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Research Technical Report

An Integrated Response to a New Coastal Invasion: Monitoring and Managing Undaria pinnatifida in Monterey Bay

Lonhart, S.I., M. Carr, M. Fuller, M. Graham, S. Pryor, C. Syms, R. Walsh, and K. Wasson (March 2003)

Poster presentation at the Sanctuary Currents Symposium, Seaside, CA


The Asian kelp Undaria pinnatifida, recognized as a marine threat because of its record of rapid spread and high abundance in invaded regions elsewhere, was first reported in 2001 from a site in the Monterey Bay region, California. Already widespread in other parts of the world, Undaria has recently appeared in various southern California harbors from Los Angeles to Santa Barbara. Because of its rapid population growth, high density, canopy-forming growth form and potential availability as a source of food and habitat for invertebrates, Undaria could have profound influences on the structure and function of our highly productive and species-rich coastal reef ecosystems. The population reported from Monterey Harbor is the northern-most known occurrence of the alga along coastal California. Regional agencies and researchers are collaborating to study: 1) the spatial extent of the invasion, 2) habitat associations, 3) seasonal dynamics of growth and reproduction, and 4) the costs/benefits of different potential eradication methods. This effort is also being used to create a regional management structure and decision-making process for rapid response to future coastal invasions.

Reviewed: April 11, 2024
Web Site Owner: National Ocean Service

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