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251 - 275 of 1229 Items << < 6 7 8 9 10 11 12 13 14 15 > >>
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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 |
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Regions of similar species composition and groups of demersal fish
species with similar distribution patterns from Cape Flattery,
Washington to Point Hueneme from 50-250 fm (93-460 rn) were defined based
on results of an agglomerative cluster...
1982-06-14 (iso8601)
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The overall goal of this study was to identify multiple scales of habitat use and habitat electivity by redband/steelhead trout and define the limiting factors affecting the distribution patterns of this species during summer flows.
The main...
2008-04-23T20:44:58Z (iso8601)
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The gonadal steroids, testosterone and estradiol, are known to be important
modulators of neuronal functions and behaviors in most vertebrate species. These
steroid hormones also elicit changes in neuropeptide synthesis and secretion, alter...
1994-12-07 (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.
2024-05-21
2005-09-11 2005-01-20 |
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Species distribution models (SDMs) are increasingly applied in conservation management
to predict suitable habitat for poorly known populations. High predictive performance of
SDMs is evident in validations performed within the model calibration...
2015-03-06 (iso8601)
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From the 1920's through 1951 several severe fires occurred in the predominantly conifer forest ecosystems of the northern Oregon Coast Range. Of the 211,151 ha. of mapped area, 57 percent was burned. The effects of frequent fires with high...
1997-07-11 (iso8601)
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Increasingly diverse interests in commercial and recreational use of marine resources are creating new challenges for coastal ocean management. One concern of increased offshore use and development off the Oregon coast is the potential impact on...
2012-04 (iso8601)
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In this paper, we illustrate characteristics of food system of tuna by making a bird’s-eye view of tuna
trade and global distribution. Tuna resources are primarily consumed as canned tuna or Sashimi (=raw
fish). The fishing methods and species...
2006-11 (iso8601)
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5 p.; Caption title; "November 13, 2001."
2024-05-21
2006-12-01 2006-04-18 |
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Developing accurate predictive distribution models requires adequately representing relevant spatial and temporal scales, as these scales are ultimately reflective of the relationships between distributions and influential environmental...
2017-01-05 (iso8601)
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Managing forest ecosystems for sustainable, multiple use requires forest resource
managers to understand how species composition and distribution vary across
environmental gradients and respond to landscape scale disturbance. A number of...
2005-06-01 (iso8601)
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Woody riparian vegetation is an essential component of riparian ecosystems, responsible in part for the maintenance of functional ecological processes. The plant community composition and distribution provide an indication of the underlying...
2008-06-17T16:01:36Z (iso8601)
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Astragalus diaphanus is a rare plant endemic to the
John Day River drainage of north-central Oregon. This
species has several interesting features, including the
dimorphism of its fruit and its geographical isolation from
the two nearest...
1990-12-07 (iso8601)
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The vast majority of terrestrial plant species live in symbiosis with arbuscular mycorrhizal fungi (AMF). AMF and plants live in complex networks, with roots of individual plants hosting multiple AMF, and single AMF colonizing multiple plants...
2012-09-06 (iso8601)
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The growth of Alnus acuminata (HBK) 0. Ktze, Cupressus
lusitanica Mill., Gmelina arborea Roxb, Pinus caribaea var. hondurensis
Barr. & Golf., and Tectona grandis L. in Costa Rica and
twenty seven soil and climatic factors were analyzed to...
1983-11-28 (iso8601)
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A taxonomic study was made on the genera Rhynchophorus and
Dynamis of the weevil family Curculionidae which includes all of the
species known to occur in the world. The bibliography lists all the
important papers published to date on the taxonomy...
1965-08-27 (iso8601)
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Selected zooplankton from three oligotrophic lakes in Oregon were studied to determine whether or not their instantaneous birth rates and densities could be used in lake classification. The species of zooplankton studied in their respective lakes...
1971-04-09 (iso8601)
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I examined the avian biogeography of the islands of Lago Gatun, Panama, in an effort to better understand the effects of forest fragmentation in this biodiverse region, and specifically to understand the importance of fragment isolation and the...
2006-03-23T18:23:44Z (iso8601)
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The ecological interrelationships of mites occurring in
and near the Hood River Valley, Oregon, pome fruit orchards
were investigated to determine the possibility of an integrated
control program using the species already present.
Survey sampling...
1963-10-12 (iso8601)
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Fifty species and subspecies and six varieties in eight genera of
the family Tabanidae are recognized from Oregon. The following genera
are represented in Oregon: Apatolestes Williston, Pilimas Brennan,
Stonemyia Brennan, Silvius Meigen, Chrysops...
1979-08-20 (iso8601)
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8 p.; "September 17, 2002"; Mr. Bingaman submitted the following report to accompany H.R. 2828
2024-05-21
2006-11-27 2006-04-18 |
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Bimonthly plankton samples were collected from 1969 through
1971 along a transect off the central Oregon continental shelf (44°
39. l'N) to document the species of crab larvae present, their seasonality,
and their onshore-offshore distribution in...
1975-06 (iso8601)
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