2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/22/2018 | 2:45 PM - 3:00 PM | NITROGEN TO PHOSPHORUS RATIO AS A DRIVER OF ARSENIC RETENTION | 321

NITROGEN TO PHOSPHORUS RATIO AS A DRIVER OF ARSENIC RETENTION

Arsenic (As), a toxic trace element, can be taken into cells in place of phosphorus (P) and decouple phosphorylation, hindering energy production. Organisms take up more As when P is low, and our research shows that microbial As uptake depends on relative nitrogen (N:P), not just P concentration alone. However, the effects on higher trophic levels of increased As uptake resulting from variation in background N:P are unknown. Here, we evaluate if the N:P stoichiometry of a stream and its effects on processes associated with trophic exchanges control the retention and transport of As in geothermal streams, which are naturally rich in As. We measured food web As and invertebrate As excretion in three geothermal streams and three corresponding non-geothermal streams, all with varying N:Ps. Invertebrate P excretion was greater in As-rich geothermal streams than non-geothermal streams, and As and P excretion were both higher in low N:P (N-limited) streams; both results indicate that invertebrate excretory mechanisms may fail to distinguish between As and P and support our hypothesis that N:P drives As retention and transport in stream food webs.

Ecotoxicology
Nutrient Recycling
Food Webs

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Presenters/Authors

Keeley MacNeill (), Oregon State University, keeleymacneill@gmail.com;