Influence of feeding ecology on blood mercury concentrations in four species of turtles

@article{Bergeron2007InfluenceOF,
  title={Influence of feeding ecology on blood mercury concentrations in four species of turtles},
  author={Christine M. Bergeron and Jerry F. Husak and Jason M. Unrine and Christopher S. Romanek and William A. Hopkins},
  journal={Environmental Toxicology and Chemistry},
  year={2007},
  volume={26}
}
Mercury is a relatively well‐studied pollutant because of its global distribution, toxicity, and ability to bioaccumulate and biomagnify in food webs; however, little is known about bioaccumulation and toxicity of Hg in turtles. Total Hg (THg) concentrations in blood were determined for 552 turtles representing four different species (Chelydra serpentina, Sternotherus odoratus, Chrysemys picta, and Pseudemys rubriventris) from a Hg‐contaminated site on the South River (VA, USA) and upstream… 
Nondestructive indices of mercury exposure in three species of turtles occupying different trophic niches downstream from a former chloralkali facility
TLDR
The results demonstrate that downstream transport of Hg from point sources can persist over vast expanses of river thereby posing potential exposure risks to turtles, but relative exposure varies with trophic level.
Mercury accumulation along a contamination gradient and nondestructive indices of bioaccumulation in amphibians
TLDR
The results suggest that amphibians and their terrestrial predators may be at risk of Hg exposure in this system and that nondestructive methods may be a viable sampling alternative that reduces impacts to local populations.
Bioaccumulation and maternal transfer of mercury and selenium in amphibians
TLDR
The present study is the first to confirm a correlation between Hg concentrations in female carcass and eggs in amphibians and among thefirst to describe co‐transference of Se and Hg in an anamniotic vertebrate.
INTER‐ AND INTRASPECIFIC VARIATION IN MERCURY BIOACCUMULATION BY SNAKES INHABITING A CONTAMINATED RIVER FLOODPLAIN
TLDR
Nitrogen stable isotope values indicated ontogenetic trophic shifts that correlated with THg bioaccumulation within watersnakes, suggesting that diet plays a substantial role in Hg exposure, and warrant further investigation of potential adverse effects.
Dietary Reliance on Benthic Primary Production as a Predictor of Mercury Accumulation in Freshwater Fish and Turtles
TLDR
Positive and significant relationship was found between Hg burden and dietary reliance on benthic primary production, animal length, trophic level, and species identity in fish and in turtles, and future attempts to model Hg accumulation in similar study systems and/or fish species should include dietary reliance in fish species as a predictor variable.
Environmental causes and reproductive correlates of mercury contamination in European pond turtles (Emys orbicularis).
Food preferences and Hg distribution in Chelonia mydas assessed by stable isotopes.
Mercury concentrations in snapping turtles (Chelydra serpentina) correlate with environmental and landscape characteristics
TLDR
It is demonstrated that THg concentrations in snapping turtles are spatially variable, frequently exceed advisory limits, and are significantly correlated with several landscape and water characteristics.
Food preferences and Hg distribution in Chelonia mydas assessed by stable isotopes
TLDR
The results suggest that juvenile foraging green turtles are exposed to Hg burdens from locally anthropogenic activities in coastal areas, and some juvenile green turtles from the highly industrialized foraging ground presented liver Hg levels among the highest ever reported for this species.
...
...

References

SHOWING 1-10 OF 58 REFERENCES
Dietary mercury exposure and bioaccumulation in southern leopard frog (Rana sphenocephala) larvae
TLDR
It is concluded that neither methylmercury nor inorganic Hg in aufwuchs is highly bioavailable to tadpoles and that bioaccumulation is not well explained by a simple partitioning model, which suggests that bio Accumulation factors as currently used are not the best predictors of dietary Hg bioAccumulation.
Mercury Concentrations in Tissues of Osprey From the Carolinas, USA
TLDR
It is suggested that most ospreys in this region are not currently at risk of Hg toxicosis, but it is recommended that additional ecotoxicological studies be performed to monitor risk to osprey in this coastal region facing heavy development.
Relationship between mercury levels and diet in Azores seabirds
TLDR
Findings show that the inclusion of mesopelagic prey in seabird diet has an influence on mercury accumulation over and above that from trophic status and emphasises further the value of seabirds feathers as monitors of the ecological hazards of mercury in marine ecosystems.
Mercury Concentrations in Bicknell’s Thrush and Other Insectivorous Passerines in Montane Forests of Northeastern North America
TLDR
The finding of a correlation between regional litterfall Hg flux patterns and Bicknell’s thrush blood Hg concentrations demonstrates on-site availability of MeHg, and is recommended to assess risk to insectivorous passerines, particularly the Bicarus bicknelli.
Comparison of two freshwater turtle species as monitors of radionuclide and chemical contamination: DNA Damage and residue analysis
Two species of turtles that occupy different ecological niches were compared for their usefulness as monitors of freshwater ecosystems where both low-level radioactive and nonradioactive contaminants
Dietary mercury exposure and bioaccumulation in amphibian larvae inhabiting Carolina bay wetlands.
Turtles as Monitors of Chemical Contaminants in the Environment
Biota have been used increasingly in recent years to evaluate the presence of hazardous chemicals in the environment and to determine the impact of toxicants on ecosystems (e.g., Suter and Loar 1992;
Mercury and methylmercury, in individual zooplankton: Implications for bioaccumulation
Using trace-metal-clean sampling and handling techniques along with ultrasensitive analytical procedures, it is possible to measure both total Hg and monomethylmercury (methyl-Hg) in natural
Geographic trend in mercury measured in common loon feathers and blood
The common loon (Gavia immer) is a high‐trophic‐level, long‐lived, obligate piscivore at risk from elevated levels of Hg through biomagnification and bioaccumulation. From 1991 to 1996 feather (n =
Effects of mercury on wildlife: A comprehensive review
TLDR
A critique of the current state of knowledge about effects of Hg on wildlife is presented as an aid to identifying missing information and to planning research needed for conducting a complete assessment of HG risks to wildlife.
...
...