About the Data

Species records include data on invasions history, distribution, ecology, impact, and more. These data were gathered from published literature and targeted surveys. All records have undergone expert review, unless otherwise noted.

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Species Profiles

NEMESIS includes detailed information on about 500 species of marine and estuarine of invertebrates and algae introduced to the United States. Each record contains information on taxonomy, distribution, ecology, and impacts, as well as references.

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Daily Invader

Acartiella sinensis

Acartiella sinensis

Acartiella sinensis is a planktonic calanoid copepod. It is native to estuaries in Southeastern China, Thailand and Sri Lanka. It is associated with warm, low-salinity waters and has been recorded in ballast water aboard commercial vessels arriving on the US West Coast. It is established in San Francisco Bay, California and individuals have been found in the Columbia River, Oregon, but a population is not known to be established there. It is abundant in San Francisco, but the extent to which it has had any impacts on native species or foodwebs, if any, is unknown.

Daily Invader for 2024-05-16

Image Credit Toni Ignoffo, Kimmerer Lab, Romberg Tiburon Center, San Francisco State University
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