Search Results - "Sydeman, W J"

Climate change and wind intensification in coastal upwelling ecosystems by Sydeman, W. J., García-Reyes, M., Schoeman, D. S., Rykaczewski, R. R., Thompson, S. A., Black, B. A., Bograd, S. J.

“…In 1990, Andrew Bakun proposed that increasing greenhouse gas concentrations would force intensification of upwelling-favorable winds in eastern boundary…”
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Anticipated Effects of Climate Change on Coastal Upwelling Ecosystems by Bakun, A., Black, B. A., Bograd, S. J., García-Reyes, M., Miller, A. J., Rykaczewski, R. R., Sydeman, W. J.

“…Ecosystem productivity in coastal ocean upwelling systems is threatened by climate change. Increases in spring and summer upwelling intensity, and associated…”
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Spatio-temporal variability in prey harvest and reproductive ecology of a piscivorous seabird,Cerorhinca monocerata, in an upwelling system by Thayer, J. A., Sydeman, W. J.

“…Ocean climate affects the life history and demography of top marine predators through changes in local prey availability. In the California Current System,…”
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Estimating the impacts of fishing on dependent predators: a case study in the California Current by Field, J. C, MacCall, A. D, Bradley, R. W, Sydeman, W. J

“…Juvenile rockfish ( Sebastes spp.) are important prey to seabirds in the California Current System, particularly during the breeding season. Both seabird…”
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Diets of top predators indicate pelagic juvenile rockfish (Sebastes spp.) abundance in the California Current System by MILLS, K. L., LAIDIG, T., RALSTON, S., SYDEMAN, W. J.

“…ABSTRACT Diets of top predators may be useful indicators to the availability of forage fish in marine ecosystems. Juvenile rockfish (young‐of‐the‐year Sebastes…”
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Spring-time distributions of migratory marine birds in the southern California Current: Oceanic eddy associations and coastal habitat hotspots over 17 years by Yen, P.P.W., Sydeman, W.J., Bograd, S.J., Hyrenbach, K.D.

“…We used a 17-year time series of shipboard observations to address the hypothesis that marine birds associate with persistent hydrographic features in the…”
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Untangling the relationships among climate, prey and top predators in an ocean ecosystem by Wells, B. K., Field, J. C., Thayer, J. A., Grimes, C. B., Bograd, S. J., Sydeman, W. J., Schwing, F. B., Hewitt, R.

“…Successful ecosystem-based conservation of marine resources can benefit from quantitative indicators of ecosystem productivity, particularly if such indicators…”
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Effects of Age, Breeding Experience, Mate Fidelity and Site Fidelity on Breeding Performance in a Declining Population of Cassin's Auklets by Pyle, Peter, Sydeman, William J., Hester, Michelle

“…1. We examined how mate and site fidelity varied with age, experience and sex, and how age, breeding experience, mate experience, site experience and sex…”
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African Penguins and Localized Fisheries Management: Response to Butterworth and Ross-Gillespie by Sydeman, W J, Hunt, G L, Pikitch, E K, Parrish, J K, Piatt, J F, Boersma, P D, Kaufman, L, Anderson, D W, Thompson, S A, Sherley, R B

“…Abstract We present a response to Butterworth and Ross-Gillespie's (2022) comment on our perspectives on how forage fish fisheries are impacting the endangered…”
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Primary producer and seabird associations with AVHRR-derived sea surface temperatures and gradients in the southeastern Gulf of Alaska by O’Hara, P.D., Morgan, K.H., Sydeman, W.J.

“…Identification and characterization of critical habitat is an important component of marine conservation. In this study, we compare relative sea-surface…”
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Upper trophic level predators indicate interannual negative and positive anomalies in the California Current food web by Ainley, D. G., Sydeman, W. J., Norton, J.

“…We used a 21 yr time series of productivity for 6 seabird species nesting in large numbers at the Farallon Islands, 40 km offshore of San Francisco,…”
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Influence of Trophic Position and Feeding Location on Contaminant Levels in the Gulf of the Farallones Food Web Revealed by Stable Isotope Analysis by Jarman, Walter M, Hobson, Keith A, Sydeman, William J, Bacon, Corinne E, McLaren, Elizabeth B

“…In this study, we present the levels of organochlorine (∑DDT, ∑HCH, ∑chlordane, HCB, and ∑PCBs) and metal (Pb, Hg, and Se) contaminants and their relationship…”
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Seabirds and climate change: roadmap for the future by Sydeman, WJ, Thompson, SA, Kitaysky, A

“…Based in part on a symposium held at the first World Seabird Conference in September, 2010 in Victoria, BC, Canada, we present a Theme Section (TS) on the…”
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A multi-model approach to understanding the role of Pacific sardine in the California Current food web by Kaplan, Isaac C., Francis, Tessa B., Punt, André E., Koehn, Laura E., Curchitser, Enrique, Hurtado-Ferro, Felipe, Johnson, Kelli F., Lluch-Cota, Salvador E., Sydeman, William J., Essington, Timothy E., Taylor, Nathan, Holsman, Kirstin, MacCall, Alec D., Levin, Phillip S.

“…We develop a multi-model approach to explore how abundance of a forage fish (Pacific sardine Sardinops sagax) impacts the ecosystem and predators in the…”
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Relative influence of oceanic and terrestrial pressure systems in driving upwelling-favorable winds by García-Reyes, M., Sydeman, W. J., Black, B. A., Rykaczewski, R. R., Schoeman, D. S., Thompson, S. A., Bograd, S. J.

“…We use the 20th Century Reanalysis database to assess the influence of oceanic and terrestrial atmospheric pressure systems on winter and summer…”
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Breeding Performance in the Western Gull: Effects of Parental Age, Timing of Breeding and Year in Relation to Food Availability by Sydeman, William J., Penniman, Jay F., Penniman, Teresa M., Pyle, Peter, Ainley, David G.

“…(1) We studied age-specific breeding success of western gulls (Larus occidentalis) on south-east Farallon Island, California in relation to annual variation in…”
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PINNIPED POPULATION DYNAMICS IN CENTRAL CALIFORNIA: CORRELATIONS WITH SEA SURFACE TEMPERATURE AND UPWELLING INDICES by Sydeman, William J., Allen, Sarah G.

“…We investigated effects of marine climate variability on pinniped populations and assessed the initial stages of recovery following implementation of the U. S…”
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Non-stationary responses in anchovy (Engraulis encrasicolus) recruitment to coastal upwelling in the Southern Benguela by van der Sleen, Peter, Rykaczewski, Ryan R., Turley, Brendan D., Sydeman, William J., García-Reyes, Marisol, Bograd, Steven J., van der Lingen, Carl D., Coetzee, Janet C., Lamont, Tarron, Black, Bryan A.

“…Anchovy Engraulis encrasicolus is economically important and ecologically critical to the structure and function of the Benguela Current ecosystem, as it…”
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Trophic Relationships among Seabirds in Central California: Combined Stable Isotope and Conventional Dietary Approach by Sydeman, William J., Hobson, Keith A., Pyle, Peter, McLaren, Elizabeth B.

“…We used stable isotope analysis (SIA) and conventional techniques of diet assessment to determine marine trophic relationships in the Gulf of the Farallones,…”
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Ocean climate, euphausiids and auklet nesting: inter-annual trends and variation in phenology, diet and growth of a planktivorous seabird,Ptychoramphus aleuticus by Abraham, Christine L., Sydeman, William J.

“…Variability in ocean climate results in fluctuations in the timing and abundance of zooplankton. In turn, fluctuations in zooplankton as prey may have…”
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