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301 - 325 of 1229 Items << < 8 9 10 11 12 13 14 15 16 17 > >>
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Seascape ecology is an emerging discipline focused on understanding how features of the marine habitat influence the
spatial distribution of marine species. However, there is still a gap in the development of concepts and techniques for its...
2014-10-27 (iso8601)
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Riparian ecosystems support mosaics of terrestrial and aquatic plant species that enhance regional biodiversity and provide important ecosystem services to humans. Species composition and the distribution of functional traits - traits that define...
2013-08-26 (iso8601)
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The objectives undertaken in this study were:
1) to develop means of identifying the immature stages of
the known insect predators and parasites of the Douglas-fir beetle; 2) to investigate the possible distribution,
spatially and/or temporal, of...
1963-02-01 (iso8601)
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The term Citizen Science refers to scientific research in which volunteers from the community participate in scientific studies as field assistants. Since citizen scientists can collect data cheaply, they enable research to be performed at much...
2010-10-11T00:23:30Z (iso8601)
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North American sagebrush (Artemisia spp.) ecosystems are suffering from
reductions in habitat extent and quality. Only about 50% of sagebrush remains
from pre-settlement conditions, and much of the remaining habitat is
fragmented or degraded by...
2006-03-28T16:26:06Z (iso8601)
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Monitoring of Lost River and Shortnose Suckers at Shoreline
Spawning Areas in Upper Klamath Lake, 1999
Prepared by:
Rip S. Shively1
Mark F. Bautista2
Andre E. Kohler2
1 U. S. Geological Survey, Biological Resources Division
Klamath Falls Duty...
1999-05-21
2005-05-06 2005-04-01 |
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Available information on aquatic biota of the Willamette Basin was reviewed and summarized to describe current and historical conditions as part of the U.S. Geological Survey's National Water- Quality Assessment Program. Biological parameters...
1997-05-21
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Mitigating for increased human impact to the seafloor associated with resource extraction activities and renewable energy development can benefit from an understanding of the distribution of sensitive marine benthic species. Habitat suitability...
2015-05-13 (iso8601)
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To determine which isolates will most rapidly replace
Phellinus weirii in stumps and roots, Trichoderma spp. were
isolated from P. weirii-infested stumps and roots, identified, and
examined for growth rates and lethal effects on P. weirii in...
1986-04-22 (iso8601)
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Natural and anthropogenic site characteristics play a role in determining the current distribution of invasive plant species. An understanding of these characteristics can be used to prioritize areas for monitoring and control efforts and to...
2013-07-01
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The bark beetle Dendroctonus ponderosae Hopkins (Coleoptera:
Scolytidae) has caused severe mortality in recent decades to young
stands of ponderosa pine in the western United States. Insect parasites
and predators, believed to be of importance in...
1970-04-10 (iso8601)
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The vegetation of the Oregon coast is characterized by a
variety of stages of plant succession which are repeated widely
throughout the sand dune area. During the years from 1960 to 1963
the gradation of upland sand dune succession was studied on...
1963-05-14 (iso8601)
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This study evaluates the functional organization of stream fish assemblages in response to streamflow factors and biotic interactions across a range of spatial scale. The study area for this project includes 109 stream reaches located on...
2008-11-06 (iso8601)
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Availability of Bonneville cutthroat trout (BCT - Oncorhynchus clarki Utah) habitat continues to decline in the Great Basin due to a lack of stream connectivity, over allocation of water resources, and detrimental land use practices. The Logan...
2011-01-01
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The rocky intertidal is a diverse ecosystem with a variety of species and ecological
interactions. Many biotic and abiotic interactions act together to restrict the abundance
and distribution of species. Anthropogenic effects can have an important...
2008-06-19T16:05:52Z (iso8601)
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The introduction of non-native species often results in fundamental changes in the structure and function of disturbed environments. In the Pacific Northwest (PNW), the introduced seagrass Zostera japonica is rapidly expanding in distribution,...
2015-05-22 (iso8601)
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Natural and anthropogenic site characteristics play a role in determining the current distribution of invasive plant species. An understanding of these characteristics can be used to prioritize areas for monitoring and control efforts and to...
2013-07-01
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The objectives of this study were to (1) describe
physical environmental conditions and species composition
at several sites along an Upstream/downstream gradient in a
number of tributaries of the Willamette River in western
Oregon; and (2)...
1988-11-29 (iso8601)
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The Mimulus washingtonensis complex is a group of morphologically similar
species centered in the Pacific Northwest. All are rare, and most are under
consideration for listing as endangered. Morphometric and pollination data were
used in...
1992-05-08 (iso8601)
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Six 3 to 4 weeks old, cesarian-derived lambs were inoculated with ovine an
adenovirus isolate 475N. Inoculated lambs showed moderate clinical signs of respiratory
distress, conjunctivitis, and loose feces during the 10-day observation period....
1995-09-08 (iso8601)
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Organismal tolerance to abiotic environmental stresses contributes significantly to setting the distribution limits of organisms, as demonstrated by vertical zonation patterns in the marine intertidal zone. In this thesis, the ultimate...
1998-12-04 (iso8601)
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Western juniper has increased in density and distribution in the interior Pacific Northwest since the late 1800s. Management
goals for many juniper woodlands are now focused on reducing tree densities and promoting biodiversity, prompting the use...
2014-11 (iso8601)
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CRS issue brief; "Updated May 19, 2005."
2005-05-19
2005-07-22 2005-06-27 |
