Do albacore exert top-down pressure on northern anchovy? Estimating anchovy mortality as a result of predation by juvenile north pacific albacore in the California current system

2011 ◽  
Vol 20 (3) ◽  
pp. 242-257 ◽  
Author(s):  
SARAH M. GLASER
Keyword(s):  
North Pacific ◽  
Current System ◽  
California Current ◽  
Top Down ◽  
California Current System ◽  
Northern Anchovy

scholarly journals The California Current System in relation to the Northeast Pacific Ocean circulation

2021 ◽  
Author(s):  
Guillermo Auad
Keyword(s):  
Los Angeles ◽  
Pacific Ocean ◽  
San Francisco ◽  
Ocean Circulation ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Current System ◽  
California Current ◽  
California Current System ◽  
The Mean

The California Current System is described in its regional setting using two modern datasets. Argo provides a broadscale view of the entire eastern North Pacific Ocean for the period 2004–2010, and the High Resolution XBT Network includes transects from Honolulu to San Francisco (1991–2010) and to Los Angeles (2008–2010). Together these datasets describe a California Current of 500–800 km width extending along the coast from 43°N to 23°N. The mean southward transport of the California Current is about 5 Sv off Central and Southern California, with about 2.5 Sv of northward flow on its inshore side. Interannual variations are 50% or more of the mean transports. The salinity minimum in the core of the California Current is supplied by the North Pacific Current and by freshwater from the northern continental shelf and modified by alongshore geostrophic and across-shore Ekman advection as well as eddy fluxes and air–sea exchange. The heat and freshwater content of the California Current vary in response to the fluctuating strength of the alongshore geostrophic flow. On its offshore side, the California Current is influenced by North Pacific Intermediate Waters at its deepest levels and by Eastern Subtropical Mode Waters on shallower density surfaces. In total, the sources of the California Current, its alongshore advection, and its strong interactions with the inshore upwelling region and the offshore gyre interior combine to make this a rich and diverse ecosystem. The present work reviews previous contributions to the regional oceanography, and uses the new datasets to paint a spatially and temporally more comprehensive description than was possible previously.

scholarly journals Temperature and salinity extremes from 2014-2019 in the California Current System and its source waters

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Alice S. Ren ◽  
Daniel L. Rudnick
Keyword(s):  
High Temperatures ◽  
North Pacific ◽  
Current System ◽  
California Current ◽  
Near Surface ◽  
California Current System ◽  
The North ◽  
Salinity Anomaly ◽  
The North Pacific ◽  
Source Waters

AbstractThe California Current System in the eastern North Pacific Ocean has experienced record high temperatures since the marine heatwave of 2014-2016. Here we show, through a compilation of data from shipboard hydrography, ocean gliders, and the Argo floats, that a high-salinity anomaly affected the California Current System from 2017-2019 in addition to the anomalously high temperatures. The salinity anomaly formed in 2015 in the North Pacific Subtropical Gyre and was subsequently advected into the California Current System, in a generation mechanism different from the events leading to the marine heatwaves of 2013/2014 and 2019 in the North Pacific. The salinity anomaly was unique in at least 16 years with an annual mean deviation from the long-term average greater than 0.2 and anomalies greater than 0.7 observed offshore. Our results imply that different source waters were found in the California Current from 2017-2019, with the near-surface California Current salinity rivaling that of the California Undercurrent.

scholarly journals Climate-driven aerobic habitat loss in the California Current System

2020 ◽  
Vol 6 (20) ◽  
pp. eaay3188 ◽  
Author(s):  
Evan M. Howard ◽  
Justin L. Penn ◽  
Hartmut Frenzel ◽  
Brad A. Seibel ◽  
Daniele Bianchi ◽  
...  
Keyword(s):  
Habitat Loss ◽  
Current System ◽  
Marine Ecosystem ◽  
Oxygen Demand ◽  
California Current ◽  
Regional Variability ◽  
California Current System ◽  
Large Fluctuations ◽  
Northern Anchovy ◽  
Species Specific

Climate warming is expected to intensify hypoxia in the California Current System (CCS), threatening its diverse and productive marine ecosystem. We analyzed past regional variability and future changes in the Metabolic Index (Φ), a species-specific measure of the environment’s capacity to meet temperature-dependent organismal oxygen demand. Across the traits of diverse animals, Φ exhibits strong seasonal to interdecadal variations throughout the CCS, implying that resident species already experience large fluctuations in available aerobic habitat. For a key CCS species, northern anchovy, the long-term biogeographic distribution and decadal fluctuations in abundance are both highly coherent with aerobic habitat volume. Ocean warming and oxygen loss by 2100 are projected to decrease Φ below critical levels in 30 to 50% of anchovies’ present range, including complete loss of aerobic habitat—and thus likely extirpation—from the southern CCS. Aerobic habitat loss will vary widely across the traits of CCS taxa, disrupting ecological interactions throughout the region.

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