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451 - 475 of 1229 Items << < 14 15 16 17 18 19 20 21 22 23 > >>
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An aging electricity distribution system and reduced availability of naturally durable tropical hardwoods in Australia will
combine in the next decade to produce a major shortage of poles. One approach to mitigating this shortage is to utilize...
2009-09 (iso8601)
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Sharp-shinned Hawks (Accipiter striatus), and Cooper's Hawks (A.
coo erii) in the conifer forests in northwestern Oregon and A.
striatus, A. cooperii, and Goshawks (A. gentilis) in the conifer
forests of eastern Oregon were syntopic during the...
1978-07-06 (iso8601)
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Relatively recent increases in ponderosa pine abundance have effected
unprecedented changes to ecosystem structure and function. Efforts to restore
ponderosa pine systems are often focused on the manipulation of tree structure and
the...
2007-10-16 (iso8601)
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We conducted capture and acoustic surveys for bats in six areas along a latitudinal gradient in Southeast Alaska from mid-May to September in 2005 and we continued surveys on Prince of Wales Island from mid-May to September in 2006. We determined...
2007-09-10T21:57:18Z (iso8601)
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This report documents statistical procedures for using species abundance distributions for monitoring pollution impacts in aquatic biological communities. The species abundance distributions are also appropriate for use in other areas of applied...
1982-12-01
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The influence of the physical environment on organisms has long been a subject of ecological research. But, the complex drivers of environmental variation, and the multiple scales at which this can occur, make studying this topic a difficult...
2014-01-17 (iso8601)
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We present genetic and morphological evidence supporting the recognition of a
previously synonymized species of Mesoplodon beaked whale in the tropical Indo-Pacific,
Mesoplodon hotaula. Although the new species is closely-related to the rare...
2014-07 (iso8601)
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Isolated populations of four reindeer lichen species and varieties co-occur in a unique relict prairie habitat at Mima Mounds Natural Area Preserve, southwest Washington State, USA. The prairie is the type locality for mima mounds, unusual...
2011-11-23 (iso8601)
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An ecological study of small forest mammals was conducted
from 1964 to 1970. The objectives were to obtain chronological information
relative to the effects of current logging practices on vegetational
succession and small mammal populations.
The...
1971-05-10 (iso8601)
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Riparian communities dominated by members of the
Salicaceae (Salix lasiandra, S. lutea, S. lemmonii,
Populus trichocarpa, P. tremuloides and S. exiqua) were
studied at the Crooked River National Grassland in central
Oregon. The objectives of this...
1988-12-20 (iso8601)
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A 50 m² pelagic trawl equipped with a codend opening-closing device was used to sample micronektonic fishes between 500 m and 1000 m. Horizontal tows were made at 500, 650, 800 and 1000 m. Twelve of 15 common species captured showed significant...
1979-10-29 (iso8601)
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"December 10, 1998."
1998-09-21
2005-04-10 2005-04-01 |
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The purpose of this study was to determine the present status
of introduced parasites of the omnivorous leaf tier, Cnephasia
longana (Haworth) in Oregon.
The omnivorous leaf tier is native to Europe. It was introduced
into North America around...
1968-07-17 (iso8601)
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The Northern California Current (NCC) ecosystem exhibits extreme seasonal, interannual and interdecadal shifts in the abiotic environment and shifts in primary and higher production. This variability is also apparent in the spatial structure of...
2006-07-24T16:18:19Z (iso8601)
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A study was undertaken in the Marys Peak watershed with the
following objectives. First, a classification of the major plant communities
was carried out. Second, some of the ecological features
of Acer circinatum that account for its distribution...
1967-03-31 (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...
2011-03-01
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Correspondence,
subject files, clippings, legislation files, reports, newsletters, meeting
minutes, legal case files, and other records of the Washington Environmental
Council, which works to protect and restore the environment in...
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Stomata control tree transpiration by sensing and integrating environmental signals originating in the atmosphere and soil, and co-occurring species may differ in inherent stomatal sensitivity to these above- and belowground signals and in the...
2013-03-19 (iso8601)
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Seven species of water-dependent birds (northern phalarope,
Phalaropus lobatus; American avocet, Recurvirostra americana; Wilson's
phalarope, P. tricolor; eared grebe, Podiceps nigricollis;
ring-billed gull Larus delawarensis; California gull, L....
1986-10-31 (iso8601)
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Vegetation structure quantified by light detection and ranging (LiDAR) can improve
understanding of wildlife occupancy and species-richness patterns. However, there is
often a time lag between the collection of LiDAR data and wildlife data. We...
2014-03-07 (iso8601)
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A major goal of conservation biology is to elucidate the population genetic
structure in threatened species and assess the relative importance of the
evolutionary forces that shape that population genetic structure. I conducted three
studies in...
2002-10-25 (iso8601)
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