Index Catalog // ScholarsArchive@OSU

Assessment of macroalgal nitrogen limitation in a seasonal upwelling region

Creator:: Fujita, Rodney M., Wheeler, Patricia A., and Edwards, Robert L.
Abstract:: The relationship between nitrogen (N) availability and the growth of macroalgae in a seasonal upwelling region (Yaquina Head, Oregon, USA) was investigated. Water column nutrient concentrations were relatively high and stable during the winter, decreased in early spring, and were highly variable in the summer and early fall. Periods of...
Resource Type:: Article
Full Text:: concentrations were low. The relationship between growth and internal N content for Pelvetiopsis limitata

Photoacclimation of natural phytoplankton communities

Creator:: Graff, Jason R., Westberry, Toby K., Milligan, Allen J., Brown, Matthew B., Dall’Olmo, Giorgio, Reifel, Kristen M., and Behrenfeld, Michael J.
Abstract:: ABSTRACT: Phytoplankton regulate internal pigment concentrations in response to light and nutrient availability. Chlorophyll a to phytoplankton carbon ratios (chl:C phyto) are commonly reported as a function of growth irradiance (Eg) for evaluating the photoacclimation response of phytoplankton. In contrast to most culture experiments, natural phytoplankton communities experience fluctuating environmental...
Resource Type:: Article
Full Text:: *Corresponding author: jrgraff@science.oregonstate.edu ABSTRACT: Phytoplankton regulate internal pigment

Macrofaunal modification of porewater advection: role of species function, species interaction, and kinetics

Creator:: Waldbusser, George G. and Marinelli, Roberta L.
Abstract:: ABSTRACT: Sedimentary habitats are complex associations of biotic, chemical, and physical processes comprising ‘ecosystem function’. The relative importance of these processes to biogeochemical cycling in highly reactive, permeable sediments remains poorly understood. We report results from several field experiments in a muddy-sand intertidal flat dominated by 2 functionally different types...
Resource Type:: Article
Full Text:: 1998, Waldbusser et al. 2004). The diagenetic setting, dictated by rates of organic input and internal

Altered search speed and growth: social versus independent foraging in two pelagic juvenile fishes

Creator:: Ryer, Clifford H. and Olla, Bori L.
Abstract:: Prior studies have demonstrated that juvenile walleye pollock Theragra chalcogramma forage socially in schools for spatially and temporally clumped food, but forage more independently for spatially and temporally dispersed food. One advantage of social foraging is that fish in schools may be able to locate more food clumps than fish...
Resource Type:: Article
Full Text:: speed response, with no difference in growth between food distributions. Our results demonstrate that

Light-induced growth of phytoplankton collected during the winter from the benthic boundary layer off Oregon, USA

Creator:: Wetz, Michael S., Wheeler, Patricia A., and Letelier, Ricardo M.
Abstract:: Despite the importance of the spring phytoplankton bloom off Oregon as a food source for zooplankton, little is known about the sources of phytoplankton seed stock for the bloom or its timing. Experiments were conducted in the late winter to determine if the benthic boundary layer (BBL) could be a...
Resource Type:: Article
Full Text:: data from the GLOBEC long-term observation program off Oregon, 2002 and 2003. Data Report no. 192

What sets lower limits to phytoplankton stocks in high-nitrate, low-chlorophyll regions of the open ocean?

Creator:: Strom, Suzanne L., Miller, Charles B., and Frost, Bruce W.
Abstract:: Phytoplankton biomass in high-nitrate, low-chlorophyll (HNLC) ocean regions exhibits a pronounced stability: variation occurs only within a narrow range of values. The magnitude of this variation has profound ecological and geochemical consequences. While mechanisms believed to set the upper limits to HNLC phytoplankton biomass (iron limitation, microherbivore grazing) have received...
Resource Type:: Article
Full Text:: , and no micrograzer mortality at low food levels. Laboratory observations of these same bio- logical

Evidence for selective mortality in marine environments: the role of fish migration size, timing, and production type

Creator:: Claiborne, Andrew M., Miller, Jessica A., Weitkamp, Laurie A., Teel, David J., and Emmett, Robert L.
Abstract:: The underlying causes of mortality during critical life stages of fish are not well understood, nor is it clear if these causes are similar for naturally versus artificially propagated (i.e. hatchery) individuals. To assess the importance of selective mortality related to production type (hatchery vs. naturally produced) and size at...
Resource Type:: Article
Full Text:: that emigrated in late July than the estuary catch. There was no evidence of selective mortality of

Comparison of larval development in domesticated and naturalized stocks of the Pacific oyster Crassostrea gigas exposed to high pCO₂ conditions

Creator:: Durland, Evan, Waldbusser, George, and Langdon, Chris
Abstract:: Ocean acidification (OA) has had significant negative effects on oyster populations on the west coast of North America over the past decade. Many studies have focused on the physiological challenges experienced by young oyster larvae in high pCO₂/low pH seawater with reduced aragonite saturation state (Ωarag), which is characteristic of...
Resource Type:: Article
Full Text:: seawater on metamor- phosis of pediveligers to spat were variable between years, with no effect of seawater

Winter ichthyoplankton biomass as a predictor of early summer prey fields and survival of juvenile salmon in the northern California Current

Creator:: Daly, Elizabeth A., Auth, Toby D., Brodeur, Richard D., and Peterson, William T.
Abstract:: Diets of juvenile coho Oncorhynchus kisutch and Chinook O. tshawytscha salmon are made up primarily of winter-spawning fish taxa in the late-larval and early juvenile stages that are undersampled in plankton and larger trawl nets. Although we have no direct measure of the availability of fish prey important to juvenile...
Resource Type:: Article
Full Text:: larger trawl nets. Although we have no direct measure of the availability of fish prey important to

Consequence of a superabundance of larval walleye pollock Theragra chalcogramma in the Gulf of Alaska in 1981

Creator:: Duffy-Anderson, J. T., Bailey, Kevin Mclean, and Ciannelli, Lorenzo
Abstract:: Abundances of larval walleye pollock in Shelikof Strait, Gulf of Alaska, in 1981 were far greater than any recorded estimates before that time or since (some patch estimates exceeded 100000 larvae per 10 m²). In spite of this extraordinary input, the ensuing 1981 year class was relatively poor. An examination...
Resource Type:: Article
Full Text:: with other studies that suggest that ichthyoplankton exert little or no influence on microzooplankton

ScholarsArchive@OSU

Assessment of macroalgal nitrogen limitation in a seasonal upwelling region

Photoacclimation of natural phytoplankton communities

Macrofaunal modification of porewater advection: role of species function, species interaction, and kinetics

Altered search speed and growth: social versus independent foraging in two pelagic juvenile fishes

Light-induced growth of phytoplankton collected during the winter from the benthic boundary layer off Oregon, USA

What sets lower limits to phytoplankton stocks in high-nitrate, low-chlorophyll regions of the open ocean?

Evidence for selective mortality in marine environments: the role of fish migration size, timing, and production type

Comparison of larval development in domesticated and naturalized stocks of the Pacific oyster Crassostrea gigas exposed to high pCO₂ conditions

Winter ichthyoplankton biomass as a predictor of early summer prey fields and survival of juvenile salmon in the northern California Current

Consequence of a superabundance of larval walleye pollock Theragra chalcogramma in the Gulf of Alaska in 1981

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