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601 - 625 of 1229 Items << < 20 21 22 23 24 25 26 27 28 29 > >>
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Evaluating the relative influences of positive and negative interactions in
shaping communities is a major topic in modern ecology. Facilitative interactions
between basal species are important in habitats with intense predation pressure or
severe...
2001-05-15 (iso8601)
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Twenty-one thousand fish representing 9 orders, 14 families and 56 species were collected from various habitats of the Navasota River drainage. Some species such as Notropis lutrensis, Gambusia affinis and Lepomis macrocllirlls were taken...
2011-06-30
2011-06-30 1972-08-01 |
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The backscattering properties of marine phytoplankton, which are assumed to vary widely with differences in size, shape, morphology and internal structure, have been directly measured in the laboratory on a very limited basis. This work presents...
2010-07-05 (iso8601)
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To quantify the distribution and abundance of the riparian-associated vertebrate
community, I surveyed streams in four basins in the Oregon Coast Range, 1992-1994. I
observed mostly birds with fewer observations of mammals. Belted Kingfishers...
1997-07-21 (iso8601)
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Substrate associations and longitudinal distributions are described for 12 species of Ephemerellidae. Habitat specialization seems to have been a major means of adaptive radiation within this family. All species showed restrictive use of available...
1984-01-01
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Netarts Bay is a coastal lagoon on the northern Oregon coast. Four major sedimentary environments are recognized including channel, sand flats, mud flats, and marsh. Fine-grained sediment is carried in by streams and deposited in the marshes and...
1966-04-21 (iso8601)
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A study of the phyletic relationships among five species of
tragopans and an outgroup, the Blood Pheasant (Ithaginis cruentus), was
conducted from 1987 to 1991. Biochemical, behavioral, and external
morphologic characteristics were compared. A...
1991-12-06 (iso8601)
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The Gerald W. Williams Slides consist of more than 15,000 35 mm color photographic slides taken and assembled by Williams in the course of his work as a Forest Service sociologist and historian and due to his avocational interest in the history of...
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Here presented is a photographic catalogue, a key, and literature review for the 35 genera and 90 species of lepturine longhorn beetles (Cerambycidae: Lepturinae) found in the Pacific Northwest. Several nomenclatural changes, recognized by the...
2014-09-25 (iso8601)
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In Yaquina Bay, Oregon, I observed very little overlap in the distribution of the
invasive green crab, Carcinus maenas, and the larger red rock crab, Cancer productus.
Red rock crabs dominate the more saline, cooler lower estuary and green crabs,...
2001-06-08 (iso8601)
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The feeding ecology of a common temperate
mesoherbivore, the oligophagous sea slug Placida
dendritica (Gastropoda: Opisthobranchia: Ascoglossa), was
examined from April 1985 to June 1989. Along the central
coast of Oregon, Placida consumed three...
1989-08-18 (iso8601)
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Two trials were conducted to evaluate changes in the quantity, quality, and moisture of available forage in the pasture, and shrub utilization by cattle during a 30-d late summer grazing period (Trial 1) and the effect of cow age (experience) on...
2006-10-10T19:54:06Z (iso8601)
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Ungulates comprise some of the most well researched and intensely managed wildlife populations on earth. As such, they are recognized as ideal study subjects for developing and modifying management tools or theories (Danell et al. 1994, Shipley...
2015-02-25 (iso8601)
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"Holistic planning for Lake Ewauna & the south entry to the City of Klamath Falls"
2024-09-21
2005-06-06 2005-06-06 2005-06-06 |
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Epiphytic diatom assemblages in the intertidal zone of Yaquina
Bay and estuary were obtained from the following host macrophytes:
Zostera marina, Fucus evanescens, and species of Enteromorpha,
Polysiphonia, and Ulva. Samples were collected in...
1972-05-31 (iso8601)
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This study assessed the effects of thinning on arthropod communities on
understory plants in the Central Oregon Coast Range. Arthropods were sampled
from five understory plants in five pairs of thinned and unthinned, young (50-80
yrs), managed...
2000-05-05 (iso8601)
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This study was designed to learn the effect a specific herbicide practice on plant communities. Data were obtained from brushfields that had been aerially sprayed with 2,4-D (2,4 dichiorophenoxyacetic acid) and/or 2,4,5-T (2,4,5...
1968-06-03 (iso8601)
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Riparian vegetation patterns within the blast,
downstream of blast, and airfall tephra zones of Mount
St. Helens are related to initial and secondary volcanic
disturbance, post-eruption fluvial landforms, channel
geometry, and streamflow...
1987-04-29 (iso8601)
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1. Aquatic ecologists are working to develop theory and techniques for analysis of dynamic stream processes and communities of organisms. Such work is critical for the development of conservation plans that are relevant at the scale of entire...
2012-05 (iso8601)
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The taxonomic placement of Gadopsidae is discussed and an evaluation of its osteological relationships with related families is given. Similarities to the more primitive genera of the trachinoids, notothenioids, and uranoscopoids are noted and the...
1966-05-09 (iso8601)
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Pendent Usnea species were collected in western Oregon and examined.
Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter;
branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus...
1995-03-14 (iso8601)
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The nearshore waters off the Oregon coast (< 73 meters) are a region of high productivity and economic value, with a variety of habitats that include rock outcrops. Temperate reef habitats are important to many commercially important fishes...
2012-11-30 (iso8601)
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The shallow, wave-swept sea floor off the central Oregon coast
is used by 0-age flatfishes as a nursery ground. This dissertation
is based on a series of projects designed to: 1) identify the dominant
meiobenthic nematodes present in a coastal...
1981-10-13 (iso8601)
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