Project 2: Abstract Consumption of fish contaminated with mercury is a serious public health concern in the US and globally. Marine fish are the most important agents of exposure for humans to methylmercury (MeHg), the most toxic form of mercury. MeHg exposure is of particular concern for pregnant women and children and has known neurological, developmental, cardiovascular, and immunological effects. The overall goal of Project 2 is to determine how changes in multiple environmental factors will alter the production and fate of MeHg in estuarine food webs, which are important pathways of exposure to humans. We will investigate the interactive effects (additive and non-additive) of changes in temperature, salinity, and carbon content on the production and fate of MeHg in coastal marine systems in order to predict the net influence of regional variability as well as climate change on human exposure to MeHg. The project will utilize field studies and laboratory experiments to measure the effect of a range of environmentally relevant temperatures, salinities, and carbon loads on microbial activity, Hg methylation and MeHg demethylation rates, sediment MeHg content and Hg and MeHg flux from sediments to overlying water. Laboratory and mesocosm experiments will be conducted to examine the individual and combined effects of temperature, salinity and organic carbon on the bioconcentration of MeHg into phytoplankton, and trophic transfer to zooplankton and fish that are prey for higher trophic level fish consumed by humans. Field work and mesocosms experiments will be undertaken in estuaries located at different latitudes with high and low carbon concentrations in sediments in order to compare MeHg processes under different biogeochemical and temperature regimes. Data obtained from laboratory and field experiments will be used to parameterize and link current fate, transport, and bioaccumulation models with human exposure models. These combined approaches will improve our understanding of the impact of complex environmental alterations on MeHg fate and bioaccumulation in marine ecosystems, and the impact of these factors on MeHg exposure to humans.
Project 2: Narrative Hg is a widespread contaminant in marine fish that has neurological, immunological, and cardiovascular effects on humans. Pregnant women and children are the most vulnerable populations. The proposed study will allow us to understand how changes in the environment will affect MeHg fate and bioaccumulation in fish and resulting impacts on human exposure to MeHg through fish consumption.
|Taylor, V F; Buckman, K L; Seelen, E A et al. (2018) Organic carbon content drives methylmercury levels in the water column and in estuarine food webs across latitudes in the Northeast United States. Environ Pollut 246:639-649|
|Shi, Xiangming; Mason, Robert P; Charette, Matthew A et al. (2018) Mercury flux from salt marsh sediments: Insights from a comparison between 224Ra/228Th disequilibrium and core incubation methods. Geochim Cosmochim Acta 222:569-583|
|Andrew, Angeline S; Chen, Celia Y; Caller, Tracie A et al. (2018) Toenail mercury Levels are associated with amyotrophic lateral sclerosis risk. Muscle Nerve :|
|Eagles-Smith, Collin A; Silbergeld, Ellen K; Basu, Niladri et al. (2018) Modulators of mercury risk to wildlife and humans in the context of rapid global change. Ambio 47:170-197|
|Obrist, Daniel; Kirk, Jane L; Zhang, Lei et al. (2018) A review of global environmental mercury processes in response to human and natural perturbations: Changes of emissions, climate, and land use. Ambio 47:116-140|
|Farzan, Shohreh F; Howe, Caitlin G; Chen, Yu et al. (2018) Prenatal lead exposure and elevated blood pressure in children. Environ Int 121:1289-1296|
|Deyssenroth, Maya A; Gennings, Chris; Liu, Shelley H et al. (2018) Intrauterine multi-metal exposure is associated with reduced fetal growth through modulation of the placental gene network. Environ Int 120:373-381|
|Chen, Celia Y; Driscoll, Charles T; Eagles-Smith, Collin A et al. (2018) A Critical Time for Mercury Science to Inform Global Policy. Environ Sci Technol 52:9556-9561|
|Punshon, Tracy; Carey, Anne-Marie; Ricachenevsky, Felipe Klein et al. (2018) Elemental distribution in developing rice grains and the effect of flag-leaf arsenate exposure. Environ Exp Bot 149:51-58|
|Liu, Maodian; Zhang, Qianru; Luo, Yao et al. (2018) Impact of Water-Induced Soil Erosion on the Terrestrial Transport and Atmospheric Emission of Mercury in China. Environ Sci Technol 52:6945-6956|
Showing the most recent 10 out of 372 publications