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Severe storm disturbances and reversal of community structure in a southern California kelp forest

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Abstract

Regular observations made over a period of 5 yr in four permanent transects provided data on plant, sea urchin, and fish densities which indicate that two unusually severe winter storms in 1980 (“Storm I”) and 1983 (“Storm II”) had different effects on a southern California kelp-forest community. Storm I removed all canopies of the giant kelp Macrocystis pyrifera, but spared most understory kelps, mainly Pterygophora californica. Hence, the previously large accumulation of detached drift kelp, mostly M. pyrifera, disappeared. Denied their preferred diet of drift kelp, the sea urchins Strongylocentrotus franciscanus and S. purpuratus then emerged from shelters to find alternative food. Without effective predators, they consumed most living plants, including the surviving understory kelps. This weakened the important detritus-based food chain, as indicated indirectly by declining abundances of algal turf and fish (Embiotocidae) that eat small animals living in turf. In 1983, Storm II reversed the process by eliminating exposed urchins, while clearing rock surfaces for widespread kelp settlement and growth. By summer 1984, the kelp grew to maturity to form extensive canopies despite elevated water temperatures during summer and fall of 1983. Thus, severe storms may have vastly different effects on community structure, depending on the state of the community before the disturbance.

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Authors and Affiliations

  1. Department of Biological Sciences and Marine Science Institute, University of California at Santa Barbara, 93106, Santa Barbara, California, USA

    A. W. Ebeling, D. R. Laur & R. J. Rowley

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  1. A. W. Ebeling
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  2. D. R. Laur
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  3. R. J. Rowley
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Communicated by N. D. Holland, La Jolla

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Ebeling, A.W., Laur, D.R. & Rowley, R.J. Severe storm disturbances and reversal of community structure in a southern California kelp forest. Mar. Biol. 84, 287–294 (1985). https://doi.org/10.1007/BF00392498

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