An evaluation of the influence of substrate on the response of juvenile freshwater mussels (fatmucket, Lampsilis siliquoidea) in acute water exposures to ammonia.
Acute 96-h ammonia toxicity to three-month-old juvenile mussels (Lampsilis siliquoidea) was evaluated in four treatments (water-only, water-only with feeding, water and soil, and water and sand) using an exposure unit designed to maintain consistent pH and ammonia concentrations in overlying water and in pore water surrounding the substrates. Median effect concentrations (EC50s) for total ammonia nitrogen in the four treatments ranged from 5.6 to 7.7 mg/L and median lethal concentrations (LC50s) ranged from 7.0 to 11 mg/L at a mean pH of 8.4. Similar EC50s or LC50s with overlapping 95% confidence intervals among treatments indicated no influence of substrate on the response of mussels in acute exposures to ammonia.
Miao
Jingjing
J
U.S. Geological Survey, Columbia Environmental Research Center, 4200 New Haven Road, Columbia, Missouri 65201, USA.
Barnhart
M Christopher
MC
Brunson
Eric L
EL
Hardesty
Douglas K
DK
Ingersoll
Christopher G
CG
Wang
Ning
N
D000641:Ammonia / Q000633:toxicity*; D000818:Animals; D004305:Dose-Response Relationship, Drug; D005618:Fresh Water; D018675:Toxicity Tests; D049876:Unionidae / Q000254:growth & development / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D014874:Water Pollutants, Chemical; D000641:Ammonia