Index Catalog // ScholarsArchive@OSU

Timing of Population Fragmentation in a Vulnerable Minnow, the Umpqua Chub, and the Role of Nonnative Predators

Creator:: O’Malley, Kathleen G., Markle, Douglas F., and Ardren, William R.
Abstract:: 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 evolutionary populations. We also evaluated the influence of Holocene geological events and recent nonnative predator introductions on the...
Resource Type:: Article
Full Text:: a , Douglas F. Markle b & William R. Ardren c a Coastal Oregon Marine Experiment Station, Hatfield

Factors influencing density, distribution, and mesohabitat selection of juvenile wild salmonids and residual hatchery winter steelhead

Creator:: Brignon, William R., Olson, Douglas E., Schaller, Howard A., and Schreck, Carl B.
Abstract:: To best manage Eagle Creek National Fish Hatchery, negative interactions between hatchery salmonids and Endangered Species Act listed wild salmonids in the Eagle Creek Basin need to be minimized. Our objectives were: 1) to compare summer rearing densities in two similar streams, where one stream received a release of hatchery...
Resource Type:: Article
Full Text:: selection of juvenile wild salmonids and residual hatchery winter steelhead William R. Brignon a,b

Agricultural land use and macroinvertebrate assemblages in lowland temporary streams of the Willamette Valley, Oregon, USA

Creator:: Gerth, William J., Li, Judith, and Giannico, Guillermo R.
Abstract:: Streams that dry during part of the year are common throughout the world, yet studies of the macroinvertebrate assemblages in these types of streams are rare compared to those in permanent streams; and studies that assess the effects of agriculture on temporary stream invertebrates are even rarer. We studied macroinvertebrate...
Resource Type:: Article

When is bigger better? Early marine residence of middle and upper Columbia River spring Chinook salmon

Creator:: Tomaro, Londi M., Teel, David J., Peterson, William T., and Miller, Jessica A.
Abstract:: Early ocean residence is considered a critical period for juvenile salmon although specific survival mechanisms are often unidentified and may vary by species or life stage. Columbia River spring-run Chinook salmon Oncorhynchus tshawytscha abundance has declined dramatically since the early 1900s. To elucidate mechanisms of early marine survival, we tested...
Resource Type:: Article
Full Text:: salmon Londi M. Tomaro1*, David J. Teel2, William T. Peterson3, Jessica A. Miller1 1Coastal Oregon

Comparing streambed light availability and canopy cover in streams with old-growth versus early-mature riparian forests in western Oregon

Creator:: Warren, Dana R., Keeton, William S., Bechtold, Heather A., and Rosi-Marshall, Emma J.
Abstract:: Light availability strongly influences stream primary production, water temperatures and resource availability at the base of stream food webs. In headwater streams, light is regulated primarily by the riparian forest, but few studies have evaluated the influence of riparian forest stand age and associated structural differences on light availability. In...
Resource Type:: Article
Full Text:: in western Oregon 2 3 Dana R. Warren1*, William S. Keeton2, Heather A. Bechtold3, Emma J. Rosi

Submersible observations of deep-reef fishes of Heceta Bank, Oregon

Creator:: Pearcy, William G., Stein, David L., Hixon, Mark Anthony, Pikitch, Ellen K., Barss, William H., and Starr, Richard M.
Abstract:: Rockfishes, Sebastes spp.. were the most numerous and speciose fishes seen during 16 submersible dives from 64 to 305 m depth in the vicinity of Heceta Bank off the coast of Oregon. Dense schools of juvenile rockfishes and large yellowtail rockfish, S. flavidus, were observed only over rocky, high relief...
Resource Type:: Article
Full Text:: Bank, Oregon W. G. Pearcy, D. L. Stein, M. A. Hixon, E. K. Pikitch, W. H. Barss, and R. M. Starr

Characterizing coal and mineral mines as a regional source of stress to stream fish assemblages

Creator:: Daniel, Wesley M., Infante, Dana M., Hughes, Robert M., Tsang, Yin-Phan, Esselman, Peter C., Wieferich, Daniel, Herreman, Kyle, Cooper, Arthur R., Wang, Lizhu, and Taylor, William W.
Abstract:: Mining impacts on stream systems have historically been studied over small spatial scales, yet investigations over large areas may be useful for characterizing mining as a regional source of stress to stream fishes. The associations between co-occurring stream fish assemblages and densities of various “classes” of mining occurring in the...
Resource Type:: Article
Full Text:: source of stress to stream fish assemblages Daniel, W. M., Infante, D. M., Hughes, R. M., Tsang, Y. P

Estimating vertebrate, benthic macroinvertebrate, and diatom taxa richness in raftable Pacific Northwest rivers for bioassessment purposes

Creator:: Hughes, Robert M., Herlihy, Alan T., Gerth, William J., and Pan, Yangdong
Abstract:: The number of sites sampled must be considered when determining the effort necessary for adequately assessing taxa richness in an ecosystem for bioassessment purposes; however, there have been few studies concerning the number of sites necessary for bioassessment of large rivers. We evaluated the effect of sample size (i.e., number...
Resource Type:: Article
Full Text:: T. Herlihy & William J. Gerth & Yangdong Pan Received: 15 November 2010 /Accepted: 8 June 2011

Assessing population-level variation in the mitochondrial genome of Euphausia superba using 454 next-generation sequencing

Creator:: Johansson, Mattias, Duda, Elizabeth, Sremba, Angela L., Banks, Michael, and Peterson, William
Abstract:: The Antarctic krill (Euphausia superba Dana 1852) is widely distributed throughout the southern ocean, where it provides a key link between primary producers and upper trophic levels and supports a major commercial fishery. Despite its ecological and commercial importance, genetic population structure of the Antarctic kill remains poorly described. In...
Resource Type:: Article
Full Text:: Johansson 1 , Elizabeth Duda 1,2 , Angela Sremba 1 , Michael Banks 1 , William Peterson 3

Is the diet of a typical shredder related to the physical habitat of headwater streams in the Brazilian Cerrado?

Creator:: Ferreira, Wander R., Ligeiro, Raphael, Macedo, Diego R., Hughes, Robert M., Kaufmann, Philip R., Oliveira, Leandro G., and Callisto, Marcos
Abstract:: Macroinvertebrates are important for processing leaf detritus in temperate streams, but studies about their role in tropical streams often present conflicting results. Via digestive tract analyses, we assessed the diets of Phylloicus sp. larvae (Trichoptera: Calamoceratidae), collected from streams of two southeastern Brazil river basins (Araguari, Sao Francisco). We classified...
Resource Type:: Article
Full Text:: physical habitat of headwater streams in the Brazilian Cerrado? Ferreira, W. R., Ligeiro, R., Macedo, D

ScholarsArchive@OSU

Timing of Population Fragmentation in a Vulnerable Minnow, the Umpqua Chub, and the Role of Nonnative Predators

Factors influencing density, distribution, and mesohabitat selection of juvenile wild salmonids and residual hatchery winter steelhead

Agricultural land use and macroinvertebrate assemblages in lowland temporary streams of the Willamette Valley, Oregon, USA

When is bigger better? Early marine residence of middle and upper Columbia River spring Chinook salmon

Comparing streambed light availability and canopy cover in streams with old-growth versus early-mature riparian forests in western Oregon

Submersible observations of deep-reef fishes of Heceta Bank, Oregon

Characterizing coal and mineral mines as a regional source of stress to stream fish assemblages

Estimating vertebrate, benthic macroinvertebrate, and diatom taxa richness in raftable Pacific Northwest rivers for bioassessment purposes

Assessing population-level variation in the mitochondrial genome of Euphausia superba using 454 next-generation sequencing

Is the diet of a typical shredder related to the physical habitat of headwater streams in the Brazilian Cerrado?

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