Figure 3

tDDT levels in the blubber of male California sea lions stranded in California between 1970 and 2000. Mean values are presented. Blubber samples with a lipid content of less than 20% are excluded. Data are from 2000 (present study n = 20), as well as from 1990 (1988–1992, average = 1990 n = 7) [21] and 1970 (n = 20) [19]. Individual data and SD from the study of 1990 were not available.