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201 - 225 of 1229 Items << < 4 5 6 7 8 9 10 11 12 13 > >>
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Nonindigenous species are a major threat to the ecological integrity and biodiversity of marine and estuarine ecosystems. To become a successful invader, species must pass through four phases: (1) survive transport, (2) survive release, (3)...
2010-02-10 (iso8601)
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"January 2001."
2024-05-01
2004-01-05 2004-12-16 |
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In the fall through spring of 2002/03 and 2003/04, the composition of
fish and amphibian communities were examined in intermittent streams in
the upper Willamette river basin in western Oregon. I recorded standard
aquatic habitat variables and...
2005-05-04 (iso8601)
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Ecological relationships between D. coccinellae and its coccinellid hosts were examined in the Willamette Valley, Oregon, in 1982. The distribution and relative abundance of seven species of coccinellids from eight collecting sites were monitored...
1988-12-16 (iso8601)
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In the tropics, widespread deforestation and conversion of primary forests to
agricultural and pasture lands has resulted in losses of composition, structure, and functions
of forest landscapes. Deforestation in the tropics is typically preformed...
2001-05-02 (iso8601)
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If the success of the Endangered Species Act (ESA) is measured by the number of endangered species that have been recovered and delisted, then the act is not very successful. Only 15 species have been delisted because of recovery in the history of...
2005-06 (iso8601)
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A study to review the status and distribution of vascular plants at Lewis and Clark National Historical Park was initiated in 2009 and completed in 2010 by the Oregon Natural Heritage Information Center at Oregon State University. This study built...
2012-07 (iso8601)
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This thesis explored the distributions and life histories of dragonflies and
damselflies (Insecta: Odonata) of the riverine wetlands of the Willamette Valley
in western Oregon, USA. Odonate species distributions were characterized over
two seasons...
2002-08-19 (iso8601)
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The several thousand fungi known to form ectomycorrhizae have co-evolved with their host plants and have developed impressive physiological and ecological diversity. Exploration of some relationships of enzyme activities and phytohormone...
1984-09-28 (iso8601)
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In recent years, studies dealing with temperature regulation,
temperature sensitivity, and physiological responses to temperature
in lizards and other reptiles have increased tremendously. It is
notable that snakes have been largely ignored in...
1963-12-16 (iso8601)
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Geographic range size is often conceptualized as a fixed attribute of a species and treated as such for the purposes of quantification of extinction risk; species occupying smaller geographic ranges are assumed to have a higher risk of extinction,...
2015-01-09
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The avifaunal composition of ten western Oregon forest stands
located at the eastern base of the Coast Range was examined on a seasonal
basis. The stands were dominated by Oregon white oak, Douglas
fir or western hemlock, Avian populations were...
1970-04-29 (iso8601)
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The federally threatened northern spotted owl (Strix occidentalis caurina) is the focus of intensive
conservation efforts that have led to much forested land being reserved as habitat for the owl and associated wildlife
species throughout the...
2014-02-24 (iso8601)
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In addition to its longstanding recognition as an influential evolutionary process,
interspecific hybridization is increasingly regarded as a potential threat to the genetic integrity and survival of rare plant species, manifested through gamete...
2003-05-23 (iso8601)
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Groundfish surveys off Oregon were conducted over a four year period (1971-74)
between the Columbia River and Cape Blanco. Primary purpose of the surveys was to obtain estimates of biomass of important groundfish occupying the continental shelf...
1976-06 (iso8601)
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The 36 samples collected with a 22-foot semi-balloon shrimp
trawl at depths from 40 to 1,829 meters off the central coast of
Oregon between July 1961 and June 1962 provided preliminary data
on the distribution, species composition, and...
1967-07-07 (iso8601)
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The forest alpine tundra ecotone (FTE, also known as alpine treeline or subalpine parkland), is a conspicuous feature of mountain landscapes throughout the world. Climate change-driven increases in temperature are believed to result in FTE...
2010-03-09 (iso8601)
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Montane meadows in the western Cascades of Oregon occupy approximately 5% of the landscape, but contribute greatly to the region's biodiversity. Western Cascades meadows are dynamic parts of the landscape and have contracted by over 50% in the...
2011-05-05 (iso8601)
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Papers of a
professor of zoology at University of Washington and oysterman; Trevor Kincaid was Professor of Zoology at the University of
Washington from 1901-1947. Although primarily involved with entomological
efforts, he became...
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The temperature of streams and rivers is changing rapidly in response to a variety of human activities. This rapid change is concerning because the abundances and distributions of many aquatic species in streams and rivers are strongly associated...
2022-05-01
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Executive Summary This report provides information describing the biological, hydrological, meteorological, and water quality conditions associated with the die-off of an estimated 34,056 fish in the Klamath River, California in September 2002....
2024-05-01
2005-02-08 2004-12-22 |
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The federally threatened northern spotted owl (Strix occidentalis caurina) is the focus of intensive conservation efforts that have led to much forested land being reserved as habitat for the owl and associated wildlife species throughout the...
2012-03-02 (iso8601)
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Rhizopogon is a large genus of ectomycorrhizal (EM) fungi that grows in association with host trees of the family Pinaceae. We have conducted a series of studies investigating the ecology and evolutionary biology of the EM symbiosis shared between...
2015-03-13 (iso8601)
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The genus Deraeocoris Kirschbaum of western America north of
Mexico was revised. Approximately 10,000 specimens from the Nearctic
Region were examined. Taxonomic characters used by previous authors
were reevaluated. In addition to the male...
1980-08-21 (iso8601)
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ill., maps (1 col.); Typescript (photocopy); Thesis (M.S.)--Oregon State University, 1980; Includes bibliographical references
1979-05-01
2009-06-15 2009-11-02 |
