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ScholarsArchive at Oregon State University
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The North Pacific humpback whale (Megaptera novaeangliae) population has been increasing at an average annual rate of ~6% since the early 1990s. In northern Southeast Alaska alone, there are now more whales than estimated for the entire North...
2011-05-09 (iso8601)
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Data are presented on the life history of snake
pricklebacks, Lumpenus sagitta, collected in Yaquina Bay,
Oregon, from June 1977 to October 1978. Specimens were
collected primarily by beach seine from four sampling sites
in the bay. Snake...
1979-08-27 (iso8601)
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Caspian terns (Hydroprogne caspia) and double-crested cormorants
(Phalacrocorax auritus) nest in large colonies on East Sand Island in the Columbia
River estuary, the largest known colonies for the two species in the world. Both
species of...
2012-01-13 (iso8601)
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Pacific lamprey (Entosphenus tridentatus) are experiencing population declines throughout their range. Xenobiotics could be an important risk factor for lamprey populations. Our goal was to establish if common herbicides, as used in forest...
2012-02-07 (iso8601)
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I used a comparative and experimental approach to examine nest habitat
selection, reproductive success, and nest site fidelity of burrowing owls (Athene
cunicularia) in a large, non-fragmented grassland in southwest California. In 1999,
I compared...
2002-02-21 (iso8601)
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The federally threatened northern spotted owl (Strix occidentalis caurina) is the focus of intensive conservation efforts that have led to much forested land being reserved as habitat for the owl and associated wildlife species throughout the...
2012-03-02 (iso8601)
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Fishery dependent data--length distributions, sex ratios, maturity schedules, and
species composition of landed catches--are necessary for stock assessments.
These data are currently collected by state port biologists using a sampling design
that...
2000-11-17 (iso8601)
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Results of this study suggest that laboratory growth of full-sib families of five
month old Pacific oyster spat can be predictive of growth to market size at different
grow-out sites. Seven to ten millimeter spat were selected from each of fifteen...
1999-08-16 (iso8601)
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A new method for encapsulating low-molecular weight, water-soluble substances
in lipid-walled microcapsules (LWMs) for delivery to marine bivalves was developed,
characterized, and tested. LWMs produced by a spray technique (spray microcapsules,...
1994-12-12 (iso8601)
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Habitat loss and fragmentation is a crisis affecting wildlife worldwide. In Tanzania, East Africa, a dramatic and recent (<80 years) expansion in human settlement and agriculture threatens to reduce gene flow among protected areas for many species...
2012-02-27 (iso8601)
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Stock assessments for many U.S. Pacific coast groundfish stocks are developed using
the catch-at-age method known as Stock Synthesis. In this work a simulation package was
developed and used to evaluate the sensitivity of the Stock Synthesis...
2001-09-28 (iso8601)
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Understanding the movement behavior and foraging strategies of individuals across multiple spatial and temporal scales is essential not only for understanding the biological requirements of individuals but also for linking individual strategies to...
2012-03-12 (iso8601)
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Nine isolates of bacteria recovered from fish dying at
marine facilities were collected from different geographic areas.
The strains included: an isolate from chinook salmon (Oncorhynchus
tshawytscha) reared in net pens in New Zealand, an isolate...
1987-09-15 (iso8601)
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The microsporidian parasite Nadelspora canceri infects Dungeness crabs, Cancer
magister, along the United States Pacific Northwest coast. The prevalence and seasonal
variation of N. canceri in Dungeness crabs from Alsea Bay, Oregon, are described...
1994-05-16 (iso8601)
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Despite the importance of Pacific cod in Bering Sea fisheries and foodwebs, little is known about the habitat use and the distribution of early life stages. We analysed 6 years of catch data for 0-group Pacific cod in fishery-independent surveys...
2012-03 (iso8601)
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We described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss in the John Day River watershed, Oregon. We collected 149 juvenile O. mykiss across 72 sites and identified locations used by anadromous...
2012-04 (iso8601)
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Questions relating to economic performance, biological conservation and variation in
resource abundance and harvest of ocean shrimp have led to increasing pressure for
management action. Developing effective management policies for this highly...
2005-02-23 (iso8601)
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Overfished species of rockfish, Sebastes spp., from the Northeast Pacific experience high bycatch mortality because of ‘barotrauma’, a condition induced from the rapid change in pressure during capture. Field experiments show that it may be...
2012-04 (iso8601)
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Lake trout Salvelinus namaycush in the Laurentian Great Lakes suffer from thiamine deficiency as a result of adult lake trout consuming prey containing thiaminase, a thiamine-degrading enzyme. Sufficiently low egg thiamine concentrations result in...
2011 (iso8601)
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Management strategies to prevent overfishing while achieving optimum yield vary according to the available data and life history of the fished stock. I evaluated two sets of management strategies for Pacific coast rockfish: strategies to set...
2012-02-24 (iso8601)
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The purpose of this research was to explore the impact of finfish bycatch on
the ocean shrimp Pandalus jordani fishery using two methods. One method looked at
the breakage of the shrimp by finfish bycatch in the nets. The other looked at the...
2001-10-17 (iso8601)
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This study examines the spatial and temporal distribution and life
history of the "offshore" component of the Northeastern Pacific spiny dogfish
(Squalus acanthias) population. Distribution was examined in relation to
latitude, depth, the Columbia...
2004-05-24 (iso8601)
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In the tropics, widespread deforestation and conversion of primary forests to
agricultural and pasture lands has resulted in losses of composition, structure, and functions
of forest landscapes. Deforestation in the tropics is typically preformed...
2001-05-02 (iso8601)
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2004-12-08 (iso8601)
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Current bioassessment efforts are focused on small wadeable streams, at least partly because assessing ecological conditions in non-wadeable large rivers poses many additional challenges. In this study, we sampled 20 sites in each of seven large...
2012-03 (iso8601)
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