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351 - 375 of 1229 Items << < 10 11 12 13 14 15 16 17 18 19 > >>
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A two phase investigation was undertaken in an attempt to determine the effects of variations in salinity on the distribution of benthic estuarine diatoms. The estuary studied was that of the Yaquina River which originates in the Coast Range of...
1970-04-24 (iso8601)
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This study was an investigation to determine the distribution, abundance and general food habits of salmonids and non-game fishes residing in several selected coastal streams, Douglas and Coos Counties, Oregon. The physical conditions that...
1982-03-12 (iso8601)
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Nearshore hypoxia along the coast of Oregon and Washington is a seasonal phenomenon that has generated concern among scientists studying this temperate upwelling ecosystem. These waters are affected by coastal upwelling-induced hypoxia mainly...
2015-11 (iso8601)
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The spatial distribution and abundance patterns of benthic infauna result from interactions with a host of environmental variables including sediment characteristics (percent silt-clay, grain size, total organic carbon), depth, temperature, and...
2013-08-27 (iso8601)
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Incidental bycatch in commercial fisheries has been identified as a threat to
black-footed albatrosses (Phoebastria nigripes) and Laysan albatrosses (P.
immutabilis). Effective long-term conservation of these albatrosses necessitates a
thorough...
2007-11-26 (iso8601)
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The objectives of this study are to: 1) study the variations
among stands of old-growth Sitka spruce forest located within a relatively
restricted geographical area, 2) determine the relationship between
species distribution, vegetational pattern,...
1982-03-12 (iso8601)
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The purpose of this study is to explore kernel machine learning methods for species distribution modeling. Previous studies have shown the success of Generalized Boosted Regression Models, however kernel methods have been unexplored for species...
2014-06-09 (iso8601)
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Title from cover; "May 1991"
1991-09-21
2004-10-21 2004-06-16 |
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The equilibrium response of Canadian vegetation to climate and climatic change was modeled at three organizational levels of the vegetation mosaic. The climatic parameters used as model drivers (i.e., snowpack, degree-days, minimum temperature,...
1992-10-28 (iso8601)
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The Sultanate of Oman has 1700 km of coastline extending from the Arabian Gulf
south to the Arabian Sea. The demersal fish distributions and assemblages have not previously
been well defined. In winter, variations in the oceanography of the area...
1994-11-29 (iso8601)
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Pacific sardines (Sardinops sagax) are an economically and ecologically important forage fish which transfer energy from planktonic primary producers and secondary consumers to upper trophic predators. Previous genetics studies of Pacific sardine...
2010-10-07T22:51:21Z (iso8601)
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Plecoptera were collected from four sampling stations selected
to represent a range of conditions on Oak Creek, a small woodland
stream originating in the foothills of the Oregon Coast Range. The
elevation of Site I was 700 ft. while the lowest...
1969-11-26 (iso8601)
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Understanding local and geographic factors influencing species distributions is a prerequisite for conservation
planning. Our objective in this study was to model local and geographic variability in elevations occupied by native
and nonnative...
2014-01-01 (iso8601)
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A study was conducted on German velvetgrass (Holcus mollis L.), a weedy, rhizomateous perennial grass introduced in the
United States in relatively recent years, The purpose of this study
was to learn more about its distribution, growth habits,...
1965-05-14 (iso8601)
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Climate change is expected to change the distribution of species. For long-lived, sessile
species such as trees, tracking the warming climate depends on seedling colonization of
newly favorable areas. We compare the distribution of seedlings and...
2015-01-29 (iso8601)
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Environmental change has and will continue to adversely influence aquatic communities. Efforts to model impacts of environmental change on fisheries have largely focused on cold-water, commercial, and recreationally-valued species, even though...
2015-03-01
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Distribution of lichens was studied at seven coastal dune sites in
Oregon. Lichens were sampled in the dry stable, dry meadow,
meadow, rush meadow, marsh, shrub and forest deflation plain communities.
Observations were made of the standing water...
1968-12-10 (iso8601)
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The patterns of uptake, retention, and tissue distribution of
⁹⁵mTc in two freshwater species, the crayfish Pacifastacus
leniusculus and the snail Juga silicula have been investigated. The
animals were chronically exposed in water to which sodium...
1985-05-01 (iso8601)
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Reservoirs can have both positive and negative effects on differing fish species depending on the species concerned and reservoir morphology, flow regime, and basin location. We assessed the influence of limnological zones on the ichthyofauna of...
2016 (iso8601)
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During 1966, 1967, and 1968 extensive field investigations were
carried out in Mount Rainier National Park. These included continuous
research during the summer months, and weekend activities
during the winter months. Small mammals were trapped...
1970-04-16 (iso8601)
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Arthropod communities in pear are conceptualized as hierarchically
organized systems in which several levels of organization or subsystems
can be recognized between the species population level and the community
as a whole. An individual tree is...
1985-01-31 (iso8601)
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Effects of light intensity, exposure to desiccation, reduced
salinity, and thermal elevation on the functional and structural characteristics
of marine benthic diatom communities were investigated
in a laboratory model ecosystem and a respirometer...
1970-08-06 (iso8601)
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In a native prairie of Oregon (363 km²) red-tailed (Buteo jamaicensis), ferruginous (Buteo regalis), and Swainson's hawks (Buteo swainsoni) coexist in one of the highest nesting Buteo densities in North America. In 1979 and 1980, the distribution,...
1981-10-02 (iso8601)
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When adult spawning and juvenile settling locations of marine fishes are
geographically separated, their early life history stages must rely on transport and
their own behavior to move them toward suitable habitats for successful recruitment
to...
2015-10-02 (iso8601)
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Plankton tows from the northern California Current constrain biological and physical
influences on living planktonic foraminifera. In this region, the dominant factors controlling the
size and distribution of symbiotic and asymbiotic species are...
1995-12 (iso8601)
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