Dear colleagues, My co-authors and I are pleased to announce our new publication: Citation: Peterson, S.H., J.T. Ackerman, D.E. Crocker, D.P. Costa. 2018. Foraging and fasting can influence contaminant concentrations in animals: an example with mercury contamination in a free-ranging marine mammal. Proceedings of the Royal Society B. 285 20172782 DOI: 10.1098/rspb.2017.2782 Abstract: Large fluctuations in animal body mass in relation to life-history events can influence contaminant concentrations and toxicological risk. We quantified mercury concentrations in adult northern elephant seals (*Mirounga angustirostris*) before and after lengthy at sea foraging trips (*n* = 89) or fasting periods on land (*n* = 27), and showed that mercury concentrations in blood and muscle changed in response to these events. The highest blood mercury concentrations were observed after the breeding fast, whereas the highest muscle mercury concentrations were observed when seals returned to land to moult. Mean female blood mercury concentrations decreased by 30% across each of the two annual foraging trips, demonstrating a foraging-associated dilution of mercury concentrations as seals gained mass. Blood mercury concentrations increased by 103% and 24% across the breeding and moulting fasts, respectively, demonstrating a fasting-associated concentration of mercury as seals lost mass. In contrast to blood, mercury concentrations in female's muscle increased by 19% during the post-breeding foraging trip and did not change during the post-moulting foraging trip. While fasting, female muscle mercury concentrations increased 26% during breeding, but decreased 14% during moulting. Consequently, regardless of exposure, an animal's contaminant concentration can be markedly influenced by their annual life-history events. If you have access, the paper is available here: http://rspb. royalsocietypublishing.org/content/285/1872/20172782 If you do not have access, please let me know if you would like a copy of the paper and I will send it along with the supplementary materials. Best regards, Sarah -- Sarah Peterson, PhD Wildlife Biologist