Oxygen in the Southern California Bight: Multidecadal trends and implications for demersal fisheries
Open accessAbstract
Reports of hypoxic conditions (oxygen <1.5 ml L−1) off the U.S. west coast over the last two decades led us to investigate hypoxia in the Southern California Bight (SCB) and its potential impacts on fisheries. The secular trend in hypoxia in the SCB over the last 57 years is not monotonic, and reversed trend in the mid‐1980s, bringing oxygen concentrations back to levels measured in the late 1950s to early 1960s. Thirty‐seven percent of the rockfish (Sebastes spp.) habitat in the Cowcod Conservation Area at 240–350 m depths suffers exposure to hypoxia in the summer of normal years. If current trends in shoaling of low oxygen water continue for another 20 years, rather than reversing as happened previously, we predict loss of 18% of the habitat with 55% of the total habitat exposed to hypoxia.
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A long-term trend toward declining oxygen content in the southern California Current has been observed, with the hypoxic boundary (60 uM/kg) shoaling by up to 80 m over 1984-2006 in the Southern California Bight.
“A long-term trend toward declining oxygen content in the southern California Current has been observed, with the hypoxic boundary (defined as the depth at which dissolved oxygen is 60 uM/kg) shoaling by up to 80 m over the period 1984-2006 in the Southern California Bight [55,56].”
From Anticipated Effects of Climate Change on Coastal Upwelling Ecosystems (2015) · cites this paper as [56]
Section 3.1, paragraphs [12–13], reports declining oxygen and a shoaling hypoxic zone in recent decades. It recounts Bograd et al.’s finding of up to 80 m of shoaling, but this paper’s own estimate is 65 m inshore. The paper defines hypoxia using 1.5 ml L−1, not the claimed 60 µM/kg boundary, and its time series ends in 2007 rather than 2006. (LLM, conf=0.88)
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Research works printed but not linked: 4
- Bograd, S. J., C. G. Castro, E. Di Lorenzo, D. M. Palacios, H. Bailey, W. Gilly, and F. P. Chavez (2008), Oxygen declines and the shoaling of the hypoxic boundary in the California Current, Geophys. Res. Lett., 35, L12607, doi:10.1029/2008GL034185. · DOI · Paper page
- Gunderson, D., and R. Vetter (2006), Temperate rocky reef fishes, in Marine Metapopulations, edited by P. Sale and J. Kritzer, pp. 69-117, Elsevier, Amsterdam.
- Stramma, L., S. Schmidtkoa, L. Levin, and G. Johnson (2010), Ocean oxygen minima expansions and their biological impacts, Deep Sea Res., Part I, 57(4), 587-595.
- Vaquer-Sunyer, R., and C. Duarte (2008), Thresholds of hypoxia for marine biodiversity, Proc. Natl. Acad. Sci. U. S. A., 105(40), 15,452-15,457.
Cited by
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Climate change impacts on marine ecosystems
Doney, S. C., Ruckelshaus, M., Emmett Duffy, J., Barry, J. P., Chan, F., English, C. A., Galindo, H. M., Grebmeier, J. M., Hollowed, A. B., Knowlton, N., et al. (2012) · Annual Review of Marine Science · doi:10.1146/annurev-marine-041911-111611 · Cited by 3,014 · see citing works
Anticipated Effects of Climate Change on Coastal Upwelling Ecosystems
Bakun, A., Black, B. A., Bograd, S. J., García-Reyes, M., Miller, A. J., Rykaczewski, R. R., & Sydeman, W. J. (2015) · Current Climate Change Reports · doi:10.1007/s40641-015-0008-4 · Cited by 470 · see citing works
Ecology of the ocean sunfish, Mola mola, in the southern California Current system
Thys, T. M., Ryan, J. P., Dewar, H., Perle, C. R., Lyons, K., O'Sullivan, J., Farwell, C., Howard, M. J., Weng, K. C., Lavaniegos, B. E., et al. (2015) · Journal of Experimental Marine Biology and Ecology · doi:10.1016/j.jembe.2015.05.005 · Cited by 58 · see citing works
- Authors
- McClatchie, S., Goericke, R., Cosgrove, R., Auad, G., & Vetter, R.
- Affiliations
- NOAA National Marine Fisheries Service Southwest Fisheries Science Center (US)
- Scripps Institution of Oceanography (US)
- United States Department of the Interior (US)
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2010-10
- Volume
- 37
- Issue
- 19
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1898931013
- Cited by
- 137
- References
- 0
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 5 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 7 · 2019: 5 · 2018: 6 · 2017: 13 · 2016: 11 · 2015: 16 · 2014: 11 · 2013: 21 · 2012: 12
- FWCI
- 12.96
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- Funders
- National Oceanic and Atmospheric Administration
- National Marine Fisheries Service
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Keywords
- hypoxia, ocean deoxygenation, Southern California Bight, multi-decadal trends, Sebastes, demersal fisheries, habitat loss, fisheries impacts
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