A major threat to C. sitchensis in Southern California is deforestation and its effects on the giant kelp forests around the Channel Islands National Park.
He authored legislation which created the Channel Islands National Park, the Dick Smith Wilderness Area, the Los Padres National Forest, and co-authored the Drug War Bond Act and the Violent Crime and Drug Control Act.
Native wildlife populations on the islands, both part of Channel Islands National Park, had been pushed toward extinction by a variety of invasive species, including the golden eagle, black rats, and feral pigs and sheep.
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