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Warming Ocean Conditions Relate to Increased Trophic Requirements of Threatened and Endangered Salmon

Creator:: Daly, Elizabeth A. and Brodeur, Richard D.
Abstract:: The trophic habits, size and condition of yearling Chinook salmon (Oncorhynchus tshawytscha) caught early in their marine residence were examined during 19 survey years (1981–1985; 1998–2011). Juvenile salmon consumed distinct highly piscivorous diets in cold and warm ocean regimes with major differences between ocean regimes driven by changes in consumption...
Resource Type:: Article
Full Text:: Requirements of Threatened and Endangered Salmon Daly, E. A., & Brodeur, R. D. (2015). Warming Ocean

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:: after ocean entry, the majority of the diets of juvenile salmon are made up of 0-age fish prey (Daly et

Ontogenetic shifts in diets of juvenile and subadult coho and chinook salmon in coastal marine waters: important for marine survival?

Creator:: Daly, Elizabeth A., Brodeur, Richard D., and Weitkamp, Laurie A.
Abstract:: Successfully shifting to a more piscivorous diet may be an important factor in the growth and survival of juvenile coho salmon Oncorhynchus kisutch and Chinook salmon O. tshawytscha during their first summer in the northern California Current. Nonmetric multidimensional scaling and cluster analysis of diets by size showed several distinct...
Resource Type:: Article
Full Text:: Marine Survival? Elizabeth A. Daly a , Richard D. Brodeur b & Laurie A. Weitkamp b a Cooperative

Diel Feeding Chronology, Gastric Evacuation, and Daily Food Consumption of Juvenile Chinook Salmon in Oregon Coastal Waters

Creator:: Benkwitt, Cassandra E., Brodeur, Richard D., Hurst, Thomas P., and Daly, Elizabeth A.
Abstract:: The diel feeding periodicity of juvenile Chinook salmon Oncorhynchus tshawytscha was determined from stomachs collected in coastal waters off Oregon in 2000 and 2003. Juvenile Chinook salmon exhibited a diurnal feeding pattern with morning and evening feeding periods. There were differences in the duration and magnitude of the dawn and...
Resource Type:: Article
Full Text:: , R. D., E. A. Daly, M. V. Sturdevant, T. W. Miller, J. H. Moss, M. E. Thiess, M. Trudel, L. A

RuzickaEvidencethatSummerJellyfish.pdf

Creator:: Ruzicka, James J., Daly, Elizabeth A., and Brodeur, Richard D.
Abstract:: Interannual variability in salmon (Oncorhynchus spp.) production in the northeast Pacific is understood to be driven by oceanographic variability and bottom-up processes affecting prey availability to juvenile salmon. Scyphozoan jellyfish have an important role in shaping the pathways of energy flow through pelagic food webs. While jellyfish obtain high production...
Full Text:: . Daly, and R. D. Brodeur. 2016. Evidence that summer jellyfish blooms impact Pacific Northwest salmon

Large medusae in surface waters of the Northern California Current: variability in relation to environmental conditions

Creator:: Suchman, Cynthia L., Brodeur, Richard D., Daly, Elizabeth A., and Emmett, Robert L.
Abstract:: Blooms of jellyfish around the world have been correlated with climatic variables related to environmental causes. Sizeable populations of large medusae, primarily Chrysaora fuscescens and Aequorea sp., appear annually in shelf waters of the Northeast Pacific Ocean. Previous research has shown that C. fuscescens is abundant seasonally in the inner...
Resource Type:: Article
Full Text:: –111. Brodeur, R. D., C. L. Suchman, D. Reese, T. Miller & E. Daly, 2008b. Spatial overlap and

Diet variability of forage fishes in the Northern California Current System

Creator:: Hill, Andrew D., Daly, Elizabeth A., and Brodeur, Richard D.
Abstract:: As fisheries management shifts to an ecosystem-based approach, understanding energy pathways and trophic relationships in the Northern California Current (NCC) will become increasingly important for predictive modeling and understanding ecosystem response to changing ocean conditions. In the NCC, pelagic forage fishes are a critical link between seasonal and interannual variation...
Resource Type:: Article
Full Text:: System Hill, A. D., Daly, E. A., & Brodeur, R. D. (2015). Diet variability of forage fishes in the

Surface distribution of brachyuran megalopae and ichthyoplankton in the Columbia River plume during transition from downwelling to upwelling conditions

Creator:: Roegner, G. Curtis, Daly, Elizabeth A., and Brodeur, Richard D.
Abstract:: In the California Current coastal boundary zone, the spring transition between downwelling and upwelling conditions, along with the fluctuating structure of the Columbia River plume, creates highly dynamic interactions. In this study, we investigated whether the surface distribution of brachyuran larvae and ichthyoplankton would track the dynamics of the Columbia...
Resource Type:: Article
Full Text:: during transition from downwelling to upwelling conditions G. Curtis Roegner a,n, Elizabeth A. Daly b

RuzickaEvidencethatSummerJellyfishSupplementalTables.pdf

Creator:: Ruzicka, James J., Daly, Elizabeth A., and Brodeur, Richard D.
Abstract:: Interannual variability in salmon (Oncorhynchus spp.) production in the northeast Pacific is understood to be driven by oceanographic variability and bottom-up processes affecting prey availability to juvenile salmon. Scyphozoan jellyfish have an important role in shaping the pathways of energy flow through pelagic food webs. While jellyfish obtain high production...
Full Text:: salmon production James J. Ruzicka,† Elizabeth A. Daly, and Richard D. Brodeur † Corresponding

Juvenile Steelhead Distribution, Migration, Feeding, and Growth in the Columbia River Estuary, Plume, and Coastal Waters

Creator:: Daly, Elizabeth A., Scheurer, Julie A., Brodeur, Richard D., Weitkamp, Laurie A., Beckman, Brian R., and Miller, Jessica A.
Abstract:: Relative to extensive research on the freshwater stages of steelhead Oncorhynchus mykiss life history, little is known about the species’ estuarine and early marine phases despite the decline of numerous populations, including several from the Columbia River. Comparisons of the distribution, diet, and growth of juvenile steelhead collected during surveys...
Resource Type:: Article
Full Text:: ] at 0 8: 04 2 1 N ov em be r 20 14 64 DALY ET AL. phase of steelhead life history and

ScholarsArchive@OSU

Warming Ocean Conditions Relate to Increased Trophic Requirements of Threatened and Endangered Salmon

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

Ontogenetic shifts in diets of juvenile and subadult coho and chinook salmon in coastal marine waters: important for marine survival?

Diel Feeding Chronology, Gastric Evacuation, and Daily Food Consumption of Juvenile Chinook Salmon in Oregon Coastal Waters

RuzickaEvidencethatSummerJellyfish.pdf

Large medusae in surface waters of the Northern California Current: variability in relation to environmental conditions

Diet variability of forage fishes in the Northern California Current System

Surface distribution of brachyuran megalopae and ichthyoplankton in the Columbia River plume during transition from downwelling to upwelling conditions

RuzickaEvidencethatSummerJellyfishSupplementalTables.pdf

Juvenile Steelhead Distribution, Migration, Feeding, and Growth in the Columbia River Estuary, Plume, and Coastal Waters

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