Influence of constant and fluctuating salinity on responses of 'mysidopsis bahia' exposed to cadmium in a life-cycle test
Two 28-day, life-cycle tests were conducted to evaluate effects of constant and fluctuating salinities on chronic toxicity of cadmium to Mysidopsis bahia at 27C. Salinities of 10 to 32% and cadmium concentrations of 1 to 9 micrograms/l were examined. Estimated median tolerance concentrations at day 28 ranged from 4.8 to 6.3 micrograms Cd/l over the salinity range of 13 to 29%. Size and fecundity of exposed and unexposed females were predicted to be comparable when cadmium was equal or greater than 5.0 micrograms Cd/l and salinities equal or less than 20% and at concentrations of less than 5 micrograms/l at lower salinities. At higher cadmium levels both responses were impaired regardless of salinity. Reproduction in control treatments was an order of magnitude lower in low (10 and 13%) as compared to high (21, 29, 32%) salinity treatments. This effect of salinity on reproduction was not moderated by periodic exposure to higher, more suitable salinities. Survival, growth and reproduction were not impacted by addition of 5 micrograms Cd/l under fluctuating salinity conditions. The no-effect concentration is 4-5 micgrogram Cd/1 regardless of salinity. Changes in survival, growth and reproduction observed are consistent with the principal distribution of M. bahia in estuaries relative to salinity. Comparison of these data with previously reported acute responses suggests that the acute water quality criterion for cadmium should be salinity-dependent whereas the chronic criterion need not be.
- Research Organization:
- Environmental Protection Agency, Narragansett, RI (United States). Environmental Research Lab.
- OSTI ID:
- 6108175
- Report Number(s):
- PB-92-108042/XAB
- Resource Relation:
- Other Information: Pub. in Aquatic Toxicology, v19 p215-230 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CADMIUM
ECOLOGICAL CONCENTRATION
TOXICITY
CRUSTACEANS
SENSITIVITY
ANIMAL GROWTH
LIFE CYCLE
MONITORING
MORTALITY
REPRODUCTION
SALINITY
WATER POLLUTION
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
ELEMENTS
GROWTH
INVERTEBRATES
METALS
POLLUTION
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology