Predictors of mercury spatial patterns in San Francisco Bay forage fish

Greenfield, B. K.; Slotton, Darell G.; Harrold, K. H.

doi:10.1002/etc.2335

Cited by 7 publications

(1 citation statement)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variations in fish Hg concentrations are determined to some degree by the amount of Hg entering a system from atmospheric deposition 15, 16 and discharges from mines and other local sources 17, 18 . However, even among lakes and reservoirs located in the same region that receive similar levels of atmospheric Hg deposition, fish Hg concentrations can vary considerably 19 due to the complex interactions among processes that determine net Hg methylation, bioavailability, uptake and trophic transfer.…”

Section: Introductionmentioning

confidence: 99%

Key contributors to variations in fish mercury within and among freshwater reservoirs in Oklahoma, USA

Dong

Lynch

Schaider

2016

Environ. Sci.: Processes Impacts

View full text Add to dashboard Cite

Elevated fish mercury (Hg) concentrations in freshwater ecosystems worldwide are a significant human and ecological health concern. Mercury bioaccumulation and biomagnification in lakes and reservoirs are controlled by numerous biogeochemical and ecological factors, contributing to variability in fish Hg concentrations both within and among systems. We measured total mercury concentrations ([THg]) and stable isotopes (δ15N, δ13C) in over 30 fish species in two connected subtropical freshwater reservoirs (Grand Lake and Lake Hudson, Oklahoma, USA), their tributaries, and local farm ponds, all of which are potentially impacted by nearby atmospheric Hg sources. We also conducted an inter-system analysis among 61 reservoirs in Oklahoma to explore biological, chemical and physical factors associated with fish [THg] across systems. We found that [THg] for most species in Grand Lake and Lake Hudson were relatively low compared to other reservoirs in Oklahoma. There were significant spatial variations in many species within and between Grand Lake and Lake Hudson, even after accounting for length and/or trophic position (based on δ15N). Fish in local farm ponds, commonly used in the agricultural regions for raising game fish, had 2–17 times higher [THg] than fish of similar length in nearby reservoirs. The inter-system analysis revealed that pH, water color, rainfall, and nutrients are the best predictors of fish [THg] across systems. Our results provide insight into the key factors associated with fish [THg] variations both within and across systems, and may be useful for exposure assessment and for identifying sites and water bodies prone to high fish [THg] as monitoring priorities.

show abstract

Section: Introductionmentioning

confidence: 99%

Key contributors to variations in fish mercury within and among freshwater reservoirs in Oklahoma, USA

Dong

Lynch

Schaider

2016

Environ. Sci.: Processes Impacts

View full text Add to dashboard Cite

show abstract

ET&C Best Paper of 2013

2014

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Christensen et al [1] received high scores from the review panel for their article's innovative approach and public interest appeal. The study assessed the bioaccumulation of persistent organic pollutants (POPs) in coastal grizzly bears in the remote Koeye River watershed located on the central coast of British Columbia, Canada. It had many strong elements including the focus on a charismatic species, detailed chemical analyses of a large suite of polychlorinated biphenyls (PCBs), chlorinated pesticides, and polybrominated diphenyl ethers (PBDEs) using high-resolution mass spectrometry, a strong set of ancillary data characterizing the diets, and useful insights from bioaccumulation modeling. By collecting fecal/scat samples, testing was non-invasive and focused on what the bears were depurating. Dietary items (salmon and plants) available to the bears in the spring and fall months were also analyzed. The authors reached the surprising conclusion that the plant-rich spring and summer diet of the grizzlies resulted in a drawdown of POPs previously acquired through the consumption of salmon during the fall, to such an extent that net biomagnification is reduced, thus explaining why these top predators have low levels of POPs compared to other top mammalian predators like polar bears, seals, and whales. The study is a major contribution to our knowledge of bioaccumulation in terrestrial wildlife and illustrates that the term persistent is more relative than often assumed. REFERENCE [1] Christensen JR, Yunker MB, MacDuffee M, Ross PS. 2013. Plant consumption by grizzly bears reduces biomagnification of salmon-derived polychlorinated biphenyls, polybrominated diphenyl ethers, and organochlorine pesticides. Environ Toxicol Chem 32:995-1005.

show abstract

Spatial and seasonal variations of methylmercury in European glass eels (Anguilla anguilla) in the Adour estuary (France) and relation to their migratory behaviour

Claveau

Monperrus

Jarry

et al. 2015

Environ Sci Pollut Res

View full text Add to dashboard Cite

Overall recruitment of European glass eels (Anguilla anguilla) has decreased significantly since the early 1980s. Due to their long life cycle, benthic/demersal habits and high lipid content, eels might accumulate high concentrations of contaminants, but data concerning glass eels are still scarce. This study provides original data on methylmercury (MeHg) concentrations in glass eels at spatial (marine and estuarine), annual and seasonal scales. The relationship between MeHg concentrations in glass eels and their propensity to migrate up estuaries was also investigated. MeHg data were individually related to the eels' energetic condition which was estimated by dry weight. Glass eel migratory behaviour was investigated in an experimental flume and related to the MeHg concentration and dry weight at the individual scale. Marine and estuarine glass eels were caught from 2004 to 2011. There was a strong inverse correlation between MeHg concentrations and dry weight. MeHg concentrations increased in marine and estuarine glass eels from 2004 to 2009 and from 2004 to 2010, respectively, and then, both groups decreased in 2011. On a seasonal time scale, MeHg concentrations were higher at the end of the fishing season (April). MeHg bioaccumulation is likely to result from different sources, but the lack of significant differences between marine and estuarine glass eels suggests that direct contamination during estuarine migration is low. Other sources such as maternal transfer or oceanic contamination are discussed.

show abstract

Predictors of mercury spatial patterns in San Francisco Bay forage fish

Cited by 7 publications

References 62 publications

Key contributors to variations in fish mercury within and among freshwater reservoirs in Oklahoma, USA

Key contributors to variations in fish mercury within and among freshwater reservoirs in Oklahoma, USA

ET&C Best Paper of 2013

Spatial and seasonal variations of methylmercury in European glass eels (Anguilla anguilla) in the Adour estuary (France) and relation to their migratory behaviour

Contact Info

Product

Resources

About