Does Metamorphosis Increase the Susceptibility of Frogs to Highly Hydrophobic Contaminants?

Citation data:

Environmental Science & Technology, ISSN: 0013-936X, Vol: 40, Issue: 5, Page: 1491-1496

Publication Year:
2006
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Citations 16
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Repository URL:
https://scholar.uwindsor.ca/biologypub/690
DOI:
10.1021/es0515506
Author(s):
Jocelyn L. Leney; Ken G. Drouillard; G. Douglas Haffner
Publisher(s):
American Chemical Society (ACS)
Tags:
Environmental Science; Biology; Life Sciences
article description
The purpose of this study was to determine whether the process of metamorphosis in amphibians increases the chemical activity of hydrophobic contaminants such as polychlorinated biphenyls (PCBs). We conducted an experiment in which green frog tadpoles were orally dosed with a PCB mixture; then placed into clean water to eliminate the chemicals as metamorphosis occurred. On several sampling dates before and during metamorphosis, organisms were sacrificed and analyzed to determine lipid contents and concentrations of individual PCB congeners. The majority of the PCBs studied in this experiment showed increases in chemical activity (fugacity) as a result of the physical changes that occurred during amphibian metamorphosis. A positive relationship was observed between PCB hydrophobicity and the magnitude of the fugacity increase. We determined that the fugacity of a persistent PCB congener will increase during green frog metamorphosis if its log K value is greater than 5.85. The fugacity of some of the more highly hydrophobic PCBs increased during metamorphosis by up to a factor of 4. Because of the rapid increases in chemical activity that were observed during metamorphosis, we conclude that toxicity tests involving hydrophobic organic contaminants should be conducted not only on tadpoles or adult frogs, but also on metamorphosing amphibians. © 2006 American Chemical Society.