Ecosystem drivers of freshwater mercury bioaccumulation are context-dependent: Insights from continental-scale modeling
Links
- More information: Publisher Index Page (via DOI)
- Open Access Version: Publisher Index Page
- Download citation as: RIS | Dublin Core
Abstract
Significant variation in mercury (Hg) bioaccumulation is observed across the diversity of freshwater ecosystems in North America. While there is support for the major drivers of Hg bioaccumulation, the relative influence of different external factors can vary widely among waterbodies, which makes predicting Hg risk across large spatial scales particularly challenging. We modeled Hg bioaccumulation by coupling Hg concentrations in more than 21,000 dragonflies collected across the United States from 2008 to 2021 with a suite of chemical (e.g., dissolved organic carbon (DOC), pH, sulfate) and landscape (e.g., soil characteristics, land cover) variables representing external drivers of Hg methylation, transport, and uptake. Model predictions explained 85% of the variation in dragonfly Hg concentrations across the United States. Certain predictor variables were more important than others (e.g., DOC, pH, and percent wetland), and they varied among waterbodies. Variation in Hg bioaccumulation was explained by including habitat and ecosystem type in a hierarchical modeling framework, which confirms the context-dependency of external factors in explaining Hg bioaccumulation across disparate freshwater ecosystems. This continent-scale model provides valuable insights into the processes underlying landscape-scale patterns in Hg exposure risk and demonstrates that drivers of Hg methylation and bioaccumulation are habitat- and ecosystem-dependent.
Study Area
Publication type | Article |
---|---|
Publication Subtype | Journal Article |
Title | Ecosystem drivers of freshwater mercury bioaccumulation are context-dependent: Insights from continental-scale modeling |
Series title | Environmental Science and Technology |
DOI | 10.1021/acs.est.4c07280 |
Volume | 59 |
Issue | 3 |
Year Published | 2025 |
Language | English |
Publisher | American Chemical Society |
Contributing office(s) | Columbia Environmental Research Center, Forest and Rangeland Ecosys Science Center, Fort Collins Science Center |
Description | 10 p. |
Country | United States |
Google Analytic Metrics | Metrics page |