Record Display for the EPA National Library Catalog

RECORD NUMBER: 11 OF 31

OLS Field Name OLS Field Data
Main Title Effect of Nutrition on the Response of Field Populations of the Calanoid Copepod 'Acartia tonsa' to Copper.
Author Sosnowski, S. L. ; Germond, D. J. ; Gentile, J. H. ;
CORP Author Environmental Research Lab., Narragansett, RI.
Year Published 1978
Report Number EPA/600/J-79/031;
Stock Number PB-299 253
Additional Subjects Toxicology ; Narragansett Bay ; Nutrition ; Copper ; Sensitivity ; Metals ; Concentration(Composition) ; Adenosine phosphates ; Water pollution ; Acartia tonsa ; Toxic substances ; Heavy metals ; Water pollution effects(Animals)
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-299 253 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 6p
Abstract
Continuous flow toxicity tests were conducted on field populations of adult Acartia tonsa collected from Narragansett Bay. Potential algal food at the collection site was estimated from ATP and chlorophyll analysis. There was positive correlation (P < 0.01) between chlorophyll a and ATP. Integration of these data with quantitative zooplankton analysis established that A. tonsa had a significant grazing effect on algal biomass (P < 0.05). The natural population dynamics of A. tonsa during this period were assessed from microscopic analysis of tow material. The sensitivity of A. tonsa to total copper ranged from 9.0 to 78.0 micrograms per liter for 72 h LC50's. Results show an inverse correlation (P < 0.05) between the log LC50 and adult A. tonsa density at the time of collection. The relationship between A. tonsa sensitivity to copper and the food ration (algal density/A. tonsa density) has been described by a quadratic function which has a correlation coefficient of 0.78. This indicates that the log LC50 increases with increasing food ration up to a point and then remains constant. A comparison of confidence intervals about the LC50's indicates greater variability in the response of field animals compared to previous studies with cultured populations. This data suggests that field populations of A. tonsa can be expected to exhibit a wide range of sensitivity to other pollutants. Sensitivity is strongly correlated with population density and food ration.