Mineralization of Clapper Rail Eggshell from a Contaminated Salt Marsh System

Rodríguez‐Navarro, Alejandro B.; Gaines, Karen F.; Romanek, Christopher S.; Masson, G.

doi:10.1007/s00244-002-0266-8

Cited by 25 publications

(33 citation statements)

References 36 publications

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“…During the breeding season of 2000, nest searches were conducted at LCP and Blythe Island to collect eggs for eggshell integrity and chick studies (Rodriguez-Navarro et al 2002. The eggs collected directly correspond to the home ranges used in this 2002 study, as this study was designed to spatially match/overlap the locations where eggs were collected from the 2000 study.…”

Section: Collection Of Eggs and Chicksmentioning

confidence: 99%

“…Rail chicks hatched from the eggs from the LCP marsh in this study have been shown to have both behavioral and physical abnormalities (Novak et al 2006), as well as bone structural problems (RodriguezNavarro et al 2006). Moreover, eggs that did not hatch or were archived (not allowed to hatch) also demonstrated egg shell integrity problems (Rodriguez-Navarro et al 2002). These endpoints were linked to the toxicant mixtures that were passed in ovo.…”

Section: Home Rangementioning

confidence: 99%

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Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

et al. 2008

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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 Abstract 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.

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Section: Collection Of Eggs and Chicksmentioning

confidence: 99%

Section: Home Rangementioning

confidence: 99%

Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

et al. 2008

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“…This could be due to a reduction in the rate of bone turnover caused by contaminants resulting in a higher amount of mature bone mineral relative to newer bone mineral. Also, a reduction in bone remodeling would reduce the availability of Ca for eggshell formation explaining the eggshell thinning observed in previous studies (24). Other authors (9,10) have also associated an alteration of bone remodeling to PCBs exposure.…”

Section: Discussionmentioning

confidence: 84%

Effect of In Ovo Exposure to PCBs and Hg on Clapper Rail Bone Mineral Chemistry from a Contaminated Salt Marsh in Coastal Georgia

Rodríguez‐Navarro

Romanek

Álvarez‐Lloret

et al. 2006

Environ. Sci. Technol.

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The effect of Hg and PCBs (Aroclor 1268) on bone characteristics was investigated in a population of Clapper Rails (Rallus longirostris) inhabiting contaminated and unimpacted estuarine marsh systems in coastal Georgia. Exposure to contaminants did not affect the length or weight of leg bones, but it significantly altered the chemical composition of the bone. Specifically, bone in the contaminated site had a higher Ca to P, and lower carbonate and acid phosphate content. These characteristics are typical of more mature bone mineral and indicate that toxicants have accelerated bone maturation. FTIR spectroscopy data revealed a dose dependent change in the crystallinity of bone mineral, and the relative proportion of specific PO 4 groups in different molecular environments in the bone, with toxicants loads. These changes are most probably related to a hormonal alteration of the rate of bone remodelation induced by exposure to toxicant loads.

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“…Clean-up plans often consider action levels to minimize chronic toxic effects, but fail to regard the broader impacts of long-term exposure to populations. The Clapper Rail population in this study has been used as an indicator population for acute effects (Cumbee et al 2008;Novak et al 2006;Rodriguez-Navarro et al 2002. However, the long-term consequences of this perturbation have not been examined.…”

Section: Introductionmentioning

confidence: 99%

“…All work summarized below has been performed post-mitigation in areas that were never physically disturbed by clean-up efforts. Studies performed post-mitigation have found that the Aroclor 1268 mixture is still present in the sediment throughout the marshes associated with LCP, has gone through little physical or chemical weathering, and is highly bioavailable (Cumbee et al 2008;Novak et al 2006;Rodriguez-Navarro et al 2002. Gaines et al (1999Gaines et al ( , 2000 assisted the US Fish and Wildlife Service (USFWS) to document the extent of the post-mitigation damage to wildlife resources, using Clapper Rails as an indicator of ecosystem health.…”

Section: Introductionmentioning

confidence: 99%

Is the LCP Superfund Site an Ecological Trap for Clapper Rails?

Gaines

Summers

Cumbee

et al. 2011

Southeastern Naturalist

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-Rallus longirostris (Clapper Rail) is considered a good indicator species for toxicants because of its strong site fi delity and predictable diet of benthic organisms. High levels of the rare PCB Aroclor 1268 have been found in Clapper Rail adults, chicks, and eggs from the marshes associated with the Linden Chemical Plant (LCP) in Brunswick, GA. Recently, sampling and testing feathers has successfully been used as a non-lethal tool to trace exposure and assimilation of Aroclor 1268 in rails from the LCP site. This approach allows us to infer how and when these birds are exposed to contaminants in the marsh due to predictable molting patterns coupled with the fact that a feather will accumulate the toxicant only at the time it is grown. This study is the start of a process to investigate the possibility that this ecosystem contamination is the foundation of an ecological trap for Clapper Rails at the LCP site. Aroclor 1268 was isolated in Clapper Rail feathers from all birds collected from the contaminated marsh. This fi nding suggests that these birds either hatched or resided in this system the previous year and thus were not new recruits, which would be expected if fi tness was being compromised from the contamination. Based on samples taken during the same fall and winter from the LCP site and control areas, the ratios of hatch-year (HY) birds to adults were similar. However, based on samples taken during the spring and summer, the ratios of HY birds to adults from LCP were lower than reported previously in studies in the southeast. This result suggests that the population age structure may have been affected by the contamination. Future studies specifi cally focused on reproductive success and fi tness are needed at LCP and throughout the Brunswick estuary.

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Mineralization of Clapper Rail Eggshell from a Contaminated Salt Marsh System

Cited by 25 publications

References 36 publications

Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

Effect of In Ovo Exposure to PCBs and Hg on Clapper Rail Bone Mineral Chemistry from a Contaminated Salt Marsh in Coastal Georgia

Is the LCP Superfund Site an Ecological Trap for Clapper Rails?

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