The Monterey County Herald is reporting that there is a renewed volunteer effort to remove brown kelp (Undaria pinnatifida) from Monterey Bay. The Asian kelp was first seen in the Bay over five years ago, and volunteers were first enlisted to search for and manually remove it back in 2002. It sounds like the current plan is more about keeping the kelp from spreading even further, rather than attempting to reduce its range - the algae is now so abundant that there are fears it will spread from the Bay into the open ocean. This site provides more details of the management efforts.
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