Clapper rails (Rallus longirostris) were used as an indicator species of estuarine marsh habitat quality because of their strong site ﬁdelity and predictable diet consisting of mostly benthic organisms. Mercury (Hg) and the polychlorinated biphenyl (PCB) Aroclor 1268 concentrations were determined for sediments, crabs, as well as clapper rail adults and chicks collected from salt marshes associated with the LCP Superfund site in Brunswick, Georgia. Home ranges were established for adult rails, and sediment and crab samples were taken from each individual’s range. The study was designed to minimize the spatial variability associated with trophic transfer studies by choosing an endpoint species with a potentially small home range and speciﬁcally sampling its foraging range. The mean home range for clapper rails was 1.2 ha with a median of 0.28 ha. Concentrations of Hg and Aroclor 1268 were shown to increase with each trophic level. Transfer factors between media followed the same pattern for both contaminants with the highest between ﬁddler crabs and clapper rail liver. Hg and PCB transfer factors were similar between sediment to ﬁddler crab and ﬁddler crab to muscle, however the PCB transfer factor from ﬁddler crabs to liver was over twice as large as for Hg. PCB congener proﬁles did not signiﬁcantly differ between media types.
Cumbee, James C. Jr.; Gaines, Karen F.; Mills, Gary L.; Garvin, N.; Stephens, Warren L. Jr.; Novak, James N.; and Brisbin, I. L. Jr., "Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system" (2008). Faculty Research & Creative Activity. Paper 43.