BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-11-1053-2014 Exploring local adaptation and the ocean acidification seascape – studies in the California Current Large Marine Ecosystem Hofmann G. E. 1 3 Evans T. G. 2 Kelly M. W. 1 11 Padilla-Gamiño J. L. 1 Blanchette C. A. 3 Washburn L. 3 4 Chan F. 5 McManus M. A. 6 Menge B. A. 5 Gaylord B. 7 8 Hill T. M. 7 9 Sanford E. 7 8 LaVigne M. 7 9 10 Rose J. M. 5 Kapsenberg L. 1 Dutton J. M. 1 Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106-9620, USA Department of Biological Sciences, California State University East Bay, Hayward, CA 94542, USA Marine Science Institute, University of California Santa Barbara, Santa Barbara, CA 93106-6150, USA Department of Geography, University of California Santa Barbara, Santa Barbara, CA 93106-4060, USA Department of Zoology, Oregon State University, Corvallis, OR 97331-2914, USA Department of Oceanography, University of Hawaii at Manoa, Honolulu, HI 96822, USA Bodega Marine Laboratory, University of California Davis, Bodega Bay, CA 94923, USA Department of Evolution and Ecology, University of California Davis, Davis, CA 95616, USA Department of Geology, University of California Davis, Davis, CA 95616, USA Department of Earth and Oceanographic Sciences, Bowdoin College, Brunswick, ME 04011, USA current address: Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA 24 02 2014 11 4 1053 1064 Copyright: © 2014 G. E. Hofmann et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/11/1053/2014/bg-11-1053-2014.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/11/1053/2014/bg-11-1053-2014.pdf

The California Current Large Marine Ecosystem (CCLME), a temperate marine region dominated by episodic upwelling, is predicted to experience rapid environmental change in the future due to ocean acidification. The aragonite saturation state within the California Current System is predicted to decrease in the future with near-permanent undersaturation conditions expected by the year 2050. Thus, the CCLME is a critical region to study due to the rapid rate of environmental change that resident organisms will experience and because of the economic and societal value of this coastal region. Recent efforts by a research consortium – the Ocean Margin Ecosystems Group for Acidification Studies (OMEGAS) – has begun to characterize a portion of the CCLME; both describing the spatial mosaic of pH in coastal waters and examining the responses of key calcification-dependent benthic marine organisms to natural variation in pH and to changes in carbonate chemistry that are expected in the coming decades. In this review, we present the OMEGAS strategy of co-locating sensors and oceanographic observations with biological studies on benthic marine invertebrates, specifically measurements of functional traits such as calcification-related processes and genetic variation in populations that are locally adapted to conditions in a particular region of the coast. Highlighted in this contribution are (1) the OMEGAS sensor network that spans the west coast of the US from central Oregon to southern California, (2) initial findings of the carbonate chemistry amongst the OMEGAS study sites, and (3) an overview of the biological data that describes the acclimatization and the adaptation capacity of key benthic marine invertebrates within the CCLME.

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