FIGURE 8 in Benthic Heterobranch Sea Slugs (Gastropoda: Heterobranchia) from Santa Barbara County, California

FIGURE 8. Change in relative prevalence of southern species of heterobranchs at Naples Point, with yearly mean of the Multivariate ENSO Index, 2006–19. Relative prevalence of southern species calculated as the proportion of southern species found each sample month out of the total number of southern species (n = 35) found throughout the entire study, minus the same proportion calculated each month for northern species. These monthly values were then averaged by year. Values shown are means ± 1 SE.