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576 - 600 of 1229 Items << < 19 20 21 22 23 24 25 26 27 28 > >>
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Capelin are a major component of cod diet in many ecosystems of the North Atlantic. In
the Bering Sea, however, the percentage of capelin found in Pacific cod stomachs is negligible. We
hypothesize that the landscape (or ‘seascape’) features of...
2005-04-28 (iso8601)
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Myxobolus cerebralis, a myxozoan parasite that infects almost all species of wild
and cultured salmonids, was first identified in northeastern Oregon in the Lostine River in
1986. Fish that are heavily infected with M. cerebralis develop whirling...
2000-06-16 (iso8601)
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Stratified bongo net samples taken at depths between 0 and 500 m at Ocean Station “P” in the subarctic Pacific in early July 1971 have been analyzed to determine the vertical structure of the zooplankton community. Distributions for 99 categories...
1975-09 (iso8601)
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ill.; Three folded plates in pocket; Thesis (M.S.)--University of Minnesota, 1961; Bibliography: leaves 168-175
1961-09-21
2008-07-02 2008-08-29 |
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1 map : col. ; 46 x 42 cm. Relief shown by contours. Contour interval 500 feet. Shows extent of five timber species. "Julius Bien & Co. Lith. N.Y." Scale ca. 1:380,000 (W 122°00--W 120°00/N 49°00--N 47°30)
1898-09-21
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Little is known about upland agricultural grassland soil invertebrate composition and its contribution to ecosystem functioning. Soil-dwelling organisms play a central role in soil formation, plant nutrition, and are significant food contributors...
2004-05-26 (iso8601)
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The benthic microalgae of sediments of the two tidal flats in
Yaquina Bay, Oregon were investigated to determine the environmental
factors limiting the abundance and the horizontal and vertical distribution
of these organisms. The Southbeach tidal...
1969-05-09 (iso8601)
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Pollination is a critical ecosystem function for sustaining biodiversity. However, pollinators and the services they provide are threatened by landscape-altering anthropogenic activities across the globe. Habitat loss and fragmentation,...
2014-11-25 (iso8601)
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Organic matter dynamics in riparian ecosystems are largely driven by interactions
among hydrology, soil, and vegetation. In two riparian meadows, northeast Oregon, I
examined the hypothesis that vegetation and soil characteristics in three plant...
2001-05-07 (iso8601)
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Microseris laciniata is a perennial, self-incompatible
species classified in subgenus Scorzonella. It is
morphologically the least specialized species in the genus,
in contrast to the members of subgenus Microseris, which
are morphologically...
1980-04-03 (iso8601)
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Literature and museum records have been reviewed to
provide a summary on the distribution, habitat
associations and biology of six western North American
Dicosmoecinae genera and the single eastern North
American genus, Ironoquia. Results of this...
1987-08-06 (iso8601)
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Distribution of nests and nesting success were determined for
sharp-shinned hawks (Accipiter striatus) Cooper’s hawks (A. cooperii),
and goshawks (A. gentilis) in Oregon during 1969 through 1974. 1n
addition, two areas (11,74l hectares in Eastern...
1974-12-19 (iso8601)
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EXECUTIVE SUMMARY
An increase in the commercial and recreational harvest of clams in Tillamook Bay, Oregon, coupled with a general lack of knowledge about the bay's ecology, served as the impetus for a shellfish survey undertaken in the summer of...
1995-11-00 (iso8601)
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The endemic avifauna of Guam and the Mariana Islands represent a unique
assemblage of bird species found nowhere else in the world and thus, are of
considerable biological and conservation importance. Unfortunately, most of these
species are...
2003-03-18 (iso8601)
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Short-tailed albatrosses (Phoebastria albatrus, hereafter "STAL") migrate throughout the North Pacific, overlapping with multiple large scale fisheries. In the Bering Sea, documented bycatch of this species is a focal conservation concern, due to...
2013-07-31 (iso8601)
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Pollination is a critical ecosystem function for sustaining biodiversity. However, pollinators and the services they provide are threatened by landscape-altering anthropogenic activities across the globe. Habitat loss and fragmentation,...
2014-11-25 (iso8601)
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Crater Lake, originally barren of fish, was stocked on an
irregular basis from 1888 through 1941 with several species of
salmonids. Two species occur in the lake today--kokanee salmon
(Oncorhynchus nerka) and rainbow trout (Salmo gairdneri). This...
1988-05-23 (iso8601)
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I examined the relative roles of biotic and abiotic factors in structuring redband trout
Oncorhynchus mykiss distributions in the South Fork John Day. I first examined the
relationship between the biological traits of the fish assemblage and...
2008-10-13T17:03:35Z (iso8601)
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Five sympatric species of desert lizards (leopard lizards (Garnbelia wizlizeni), sagebrush lizards (Sceloporus graciosus), side-blotched. lizards (Uta stansburiana), desert horned lizards
(Phrynosoma platyrhinos), and Western whiptails...
1980-07-24 (iso8601)
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Despite the belief that fuels management, a form of prescribed fire that reduces
accumulated fuels in commercially thinned forests, is necessary to restore forest 'health'
in the Pacific Northwest, its effects on wildlife has received little...
2002-09-13 (iso8601)
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In 1935 construction was completed on the Bureau of Reclamation's Hoover Dam, located near the bend of the historic Colorado River. Rising 726 feet within the rugged walls of Black Canyon, the structure is still recognized today as the highest...
1977-03-01
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In 1935 construction was completed on the Bureau of Reclamation's Hoover Dam, located near the bend of the historic Colorado River. Rising 726 feet within the rugged walls of Black Canyon, the structure is still recognized today as the highest...
1977-03-01
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Douglas-fir (Pseudotsuga menziesii) has a wide distribution in North America and is one of the
tree species most widely distributed outside its natural range. The species has been introduced to
Europe, New Zealand, South America, and elsewhere...
2014 (iso8601)
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Zooplankton of the littoral and limnetic zones of Bear Lake, Idaho-Utah, were collected over a 17-month period. Twenty-three species of zooplankton were recorded, as well as nine other species represented by both flora and fauna. At the time of...
1967-05-01
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In most areas, estimating the presence and distribution of cryptic marine mammal species, such as beaked whales, is
extremely difficult using traditional observational techniques such as ship-based visual line transect surveys. Because
acoustic...
2012-05-18 (iso8601)
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