Uranium bioaccumulation dynamics in the mayfly Neocloeon triangulifer and application to site-specific prediction
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- Data Release: USGS data release - Data for laboratory experiments conducted with the mayfly Neocloeon triangulifer to derive uranium bioaccumulation parameters and predict site-specific U accumulation, 2016-2019
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Abstract
Little is known about the underlying mechanisms governing the bioaccumulation of uranium (U) in aquatic insects. We experimentally parameterized conditional rate constants for aqueous U uptake, dietary U uptake, and U elimination for the aquatic baetid mayfly Neocloeon triangulifer. Results showed that this species accumulates U from both the surrounding water and diet, with waterborne uptake prevailing. Elevated dietary U concentrations decreased feeding rates, presumably by altering food palatability or impairing the mayfly’s digestive processes, or both. Nearly 90% of the accumulated U was eliminated within 24 h after the waterborne exposure ceased, reflecting the desorption of weakly bound U from the insect’s integument. To examine whether the experimentally derived rate constants for N. triangulifer could be generalized to baetid mayflies, mayfly U concentrations were predicted using the water chemistry and U measured in periphyton from springs in Grand Canyon (United States) and were compared to U concentrations in spring-dwelling mayflies. Predicted and observed mayfly U concentrations were in good agreement. Under the modeled site-specific conditions, waterborne U uptake accounted for 52–93% of the bioaccumulated U. U accumulation was limited in these wild populations due to a combination of factors including low concentrations of bioavailable dissolved U species, slow U uptake rates from food, and fast U elimination.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Uranium bioaccumulation dynamics in the mayfly Neocloeon triangulifer and application to site-specific prediction |
| Series title | Environmental Science & Technology |
| DOI | 10.1021/acs.est.0c03372 |
| Volume | 54 |
| Issue | 18 |
| Year Published | 2020 |
| Language | English |
| Publisher | American Chemical Society |
| Contributing office(s) | Fort Collins Science Center, WMA - Earth System Processes Division |
| Description | 9 p. |
| First page | 11313 |
| Last page | 11321 |
| Google Analytic Metrics | Metrics page |