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226 - 250 of 1229 Items << < 5 6 7 8 9 10 11 12 13 14 > >>
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ill., maps (1 col.); Typescript (photocopy); Thesis (M.S.)--Oregon State University, 1980; Includes bibliographical references
1979-04-30
2009-06-15 2009-11-02 |
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Canopy gap formation is a major factor contributing to maintenance of overstory species diversity and stand structure in forests and may be integral to development of understory shrub and herb layers as well. Acknowledgement of gap formation as a...
2006-01-30T17:17:09Z (iso8601)
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biologists, microorganisms may be more significant than animals, and the overall structure and complexity of an ecological system are more important than individual species.' Salmon protection can tend to emphasize what Aldo Leopold called "show...
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The cinnabar moth, Tyria jacobaeae (L.) (Lepidoptera:Arctiidae), was
released in 1959 to control the grassland weed tansy ragwort, Senecio jacobaea L.
(Asteraceae), despite evidence that caterpillars of this species can feed on native
plants...
2002-08-22 (iso8601)
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The Center for Pacific Northwest Studies pamphlet collection consists
primarily of published textual documents pertaining to various social,
economic, political, and historical issues in the Northwestern United States
and British...
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The decline of many Pacific salmon stocks has stimulated interest in the early life history and habitat requirements of juvenile salmon. Although estuarine habitat associations of juvenile salmon have been investigated in many coastal areas of the...
2009-01-29T00:05:32Z (iso8601)
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Models relating species distribution records to environmental variables are increasingly
applied to biodiversity conservation. Such techniques could be valuable to predict the
distribution, abundance or habitat requirements of species that are...
2013-03-01 (iso8601)
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Models relating species distribution records to environmental variables are increasingly
applied to biodiversity conservation. Such techniques could be valuable to predict the
distribution, abundance or habitat requirements of species that are...
2013-03-01 (iso8601)
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Riparian zones are critical habitats for management because of their importance
for both cattle production and wildlife, and a high potential for resource conflicts.
Riparian management should address habitat and microhabitat features that sustain...
1996-06-10 (iso8601)
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Species distribution models rely on the assumption that species' distributions are at equilibrium with environmental conditions within a region – i.e. they occur in all suitable habitats. If this assumption holds, species occurrence should be...
2014-01-01
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Viability analysis of well-selected focal species can complement other types of conservation planning by revealing thresholds in habitat area and landscape connectivity that may not be evident from ecosystem-level evaluations. I used focal species...
2000-12-05 (iso8601)
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Species distribution models rely on the assumption that species' distributions are at equilibrium with environmental conditions within a region – i.e. they occur in all suitable habitats. If this assumption holds, species occurrence should be...
2014-01-01
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ill., maps; Typescript (photocopy); Thesis (M.S.)--Oregon State University, 1971; Includes bibliographical references
1971-04-30
2008-09-08 2008-12-01 |
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ill., maps; Shipping list no.: 90-263-P; "May 1990."; Includes bibliographical references
2010-06-05 2010-08-16 |
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A trawling survey was conducted on Nyanza Gulf, Lake
Victoria, East Africa during March-December 1975 to investigate
association and distribution of the major fish species
and to provide information for management of the fishery.
A total of 139...
1978-02-09 (iso8601)
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This study characterizes the production of hypogeous sporocarps (broadly referred to as truffles) by ectomycorrhizal fungi within Douglas-fir dominated forests that are considered typical of those found on the west slopes of the central Cascade...
1988-12-16 (iso8601)
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Thirteen different habitat parameters were measured either quantitatively or
qualitatively around seven different Salix (willow) species on a defined reach of stream
on the southwestern slope of Steens Mountain in southeastern Oregon in order to...
2006-10-13T20:38:22Z (iso8601)
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Twenty-three bottom-trawl fish assemblages were identified from the relative biomass of
33 dominant species that occurred in the National Marine Fisheries Services' triennial
trawl surveys over the continental shelf and upper slope off California,...
1996-04-25 (iso8601)
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One of the goals of ecosystem management is to integrate management of many species and processes across a range of temporal and spatial scales. I investigated the relationship between small mammals and amphibians at 3 spatial scales. My...
1998-08-06 (iso8601)
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The armored dinoflagellates from net hauls taken from ARA/ISLAS ORCADAS cruises 17-78 and 19-79 were studied using light and scanning electron microscopy. The samples were taken at two different seasons, austral spring and fall, on similar cruise...
1985 (iso8601)
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"May 19, 2004"
2004-05-19
2005-07-19 2005-06-30 |
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The spawning habitats of many large marine pelagic predators are poorly known. This lack of knowledge hampers conservation efforts that are aimed at identifying critical habitats for the spawning of these species. We hypothesized that...
2012-08-30 (iso8601)
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The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity and temperature changes.
The study examines...
2007-10-03 2006-01-06 |
