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926 - 950 of 1229 Items << < 33 34 35 36 37 38 39 40 41 42 > >>
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The search for the stand density that optimizes growth and hence generates the maximum amount of wood is one of the philosopher’s stone in modern forestry. Since scientific methods were applied to forestry, numerous generations of foresters have...
2014-09-19 (iso8601)
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Depletion-Based Stock Reduction Analysis (DB-SRA; Dick and MacCall, 2011) is a catch-only fisheries stock assessment model that has been developed to estimate an overfishing limit (OFL) in data-poor situations. DB-SRA projects the biomass...
2014-09-02 (iso8601)
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Snowbrush (Ceanothus velutinus), red alder (Alnus rubra), and
bitterbrush (Purshia tridentata) are three important nitrogen- fixing
nonleguminous species. They commonly grow in association with
commercially important conifers in western United...
1967-06-26 (iso8601)
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Hatcheries whose purpose is to provide for a recreational fishery must minimize impacts on wild fishes. Management to reduce hatchery and wild interactions is especially important on river systems that contain Endangered Species Act (ESA) listed...
2009-03-30 (iso8601)
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Many highly exploited ecosystems are managed on the basis of single-species demographic information. This management approach can exacerbate tensions among stakeholders with competing interests who in turn rely on data with notoriously high...
2012-04 (iso8601)
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Early life stages of many marine and diadromous fish species use sandy beach surf zones, which occur along >50% of the world's marine coastlines. This extensive habitat can provide juvenile fishes with an abundant supply of potential prey and the...
2012-10-05 (iso8601)
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Section 8B, Item 3
Point out that the Lower Snake River Compensation Plan considers artificial propagation of trout in lieu of smallmouth bass losses. Reservoir habitats, with or without water level fluctuations, replace former smallmouth...
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Two Oregon reservoirs contaminated by different mercury
sources were compared for mercury distribution in sediment and
bioaccumulation by fish. The average mercury concentration in
the sediment of Cottage Grove reservoir (0.67 ± 0.05 μg/g dry
wt)...
1996-03-07 (iso8601)
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The problem addressed is absence of a class of objects in a finite set of objects, which
is investigated by considering absence of a species and absence in relation to a threshold.
Regarding absence of a species, we demonstrate that the assessed...
1997-11-25 (iso8601)
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A diverse assemblage of infaunal polychaetes and invertebrates was collected in three replicate sand samples from three locations off Grey’s Beach, Waikīkī, O’ahu, Hawai’i. Infauna were extracted over 0.5 mm and 0.25 mm sieves. Specimens from the...
2012-03-15
2012-03-15 2008-08-01 |
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More than 200 sites between 500 and 2000 meters elevation
were examined utilizing a reconnaissance sampling technique for a
portion of the eastern slopes of the northern Oregon Cascade Mountains.
Twelve different forested plant communities were...
1978-05-18 (iso8601)
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Juga silicula (Gould) is an omnivorous pleurocerid snail that inhabits many streams in NW USA. In some streams it comprises over 90% of invertebrate standing crop bio-mass. Analysis of benthic samples from 20 stream reaches showed that densities...
1987-01-01
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Western juniper (Jun iperus occidentalis Hook) is a species of juniper native to arid regions of the Pacific Northwest. The western juniper tree has a number of competitive strategies that, in conjunction with an almost complete removal of fire...
2002-06-13 (iso8601)
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Concurrent measurements of predator and prey δ¹⁵N isotope values demonstrated that a cross-shelf
isotopic gradient can propagate through a marine food web from forage species to top-tier predators and
indicate foraging areas at a scale of tens of...
2014-11 (iso8601)
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Fish are one of the most imperiled groups of vertebrates worldwide. Threats to fish fall into one of four general categories: physical habitat loss or degradation, chemical pollution, overfishing, and nonnative species introductions. Nonnative...
2009-05-01
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Bycatch, or the incidental capture of non-target species, has been implicated as one of the main factors leading to population declines of many large marine vertebrates, including sea turtles. To effectively manage and conserve these long-lived...
2011-06-16 (iso8601)
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This study¹ was undertaken: (1) to obtain information on the distribution of the snail, Oxytrema silicula, in three coastal rivers in Oregon, and the seasonal incidence of infection in these snails and in snails from an inland stream, with the...
1966-03-02 (iso8601)
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Herein, we posit a link between the ecological extinction of wolves in the American West
and the expansion in distribution, increased abundance, and inflated ecological influence
of coyotes. We investigate the hypothesis that the release of this...
2013-04 (iso8601)
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The Northwest Forest Plan (NWFP), which aims to conserve late-successional and old-growth forests
(older forests) and associated species, established new policies on federal lands in the Pacific Northwest
USA. As part of monitoring for the NWFP,...
2011-11-01 (iso8601)
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Citizen science work has built the foundation of much of our knowledge on regional-scale large cetacean spatial patterns through historical whaling data. Historical whaling data on sperm whales was used as an example to show the type of ecological...
2015-11-20 (iso8601)
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