes River, Oregon. Seining, snorkeling, and tagging were used to determine distribution...
1971-05-06 (iso8601)
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The quantity and characteristics of coarse woody debris (CWD) were examined
in four distinct pine ecosystems of north-western (NW) Spain, NW Russia and
the NW USA. The average CWD volume and biomass ranged from 3.76 m³ ha⁻¹,
1.55 Mg ha⁻¹ in pine...
2013-10-28 (iso8601)
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The study was carried out in Anyigba, North central
Nigeria to analyze the distribution, marketing and
consumption
of sea food. It specifically sought to describe the
socio-economic characters of the fish marketers and consumers,
identify the...
2012 (iso8601)
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Given the variable effects of Myxobolus cerebralis (the parasite that causes whirling disease) on trout populations in different streams across the intermountain West, it is important to understand the role of environmental variation in...
2004-01-01
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Mesoscale fronts occur frequently in many coastal areas and often are sites of elevated
productivity; however, knowledge of the fine-scale distribution of zooplankton at these
fronts is lacking, particularly within the mid-trophic levels....
2014-09-09 (iso8601)
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The objectives of this study were to quantify and describe:
(1) the major plant communities and their distribution, (2) the
distribution and movement patterns of large herbivores relative to
water, topography, and plant communities, (3) the daily...
1983-09-19 (iso8601)
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Freshwater mussels are the most threatened taxonomic group in North America with extinction rates that exceed those of many species found in both terrestrial and freshwater ecosystems including fish, birds, and amphibians. Part of the reason that...
2012-05-01
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1. The distribution of genetic variation can be interpreted to understand the timing and mechanisms of invasive species spread. Allee effects, positive relationships between fitness and density or number of conspecific individuals, can play a...
2010-01-01
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This study examined the logbook record of the Oregon trawl fishery using a geographic information system (GIS) to determine the spatial and temporal distribution of English sole, Pleuronectes vetulus. The original logbook data for the years...
2000-03-10 (iso8601)
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ill.; Typescript (photocopy); Thesis (M.S.)--Oregon State University, 1988; Includes bibliographical references (leaves 144-155)
1988-09-21
2009-07-10 2009-11-02 |
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Descriptions of the fire regime in the Douglas-fir/western hemlock region of the Pacific Northwest traditionally have emphasized infrequent, predominantly stand-replacement fires and an associated linear pathway of stand development, where all...
2010-09-03T16:00:24Z (iso8601)
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The Least Brook Lamprey has been considered a "threatened" species in Illinois since 1989 due to its limited distribution and presumed rarity. I investigated the distribution, abundance, and reproduction of this species in southern Illinois from...
2007 (iso8601)
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Recruitment of larvae from the plankton is an important determinant of
community structure in marine systems. In populations of many marine species,
recruitment determines the basic demographic parameters of immigration, emigration,
and...
2011-09-23 (iso8601)
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Although climate acts as a fundamental constraint on the distribution of
organisms, understanding how this relationship between climate and distribution varies over a
species’ range is critical for addressing the potential impacts of accelerated...
2013-06 (iso8601)
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Interannual variability of Humboldt squid (Dosidicus gigas) occurrence in the
northern California Current System is largely unknown. In Oregon, the distribution of
this versatile predator and what is influencing their range expansion from Mexico...
2012-09-04 (iso8601)
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The microdistribution of the amphipod Eohaustorius brevicuspis was
examined over a 19 month period. Field sampling was conducted principally
at Lost Creek State Park, Oregon, and on one occasion at Driftwood State
Park, Oregon. Both are...
1979-04-13 (iso8601)
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Biodiversity losses in terrestrial, freshwater, and marine systems are accelerating at a global scale and the most threatened vertebrate taxa are those associated with freshwater habitats. The causes of biodiversity losses are often complex and...
2014-12-02 (iso8601)
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Twelve plots at six sites in southwestern Oregon were studied to determine the degree to which various soil characteristics are related to the occurrence and growth of Chamaecyparis lawsoniana and Thuja plicata. Soil profiles and vegetation were...
1980-07-07 (iso8601)
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1. The distribution of genetic variation can be interpreted to understand the timing and mechanisms of invasive species spread. Allee effects, positive relationships between fitness and density or number of conspecific individuals, can play a...
2010-01-01
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University of
Washington professor of zoology and author of several works on the ecology of
Lake Washington.; Walles Thomas Edmondson was born in 1916 in Milwaukee Wisconsin. He
attended Yale University and the University of Wisconsin....
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The Frank E. Moss papers (1931-1992) contain congressional papers of Senator Frank E. Moss, 1959-76, covering the 86th-93rd Congress, and personal files, 1935-76. Besides the congressional files the papers include biographical information,...
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The species composition, distribution and concentration of ichthyoplankton off the central Oregon coast in the NE Pacific Ocean were examined during 2000 and 2002 to investigate annual, seasonal, vertical, and cross-shelf variability. Larval...
2006-08-18 (iso8601)
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