2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2018 | 11:45 AM - 12:00 PM | ENGINEERED NANOPARTICLES INCREASE EXCRETION RATES OF NITROGEN AND PHOSPHORUS BY FRESHWATER SNAILS IN WETLAND MESOCOSMS | 321

ENGINEERED NANOPARTICLES INCREASE EXCRETION RATES OF NITROGEN AND PHOSPHORUS BY FRESHWATER SNAILS IN WETLAND MESOCOSMS

Wetlands are exposed to engineered nanoparticles through discharge from wastewater and agricultural runoff. We conducted an experiment to examine the combined effects of chronic dosing of nanoparticles and nutrients on wetland food webs. Three levels of nanoparticles (control, gold, copper) were crossed by two levels of nutrients (ambient vs. chronic nutrient dosing) in 18 outdoor wetland mesocosms. We measured the rate of excretion of nitrogen (N) and phosphorus (P) in freshwater snails after six months exposure to chronic nanoparticle and nutrient dosing. Ten Physella acuta snails were collected from each mesocosm. Individual snails were placed into tubes containing filtered, control mesocosm water. Snails were incubated for 95 ± 0.5 minutes (mean ± SE). Mass-specific, time-corrected N and P excretion rates were calculated as the change in concentration per unit time divided by snail dry mass. Excretion of N and P was significantly higher in all nutrient-dosed mesocosms than ambient nutrient controls. However, under ambient nutrient levels, gold and copper nanoparticle treatments each significantly increased snail N and P excretion. These results imply that nanoparticles may interfere with snail digestion and nutrient assimilation, particularly under low nutrient conditions.

Stoichiometry
Mesocosm
Metabolism

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Presenters/Authors

Brittany Perrotta (), Baylor University, bperrotta16@gmail.com;