nMDS plot displaying differences in community composition between the 1994–2000 surveys and the 2019–2020 survey. The sites used for comparison, and their corresponding abbreviations, are consistent with the 1994–2000 survey. The following sites and abbreviations are used: Santa Barbara Harbor (SBH), Ventura Harbor Entrance (VHE), Ventura Harbor Pierpont Yacht Club (VHYC), Port Hueneme Entrance (PHE), Port Hueneme Anacapa Island Marina (PHA), King Harbor (KH), Marina Del Rey (MDR), LA Harbor Watchorn Marina (LAW), Long Beach Impound Marina (LBI), Alamitos Bay Entrance (ABE), Newport Harbor Inner Harbor (NH1), Newport Harbor Lido Peninsula (NH2), Newport Harbor Upper Bay (NH3), Dana Point Harbor (DPH), Oceanside North Harbor (ON), Mission Bay Seaforth Landing (MB1), Mission Bay Dana Landing (MB2), Mission Bay South Shores Boat Ramp (MB3), Mission Bay Bahia Point (MB4), Mission Bay Yacht Club (MB5), Mission Bay Santa Clara Boat Launch (MB6), San Diego Bay 24th Street National City (SD1), San Diego Bay J Street Chula Vista (SD2), San Diego Bay Fiddlers Cove (SD3), San Diego Bay Harbor Island (SD4), and San Diego Bay Shelter Island (SD5). This plot includes the species recorded in both surveys, across all sites. Group 1, the blue triangles, represents the abundances from the 2019–2020 survey, with each point representing a specific site. The red triangles represent the abundances recorded at the sites from the 1994–2000 survey. The plot shows clustering of each group with slight overlap, indicating that many of the sites within each group are closer in abundance to each other than they are to the other group.