Alan Kolok | Geology Reports

USGS2014

Featured collection introduction: contaminants of emerging concern II

This collection of 13 articles focuses on CECs, and each of the articles highlights a specific aspect of this broad topic. The articles were solicited from researchers who participated in the second summer specialty conference on this topic, organized by the American Water Resources Association. The title of the conference was “CECs in Water Resources II: Research, Engineering and Community Action,” and the conference, as well as the articles in this featured collection, focus on a better and more comprehensive understanding of these contaminants. The conference was held in Denver, Colorado, on June 25-27, 2012, and approximately 125 conference attendees participated in an interdisciplinary forum of more than 75 presentations including keynote or plenary presentations by Dana Kolpin, Jorg Drewes, Heiko Schoenfuss, Chris Metcalfe, Vicki Blazer, and Tyrone Hayes. The first conference was held in 2007 and also produced a featured collection of articles (Battaglin and Kolpin, 2009).

Journal of the American Water Resources Associatio↗

USGS1996

The role of water ventilation and sediment ingestion in the uptake of benzo[A]pyrene in gizzard shad ( Dorosoma cepedianum )

The objective of this study was to determine whether sediment ingestion or water ventilation was the primary route of uptake for benzo[ a ]pyrene (B a P) in the gizzard shad ( Dorosoma cepedianum ), a detritivorous fish. Two experiments were conducted in which fish were exposed to sediments spiked with 1 μg/g B a P. In the first experiment, fish were prevented from feeding by esophagus ligation. In the second experiment, 20 nonligated fish and 30 ligated fish were added to the aquarium. The nonligated fish roiled the water as they fed. Fish were collected 4, 8, 15, and 22 d after the experiments began. Gizzard shad metabolize B a P; therefore, the concentrations of B a P equivalents (parent B a P plus metabolite) were determined. Concentrations of B a P equivalents were significantly greater in the ligated fish in experiment 2 relative to those in experiment 1. In contrast, the concentration of B a P equivalents in the ligated fish in experiment 2 was not significantly different than that in the nonligated fish. Our results suggest that ventilation of turbid water may be a significant source of B a P for gizzard shad. Sediment ingestion, however, does not appear to significantly influence the total body concentration of B a P equivalents in gizzard shad.

Environmental Toxicology and Chemistry↗