Liver Metal Concentrations in Greater Sage-grouse (Centrocercus urophasianus)

Dailey, Rebecca N.; Raisbeck, Merl F.; Siemion, R.; Cornish, Todd E.

doi:10.7589/0090-3558-44.2.494

Cited by 8 publications

(9 citation statements)

References 16 publications

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“…Age is one of the main factors explaining Cd accumulation, as observed in waterfowl from southern Spain (Gómez et al 2004). With continued exposure, even at low levels, Cd is accumulated throughout the life span of birds (Dailey et al 2008). The lower Cd concentration in the feathers of adults compared to young birds could be a consequence of the balance between elemental uptake during the feather's formation and elemental removal during the moult (Lewis and Furness 1991).…”

Section: Trace Element Distribution and Toxicity Significancementioning

confidence: 99%

Evidence of species-specific detoxification processes for trace elements in shorebirds

et al. 2012

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This study investigated sub-lethal effects and detoxification processes activated in free-ranging Red Knots (RKs) (Calidris canutus) from the Pertuis Charentais on the Atlantic coast of France, and compared the results with previous data obtained on another shorebird species, the Black-tailed Godwit (Limosa limosa). The concentrations of 13 trace elements (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Zn) were assessed in the liver, kidneys, muscle and feathers. Stable isotope analyses of carbon and nitrogen were carried out to determine whether differences in diet explained variations in elemental uptake. The mRNA expression of relevant genes (cytochrome c oxidase 1, acetyl-CoA carboxylase, Cu/Zn and Mn superoxide dismutase, catalase, metallothionein, malic enzyme), antioxidant enzyme activities (catalase, glutathione peroxidase (GPx), superoxide dismutase), and metallothionein (MT) levels were investigated to shed light on trace element detoxification and toxic effects. Although Red Knots were characterized by elevated As and Se concentrations which were potentially toxic, most elements were usually below toxicity threshold levels. The results strongly suggested a dietary specialization of Red Knots, with individuals feeding on higher trophic status prey experiencing higher As, Hg and Se burdens. Red Knots and Godwits also showed discrepancies in elemental accumulation and detoxification processes. Higher As and Se concentrations in Red Knots enhanced catalase gene expression and enzyme activity, while Godwits had higher Ag, Cu, Fe and Zn levels and showed higher MT production and GPx activity. The results strongly suggest that detoxification pathways are essentially trace element- and species-specific.

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Section: Trace Element Distribution and Toxicity Significancementioning

confidence: 99%

Evidence of species-specific detoxification processes for trace elements in shorebirds

et al. 2012

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“…We therefore used nonparametric Wilcoxon rank sums test (two-tailed; a = 0.05) to evaluate distributional differences in metal concentrations for each population (Roberts vs. Cortez). To evaluate differences in metal concentrations between Nevada, and Wyoming and Montana, we pooled data between our two study populations, and compared the mean values and associated confidence intervals of the pooled sample to values reported by Dailey et al (2008). We then considered estimates to differ significantly between Nevada, and Wyoming and Montana when 95% confidence intervals did not overlap between the two studies.…”

Section: Discussionmentioning

confidence: 99%

“…Researchers have documented metal toxicity as a result of human land use in numerous avian taxa (e.g., Taggart et al 2006), but investigations of heavy metal exposure in sage-grouse populations are not common (Dailey et al 2008). Adequately characterizing background contaminant levels for a range of locations and conditions is an important component of monitoring the potential impact of human land use on sage-grouse populations.…”

Section: Introductionmentioning

confidence: 99%

“…Sage-grouse occur in 11 western states and two Canadian provinces, and adequately characterizing background variation in potential contaminants requires sampling from across the species' range. However, the only published account of heavy metal concentrations for sage-grouse tissues to date was derived from samples collected throughout Wyoming and Montana (Dailey et al 2008). Our objective for this study was to report metal concentrations in livers of sage-grouse collected in Eureka County, Nevada (40u159N, 116u309E), to increase the availability of reference values.…”

Section: Introductionmentioning

confidence: 99%

“…Our study area contained two adjacent populations of sagegrouse separated by a distance of approximately 40 km, and we examined local variation in liver metal concentration between these two populations. We also compared these values to concentrations reported for Wyoming and Montana (Dailey et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Geographic Variation in Liver Metal Concentrations of Greater Sage-Grouse

Blomberg

Wolff

Sedinger

2013

Journal of Fish and Wildlife Management

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Populations of greater sage-grouse (Centrocercus urophasianus) have declined throughout the species' range. We evaluated metal concentrations in livers sampled from greater sage-grouse collected from hunters in Eureka County, Nevada, during autumn of 2008 and 2010. We make local comparisons of metal concentrations between two populations of greater sage-grouse in Eureka County, as well as regional comparisons with previously reported values for greater sage-grouse collected in Wyoming and Montana. With one exception, tissue concentrations of lead, arsenic, and mercury were below method detection limits. Mean concentrations of iron, molybdenum, and zinc differed between the two Nevada populations, and magnesium, cadmium, molybdenum, and selenium differed between greater sage-grouse in eastern Nevada, and values reported for Wyoming and Montana. In contrast, we found no evidence for local variation in magnesium, copper, cadmium, or selenium, or for regional variation in iron, zinc, or copper. Of particular interest were low selenium concentrations in our study system relative to Wyoming and Montana. Some individuals in our study returned liver selenium values considered consistent with selenium deficiency in domestic poultry. This research adds to the small body of literature on background contaminant levels in greater sage-grouse, and provides evidence for geographic variation in metal concentrations at local and regional scales.

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