scholarly journals Experiments with Seasonal Forecasts of ocean conditions for the Northern region of the California Current upwelling system

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Samantha A. Siedlecki ◽  
Isaac C. Kaplan ◽  
Albert J. Hermann ◽  
Thanh Tam Nguyen ◽  
Nicholas A. Bond ◽  
...  
Keyword(s):  
California Current ◽  
Northern Region ◽  
Seasonal Forecasts ◽  
Upwelling System ◽  
Ocean Conditions

Spatial patterns of large jellyfish Chrysaora plocamia blooms in the Northern Humboldt Upwelling System in relation to biological drivers and climate

2018 ◽  
Vol 75 (4) ◽  
pp. 1405-1415 ◽  
Author(s):  
Javier Quiñones ◽  
Luciano M Chiaverano ◽  
Patricia Ayón ◽  
Grant D Adams ◽  
Hermes W Mianzan ◽  
...  
Keyword(s):  
Population Size ◽  
Chlorophyll A ◽  
Spatial Patterns ◽  
Northern Region ◽  
Spatial Extent ◽  
Chl A ◽  
Upwelling System ◽  
Geographic Patterns ◽  
The World ◽  
Eggs And Larvae

Abstract In the Northern Humboldt Upwelling System (NHUS), one of the most productive ecosystems in the world, the large jellyfish Chrysaora plocamia exhibits high inter-annual variability in population size, often resulting in massive blooms. In this study, we examined the geographic patterns C. plocamia in the NHUS and their spatial overlap with ichthyoplankton, zooplankton, and chlorophyll a concentration (Chl a) during two El Niño (EN) years (1982–1983 and 1986–1987), and a neutral year (2014). During EN years, the spatial extent of C. plocamia medusae was larger than in the neutral year. In 1982–1983, medusae were concentrated mainly in the central-southern and southern regions of Peru, where they were associated with zooplankton, sardine larvae, and Chl a. In 1986–1987, medusae occurred in the northern and southern regions and spatially overlapped with sardine larvae and Chl a, and with zooplankton and anchoveta larvae, respectively. In 2014, medusae occurred mainly in the northern region, where they were associated with zooplankton, Chl a, and anchoveta eggs and larvae. Our results indicate strong EN effects on the distribution and abundance of C. plocamia, which can have consequences for zooplankton and ichthyoplankton abundance, as well as fisheries, in the NHUS.

scholarly journals Applied Fisheries Oceanography: Ecosystem Indicators of Ocean Conditions Inform Fisheries Management in the California Current

Oceanography ◽  
2014 ◽  
Vol 27 (4) ◽  
pp. 80-89 ◽  
Author(s):  
William Peterson ◽  
◽  
Jennifer Fisher ◽  
Jay Peterson ◽  
Cheryl Morgan ◽  
...  
Keyword(s):  
Fisheries Management ◽  
California Current ◽  
Ecosystem Indicators ◽  
Ocean Conditions ◽  
Fisheries Oceanography

Recent trends in the wind-driven California current upwelling system

2021 ◽  
Vol 261 ◽  
pp. 112486
Author(s):  
Y. Quilfen ◽  
J. Shutler ◽  
J.-F. Piolle ◽  
E. Autret
Keyword(s):  
California Current ◽  
Upwelling System ◽  
Recent Trends

Wintertime ocean conditions synchronize rockfish growth and seabird reproduction in the central California Current ecosystem

2010 ◽  
Vol 67 (7) ◽  
pp. 1149-1158 ◽  
Author(s):  
Bryan A. Black ◽  
Isaac D. Schroeder ◽  
William J. Sydeman ◽  
Steven J. Bograd ◽  
Peter W. Lawson
Keyword(s):  
Time Series ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Southern Oscillation ◽  
California Current ◽  
Data Set ◽  
Central California ◽  
Components Analysis ◽  
Ocean Conditions ◽  
Upwelling Index

Chronologies developed from annual growth-increment widths of splitnose rockfish ( Sebastes pinniger ) and yelloweye rockfish ( Sebastes ruberrimus ) otoliths were compared with time series of lay date and fledgling success for the common murre ( Uria aalge ) and Cassin’s auklet ( Ptychoramphus aleuticus ) in the north-central California Current. All time series were exactly dated and spanned 1972 through 1994. In a principal components analysis, the leading principal component (PC1bio) accounted for 64% of the variance in the data set. By entering the upwelling index, the Northern Oscillation index, sea surface temperatures, and the multivariate ENSO (El Niño Southern Oscillation) index into principal components analysis, a time series of environmental variability PC1env was developed for each month of the year. Over the interval 1972 through 1994, PC1bio most strongly correlated with PC1env for February and, to a lesser extent, January and March. Moreover, when each of the six biological time series was related to the 12 PC1env through stepwise multiple regression, February was always the most significant (p < 0.01). The same was true if upwelling index was substituted for PC1env. As upper-trophic predators, rockfish and seabirds independently corroborate that wintertime ocean conditions are critical for productivity in the California Current ecosystem.

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