∑PCB concentrations in northern elephant seals (N = 58).

<p>∑PCB concentrations are lipid-normalized (ng g⁻¹ lipid) for inner blubber, outer blubber and serum. Serum ∑PCB concentrations are also reported by wet weight (µg L⁻¹). Samples were collected at four different times of year (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0096191#pone-0096191-g001" target="_blank">Fig. 1</a>) from 2005–2007.</p><p>Note. A subset of animals with known ages and body composition measurements were used for statistical analyses (sample sizes in parentheses). Late breeding (1A) – early molt (1B) samples were taken before and after the short foraging trip and late molt (2A) – early breeding (2B) samples were taken before and after the long trip. Numbers of paired samples (same seal) are given for each tissue type because not all seals were repeatedly sampled. Some seals were sampled twice while other seals were only sampled once.