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ScholarsArchive at Oregon State University
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Most studies dealing with the use of ecological indicators and other applied ecological research rely on some definition or concept of what constitutes least-, intermediate- and most-disturbed condition. Currently, most rigorous methodologies...
2013-02 (iso8601)
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A hierarchical classification system of Iceland's
watersheds and rivers is presented. The classification
is based on Iceland's substrate, climate, water, biota,
and human cultural influences. The geological formations
of Iceland are very different...
1990-05-17 (iso8601)
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Patterns of nest attendance behavior by breeding birds represent a parent-offspring
trade-off in which adults balance self-maintenance with parental care decisions.
Incubation, in particular, is of interest because adults must provide an...
2013-03-05 (iso8601)
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San Francisco Bay is a proposed relocation site for some of the Caspian terns Hydroprogne caspia currently nesting at the world's largest colony for the species in the Columbia River estuary and consuming salmonids listed under the U. S....
2012-11-01 (iso8601)
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Identification of the factors that influence susceptibility to predation can aid in developing management strategies to recover fish populations of conservation concern. Predator-prey relationships can be influenced by numerous factors, including...
2012-10-15 (iso8601)
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Large population sizes and global distributions generally associate with high mitochondrial DNA control region (CR) diversity. The sperm whale (Physeter macrocephalus) is an exception, showing low CR diversity relative to other cetaceans; however,...
2013 (iso8601)
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Non-breeding sooty shearwaters are the most abundant seabird in the California Current Large Marine Ecosystem (CCLME) during boreal spring and summer months. This, combined with relatively great energy demands, reliance on patchy, shoaling prey...
2012-02-06 (iso8601)
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Debris flows, common disturbances in many mountainous areas, initially scour or bury stream habitats; however, debris flows deliver vast amounts of wood, boulders, and gravel that may ultimately form complex stream habitat to potentially support a...
2013-02-18 (iso8601)
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Rangelands are significant providers of ecosystem services in agroecosystems world-wide. Yet
few studies have investigated how different intensities of livestock grazing impact one important provider
of these ecosystem services—native bees. We...
2012-10 (iso8601)
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I studied bird and rodent nesting in woodpecker-excavated
cavities in pifion-juniper (Pinus edulis-Juniperus monosperma) (P-J)
woodland in southeastern Colorado during the spring and summer of 1987
and 1988. Two related investigations were...
1990-10-15 (iso8601)
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The garibaldi, Hypsypops rubicundus, is a sexually
monochromatic pomacentrid found in rocky subtidal areas of
Southern and Baja California. During the spawning season,
males attempt to attract females to a nest of red algae
located within...
1990-05-09 (iso8601)
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Aquatic ecosystems continue to be increasingly affected by climate warming. For salmonids in the Pacific Northwest of North America, increasing temperatures pose tighter thermal constraints on their habitat use as well as aspects of their...
2013-03-08 (iso8601)
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The mechanisms of mortality during critical life stages of fish are not well-understood and, for many species, it is not clear if the mechanisms are similar for naturally and artificially propagated individuals. For Chinook salmon (Oncorhynchus...
2013-03-12 (iso8601)
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Marine protected areas (MPAs) are increasingly being used as a conservation tool for highly mobile marine vertebrates and the focus is typically on protecting breeding areas where individuals are aggregated seasonally. Yet movements during the...
2013-02-14 (iso8601)
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Greater Sage-Grouse (Centrocercus urophasianus) depend on sagebrush habitat for food and cover during winter, yet few sage-grouse winter ecology studies have been conducted. During January and February 2007, we monitored 22 radio-collared...
2011-11 (iso8601)
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The distribution and geographic range of Greater Sage-Grouse (Centrocercus urophasianus) have been reduced by 56% since European settlement. Although loss and fragmentation of sagebrush (Artemisia spp.) habitats have been cited as the primary...
2011-12 (iso8601)
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Size-structured spatial patterns in larvae of 2 sucker and 3 minnow species are described from fixed-site
sampling in Upper Klamath Lake, Oregon, and are used to demonstrate patterns of size-based losses downstream and
retention in the lake. The...
2011-12 (iso8601)
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The fossil species Arrhinolemur scalabrinii, which was described from late Miocene deposits of Entre Ríos, Argentina, is reevaluated. Whereas the species was originally placed in the Primates (Mammalia) and later made the unique member of the...
2012-07 (iso8601)
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There are three recognized species of Siphateles from the Great Basin; S. alvordensis, S. boraxobius and the tui chub, S. bicolor. One species, S. boraxobius, is endangered and one population of tui chub at Hutton Spring is threatened. Despite...
2013-03-15 (iso8601)
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The fitness of female Pacific salmon (Oncorhynchus spp.) with respect to breeding behavior can be partitioned into at least four components: survival to reproduction, competition for breeding sites, success of egg incubation, and suitability of...
2013-03-22 (iso8601)
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Range, areas of concentrated activity, and dispersal characteristics for juvenile Steller sea lions Eumetopias jubatus in the endangered western population (west of 144° W in the Gulf of Alaska) are poorly understood. This study quantified space...
2013-03-21 (iso8601)
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We examined the distribution of Umpqua Chub Oregonichthys kalawatseti, an endemic, vulnerable minnow in western Oregon, and whether six ecological populations (based on distribution patterns) had sufficient genetic cohesion to be considered...
2013-02-11 (iso8601)
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Steelhead and rainbow trout are common names for marine-migratory (anadromous) and freshwater-resident forms of Oncorhynchus mykiss, a partially migratory salmonid fish. Anadromous and resident forms are sympatric and can produce offspring with a...
2013-03-18 (iso8601)
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