Open space, not reduced herbivory, facilitates invasion of a marine macroalga, implying it is a disturbance-mediated “passenger” of change

Sargassum horneri, a brown macroalga, recently invaded the California coast, including into critical foundational communities such as kelp (Macrocystis pyrifera) forests. Despite its rapid spread, empirical tests that evaluate mechanisms underlying S. horneri's invasion success are lacking. To...

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