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326 - 350 of 1229 Items << < 9 10 11 12 13 14 15 16 17 18 > >>
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Abstract
The utility of using isozyme analysis to study the stock structure among West Coast populations of green sturgeon (Acipenser medirostris) was assessed. Isozyme analysis was not determined to be an adequate method for assessing stock...
2000-06-01
2005-07-19 2005-05-23 |
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The nomenclatural history of Gomphus sensu lato began with Persoon in
1797. Over 200 years species of Gomphus sensu lato have been variously classified
also under Cantharellus, Craterellus, Chloroneuron, Chlorophyllum,
Gloeocantharellus,...
2004-05-05 (iso8601)
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Wetlands are important ecosystems that improve water quality, prevent floods, and provide wildlife habitat. As such, restoring native plants that promote wetland health is a high priority for land managers. However, there are many challenges to...
2022-08-01
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Although field-collected recordings typically contain multiple simultaneously vocalizing birds of different species, acoustic species classification in this setting has received little study so far. This work formulates the problem of classifying...
2012-06 (iso8601)
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Soil moisture depletion trends under five plant species growing
on the clear-cuts of the Marys Peak Watershed near Corvallis,
Oregon, were followed during the summers of 1963 and 1964. The
species were Holcus lanatus, Lotus crassifolius var....
1968-04-10 (iso8601)
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This thesis research consists of an investigation of the human
influences on wildlife in Belize. The study was accomplished by the
collection and analysis of data with respect to land use, habitat
characteristics, and wildlife status in Belize....
1974-04-18 (iso8601)
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Areas with high species richness have become focal points in the establishment of
marine protected areas, but an understanding of the factors that support this diversity is still
incomplete. In coastal areas, tidal currents—modulated by bathymetry...
2013-07-30 (iso8601)
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To date, the use of oceanographic data in fisheries management has been limited by
the scarcity and the difficulty of accessing complete oceanographic datasets.
Consequently, fish stocks are managed with limited knowledge about the habitat where...
2006-03-15 (iso8601)
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The purpose of this study was to develop a plant
association classification for the mature coniferous
forests of the McDonald and Paul M. Dunn Research Forests.
A secondary objective was to quantify diversity within the
plant associations. This...
1991-04-15 (iso8601)
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Predators exert a strong selective force on the ecosystems in which they exist, thereby altering the structure of ecological communities and leading to the evolution of prey defences. However, how interspecific differences in defence ability...
2015-09-30
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I examined ecological relationships and mechanisms of coexistence for
sympatric populations of Columbian white-tailed (Odocoileus virginianus leucurus)
and black-tailed deer (Odocoileus hemionus columbianus) in Douglas County,
Oregon, from...
2001-06-29 (iso8601)
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Western Atlantic synodontid species were studied as part of an ongoing effort to reanalyze Caribbean shorefish diversity. A neighbor-joining tree constructed from cytochrome c oxidase I (COI) data revealed 2 highly divergent genetic lineages...
2013-03-28 (iso8601)
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From May through November 1963, a mosquito survey was
made in the city of Corvallis, Oregon. The information
obtained dealt with the species of mosquitoes found,
their seasonal occurrence and the location and nature of
their larval habitats. A...
1964-05-04 (iso8601)
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This study was undertaken to find means of separating the
morphologically similar species of North American Trixagus and to
bring together information on Trixagus and Pactopus.
A key to separate the world's eight genera of extant Throscidae
is...
1970-09-09 (iso8601)
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The marine climate of the Galapagos is spatially and seasonally
heterogeneous. A taxonomically comprehensive study of Galapagos zooplankton has
never been done. This study is an initial effort to establish the distribution and
community structure...
2009-12-10 (iso8601)
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This paper lists, and gives individual accounts of, those Oregon mammals that at some time have been referred to as being of a status other than common. Although rare and endangered wildlife species were listed on a national level in the United...
1972-04-28 (iso8601)
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Benthic fauna in Mamala Bay was sampled on 8-17 August 2001 at 22 stations with a modified van Veen grab sampler and at 18 stations with diver-operated sediment corers. Station locations were selected according to a random probabilistic sampling...
2009-02-18
2009-02-18 2002-03-01 |
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This study was initiated to determine the relative efficiency
of systematic, stratified and simple random sampling for crown area
and tree frequency estimation of five of the major forest types found
in the Pacific Northwest. Several of the more...
1967-10-26 (iso8601)
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Benthic fauna in Mamala Bay was sampled on 6-14 August 2003 at 10 stations with a modified van Veen grab sampler and at
30 stations with diver-operated sediment corers. Station locations were selected according to a random probabilistic sampling...
2009-02-18
2009-02-18 2004-03-01 |
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Fusarium crown rot (FCR) is one of the most widespread root and
crown diseases of wheat in the Pacific Northwest (PNW) of the United
States. Our objectives were to characterize crown rot severity and
distribution throughout the PNW by conducting a...
2013-11 (iso8601)
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The present study was conducted as a three part investigation to
(i) examine the incidence, distribution and kinds of standard plate
count bacteria present in chlorinated and raw water; (ii) study the
ecological role and possible health...
1980-09-26 (iso8601)
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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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