Fig. 5.

Mean number (+SE) of a individuals and b species of nudibranchs found at Duxbury Reef during 1969–1975 (n = 7 counts) and 2007–2009 (n = 5 counts), grouped by species vulnerability to predation by P. hiltoni as outlined in “Materials and methods”. Key: gray, not vulnerable; black, vulnerable. Asterisks (*) indicate pairs of values for the different time periods significantly different at P < 0.05 by a one-tailed t-test assuming unequal variances