Geographic drivers of mercury entry into aquatic food webs revealed by mercury stable isotopes in dragonfly larvae
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Abstract
Atmospheric mercury (Hg) emissions and subsequent transport and deposition are major concerns within protected lands, including national parks, where Hg can bioaccumulate to levels detrimental to human and wildlife health. Despite this risk to biological resources, there is limited understanding of the relative importance of different Hg sources and delivery pathways within protected regions. Here, we used Hg stable isotope measurements of a single aquatic bioindicator, dragonfly larvae, to determine if these tracers can resolve spatial patterns in Hg sources, delivery mechanisms, and aquatic cycling at a national scale. Mercury isotope values in dragonfly tissues varied among habitat types (e.g., lentic, lotic, wetland) and geographic location. Photochemical-derived isotope fractionation was habitat-dependent and influenced by factors that impact light penetration directly or indirectly, including dissolved organic matter, canopy cover, and total phosphorus. Strong patterns for Δ200Hg emerged in the western US, highlighting the relative importance of wet deposition sources in arid regions in contrast to dry deposition delivery in forested regions. This work highlights the efficacy of dragonfly larvae as biosentinels for Hg isotope studies due to their ubiquity across freshwater ecosystems and ability to track variation in Hg sources and processing attributed to small-scale habitat and large-scale regional patterns.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geographic drivers of mercury entry into aquatic food webs revealed by mercury stable isotopes in dragonfly larvae |
| Series title | Environmental Science and Technology |
| DOI | 10.1021/acs.est.4c02436 |
| Volume | 58 |
| Issue | 30 |
| Year Published | 2024 |
| Language | English |
| Publisher | American Chemical Society |
| Contributing office(s) | Forest and Rangeland Ecosys Science Center, Upper Midwest Water Science Center |
| Description | 12 p. |
| First page | 13444 |
| Last page | 13455 |
| Google Analytic Metrics | Metrics page |