Figure 2.

(a) FT4 and (b) TT3 measured from serum of dolphins sampled near Sarasota, FL; Beaufort, NC; Sapelo Island, GA and Brunswick, GA. Bars represent mean and whiskers represent 95% CI. Sample size (n) is indicated below x-axis. FT4 differed (p = 0.002) between the Georgia sites (Sapelo and Brunswick) and the two reference sites (Sarasota and Beaufort); TT3 was slightly above the critical value (p = 0.053). (a,b) Black bars, Sarasota; dark grey bars, Beaufort; light grey bars, Sapelo; white bars, Brunswick.