Preliminary reports from the Caulerpa taxifolia invasion in southern California

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Abstract
We report the first preliminary in situ observa- tions of the invasive strain of the tropical green seaweed Caulerpa taxifolia in Huntington Harbor, California. Al- though patch size had regressed from the previous, presum- ably summer, extent, C. taxifolia exhibited new frond growth within patches despite low winter water temperature. The growth patterns, size of fronds, density, and biomass were similar to those reported from other invasion sites in the Mediterranean Sea and Australia. The seagrass Ruppia mar- itima also grew at the site. In patches mixed with C. taxifolia, the biomass of R. maritima was 20 times lower than in patches without C. taxifolia.

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