Species Regional Summary
Sargassum horneri
Northern California to Mid Channel Islands ( NEP-V )

Invasion

Invasion Description

1st Record: Intake Pipes at a rocky point north of Big Fisherman Cove near the University of Southern California’s Wrigley Marine Science Center and the town ofTwo Harbors, Santa Catalina Island /CA/Pacific Ocean (4/8/2006, Miller et al. 2007, 33
26¢N,118
29¢W,), 1st Record: Oxnard/CA/Port Hueneme (2011, California Department of Fish and Wildlife 2014), 1st Record: Anacapa Island/CA/Pacific Ocean (6/1/2010, Marks et al. 2015); Santa Barbara Island/CA/Pacific Ocean /1/2010, Marks et al. 2015)

Geographic Extent

Intake Pipes at a rocky point north of Big Fisherman Cove near the University of Southern California’s Wrigley Marine Science Center and the town ofTwo Harbors, Santa Catalina Island /CA/Pacific Ocean (4/8/2006, Miller et al. 2007, 33
26¢N,118
29¢W,); Cherry Cove, Santa Catalina Island /CA/Pacific Ocean (4/21/2006, Miller et al. 2007); Emerald Bay, Santa Catalina Island/CA/Pacific Ocean (4/24/2006, Miller et al. 2007); Emerald Bay, Santa Catalina Island/CA/Avalon Harbor (2011, California Department of Fish and Wildlife 2014); San Clemente Island/CA/Pacific Ocean (2007, Kaplanis et al. 2016; 9/17/2009, Marks et al. 2015); Blue Cavern Onshore State Marine Conservation Area, Santa Catlaina Island/CA/Sotuhern California Bight (Looby and Ginsburg 2021), Oxnard/CA/Port Hueneme (2011, California Department of Fish and Wildlife 2014), 1st Record: Anacapa Island/CA/Pacific Ocean (2009; 6/1/2010, Marks et al. 2015; Caselle et al. 2017); Kaplanis et al. 2016); Santa Barbara Island/CA/Pacific Ocean /1/2010, Marks et al. 2015; Kaplanis et al. 2016) Twin Harbor, Santa Cruz Island/CA/Pacific Ocean (2009, Marks et al. 2015); Santa Cruz Island/CA/Pacific Ocean (6/1/2010, Marks et al. 2015; Kaplanis et al. 2016)