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  1. No Access

    Article

    Effects of Lead (Pb) from Smelter Operations in an Urban Terrestrial Food Chain at a Colorado Superfund Site

    Lead (Pb) is ubiquitous in urban environments, and it is a risk factor for wildlife. But wildlife are particularly at risk for exposure near smelters in urban areas where higher than safe Pb levels in the soil...

    Elizabeth K. Peterson, James Carsella… in Bulletin of Environmental Contamination an… (2023)

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    Article

    Explaining variation in Colorado songbird blood mercury using migratory behavior, foraging guild, and diet

    Methylmercury is a contaminant of growing global concern that has been shown to accumulate in a variety of taxa, including songbirds. Birds in the same area can accumulate mercury to strikingly different level...

    Carley J. Knutsen, Claire W. Varian-Ramos in Ecotoxicology (2020)

  3. No Access

    Article

    Sexually selected traits as bioindicators: exposure to mercury affects carotenoid-based male bill color in zebra finches

    To examine whether sexually selected traits are particularly sensitive bioindicators of environmental toxicants, we assessed the effects of exposure to environmentally relevant dietary concentrations of the po...

    Jessica L. Spickler, John P. Swaddle, Rebecca L. Gilson… in Ecotoxicology (2020)

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    Article

    Mercury delays cerebellar development in a model songbird species, the zebra finch

    Mercury exposure can disrupt development of the cerebellum, part of the brain essential for coordination of movement through a complex environment, including flight. In precocial birds, such as fowl, the cereb...

    Sheila A. Scoville, Claire W. Varian-Ramos, G. Alden Adkins… in Ecotoxicology (2020)

  5. No Access

    Article

    Exposure to Lead (Pb2+) Eliminates Avoidance of Pb-Treated Oviposition Substrates in a Dose-Dependent Manner in Female Vinegar Flies

    Female vinegar flies (Drosophila melanogaster) preferentially oviposit eggs on oviposition substrates that decrease larval foraging costs. We tested whether female D. melanogaster would avoid oviposition substrat...

    Elizabeth K. Peterson, Austin Stark… in Bulletin of Environmental Contamination an… (2020)

  6. No Access

    Article

    Form of Dietary Methylmercury does not Affect Total Mercury Accumulation in the Tissues of Zebra Finch

    Exposure to mercury in humans, other mammals, and birds is primarily dietary, with mercury in the methylated form and bound to cysteine in the tissues of prey items. Yet dosing studies are generally carried ou...

    Claire W. Varian-Ramos, Margaret Whitney… in Bulletin of Environmental Contamination an… (2017)

  7. No Access

    Article

    PHA-Stimulated Immune-Responsiveness in Mercury-Dosed Zebra Finches Does Not Match Results from Environmentally Exposed Songbirds

    Dietary mercury exposure is associated with suppressed immune responsiveness in birds. This study examined the immune-responsiveness of domestic zebra finches (Taeniopygia guttata) experimentally exposed to mercu...

    Mitchell T. Caudill, Eliza L. Spear… in Bulletin of Environmental Contamination an… (2015)

  8. No Access

    Article

    Oxidative stress in songbirds exposed to dietary methylmercury

    Long-term, sublethal methylmercury exposure can cause reproductive depression, immune suppression, endocrine disruption and other problems in birds. We used two biomarkers to detect oxidative stress in livers ...

    Katie A. Henry, Daniel A. Cristol, Claire W. Varian-Ramos, Eric L. Bradley in Ecotoxicology (2015)

  9. No Access

    Article

    The Effect of Mercury on Baseline Corticosterone in a Breeding Songbird

    Although songbirds accumulate mercury at rates equivalent to better-studied aquatic avian species, effects of mercury bioaccumulation in songbirds remain understudied. Little is known about the effects of mer...

    Sarah L. Maddux, Daniel A. Cristol… in Bulletin of Environmental Contamination an… (2015)

  10. No Access

    Article

    Decreased Immune Response in Zebra Finches Exposed to Sublethal Doses of Mercury

    Mercury (Hg) is a ubiquitous contaminant with deleterious effects on many wildlife species. Most studies to date have focused on fish-eating birds and mammals because much historical Hg pollution is aquatic. R...

    Catherine A. Lewis, Daniel A. Cristol… in Archives of Environmental Contamination an… (2013)

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    Article

    Mercury levels of Nelson’s and saltmarsh sparrows at wintering grounds in Virginia, USA

    Nelson’s and saltmarsh sparrows (Ammodramus nelsoni and A. caudacutus) have recently been recognized as separate species, and because of their limited distributions and the susceptibility of their wetland habitat...

    Daniel A. Cristol, Fletcher M. Smith, Claire W. Varian-Ramos… in Ecotoxicology (2011)

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    Article

    Stability of Mercury Concentrations in Frozen Avian Blood Samples

    It is unclear whether mercury concentration in wildlife tissues changes appreciably after lengthy frozen storage. To test whether such freezer-archived samples are stable, small (~10–50 μL) avian blood samples...

    Claire W. Varian-Ramos, Anne M. Condon… in Bulletin of Environmental Contamination an… (2011)

  13. No Access

    Article

    Offspring sex ratios reflect lack of repayment by auxiliary males in a cooperatively breeding passerine

    The repayment hypothesis posits that primary sex ratios in cooperative species should be biased towards the hel** sex because these offspring “repay” a portion of their cost through hel** behavior and ther...

    Claire W. Varian-Ramos, Jordan Karubian… in Behavioral Ecology and Sociobiology (2010)