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851 - 875 of 1229 Items << < 30 31 32 33 34 35 36 37 38 39 > >>
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While current theories describing the insect-plant interaction
have emphasized the biochemical aspects of the relationship,
morphological components can also play a significant role in
determining which plants or tissues are susceptible to insect...
1983-03-04 (iso8601)
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A study was conducted to determine the quantity and distribution
of bark debris resulting from log rafting. Three distinct problems were
studied: (I) the quantity of bark dislodged from the logs while being
placed in the rivers and during...
1969-11-03 (iso8601)
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The estuarine-dependent brown shrimp, Farfantepenaeus aztecus, is a significant commercial fishery and important species in the Gulf of Mexico (GOM) ecosystem as well as being a key component in energy transfer between benthic and pelagic food web...
2016-05 (iso8601)
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Diel changes in discharge caused by hydroelectric peaking directly affect water levels and velocities and indirectly alter benthos and fish abundance and distribution. The effect of discharge on aquatic insect population below Dworshak Dam on the...
1976-09-01
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Marine prey often occur in hierarchical mosaics whereby small, high-density patches
are nested inside of larger, lower density aggregations. We tested the extent to which the foraging
behavior of a marine predator (northern fur seal Callorhinus...
2013-04-08 (iso8601)
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One chapter of a seven chapter annual report from 1999 examining ecological issues regarding the shortnose and Lost River sucker populations in Upper Klamath Lake and Williamson River.
2024-09-21
2005-09-11 2005-01-20 |
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The occurrence and distribution of fish viruses in Oregon were
determined by the examination of anadromous and fresh water salmonids.
Infectious pancreatic necrosis virus (IPNV) was isolated and
identified from asymptomatic adult coho...
1975-09-22 (iso8601)
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Water scarcity in semiarid environments provides a model system to evaluate the role of mesic resources in structuring the distribution and abundance of wildlife. We used remote sensing and point process analyses to evaluate spatio–temporal...
2016-01 (iso8601)
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At the Siuslaw Estuary or some adjacent areas, U. S. Fish and Wildlife Service (USFWS) Biologists John Annear, John Cornely, and Roy Lowe conducted 67 censuses; Maureen Woolington made 90 censuses, and Range Bayer completed 429 censuses....
1988 (iso8601)
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Coho salmon (Oncorhynchus kisutch) migration and spawning are unique
components of the salmon life cycle because they require synchrony of behavior with
other individuals as well as with acceptable fluvial conditions. As with other organisms
that...
2013-05-08 (iso8601)
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Effective and sustainable fisheries management not only depends on identifying and defining stocks (fundamental unit of management), but also on having knowledge of factors influencing the abundance, distribution and connectivity of stocks....
2011-07-14 (iso8601)
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Correspondence, speeches, press releases, bills, reports, case files, subject files, campaign material, photos, and other papers, from Jordan's service as a U.S. Senator from Idaho. Includes material relating to Bonneville Power Administration,...
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To measure organismal coherence in a pelagic ecosystem, we used moored sensors to describe the vertical dynamics of
each step in the food chain in shelf waters off the west shore of Oahu, Hawaii. Horizontally extensive, intense aggregations
of...
2014-05-20 (iso8601)
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Small temporal and spatial variations in the distribution of dissolved oxygen in Crater Lake, Oregon, are
used to estimate the mean age of the lake’s deep water, the flux of labile organic carbon to the deep lake, and the influence of hydrothermal...
1996 (iso8601)
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ill., 1 map (sketched) ; Report title; "Drought conditions are continuing in 1994, at the writing of this report in March of 1994, Crater Lake National Park had received approximately 50% of the annual average accumulated precipatation to date." -...
2008-12-23 2009-02-09 |
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The goal of Advanced Fuel Cycle Initiative program is to efficiently separate and recover actinides in attempts to reprocess irradiated nuclear fuel and reduce the necessary storage volume. In order to facilitate large-scale industrial...
2010-05-06T20:48:42Z (iso8601)
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This study describes the soils, vegetation and age structure
of the Pinus contorta forests of Crater Lake National Park. Growth
rates of P. contorta, and levels of infection and impact of dwarf
mistletoe (Arceuthobium americanu1r) on growth of P....
1977-11-23 (iso8601)
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Efficient usage of resin is of critical importance to industry in the manufacture of wood composite panels, because resin represents a significant proportion of product costs. However, resin efficiency is poorly defined in literature, making it...
2014-02-27 (iso8601)
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Mathematical modeling of phytoplankton populations based on laboratory observations provides increased understanding of the interaction among the environmental and biological mechanisms. influencing growth dynamics. Such fundamental understanding...
1972-01-03 (iso8601)
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The objective of this study was to examine the life history of
vine maple on the H. J. Andrews Experimental Forest. This study was
conducted as a part of an I. B. P. general study of understory biomass
and productivity. The specific objectives...
1973-12-18 (iso8601)
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Understanding the factors that drive spatial patterns in stream ecosystem processes and the distribution of aquatic biota is important to effective management of these systems and the conservation of biota at the network scale. In this study, we...
2019-06-24
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This research focused on features of a genetically
isolated population of cutthroat trout (Oncorhynchus clarki)
in the Triangle Lake basin of coastal Oregon. A falls at
the outlet of Triangle Lake has blocked upstream migration
of trout and...
1993-06-22 (iso8601)
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Stream systems in the Pacific Northwest have come to be understood in the absence of beaver (Castor canadensis). To understand the effect of beaver upon riparian plant communities, four basins in the lower Alsea drainage were examined to determine...
2000-12-11 (iso8601)
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The shake and wash technique (samples placed in a jar with alcohol added and
shaken to remove the mites) was effective in removing 100% of the predator mites, and adult
spruce spider mites from Douglas-fir foliage and 98% of the spruce spider mite...
1991-02-20 (iso8601)
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Atmospheric pressure changes do not stop at the permeable snow surface but rather propagate into it. These pressure changes range from high-amplitude, low-frequency events caused by seasonal cycles and synoptic weather systems to small-amplitude,...
2016-04-29 (iso8601)
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