Science Inventory

EFFECT OF SALINITY VARIATION AND PESTICIDE EXPOSURE ON AN ESTUARINE HARPACTICOID COPEPOD, MICROARTHRIDION LITTORALE (POPPE), IN THE SOUTHEASTERN US. (R827397)

Citation:

Staton, J. L., N. V. Schizas, S. L. Klosterhaus, R. J. Griffitt, G. T. Chandler, AND B. C. Coull. EFFECT OF SALINITY VARIATION AND PESTICIDE EXPOSURE ON AN ESTUARINE HARPACTICOID COPEPOD, MICROARTHRIDION LITTORALE (POPPE), IN THE SOUTHEASTERN US. (R827397). JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY 278(2):101-110, (2002).

Description:

The harpacticoid copepod Microarthridion littorale (Poppe) was tested for interaction effects between salinity change and acute pesticide exposure on the survival and genotypic composition of a South Carolina population. Previous data suggested a significant link between a combined exposure to chlorpyrifos (CHPY) and dichloro-diphenyl-trichloroethane (DDT) and mitochondrial haplotype in the cytochrome b apoenzyme for this euryhaline species when exposed at 12-ppt salinity seawater. Our tests demonstrate a significant non-linear survival response for M. littorale to short-term immersion (24 h) in 3-, 12- and 35-ppt seawater, with copepods transferred to 12-ppt seawater having the lowest survival. There was significant statistical interaction between salinity and pesticide exposure for the dependent variable "survival." However, changes in genetic composition of survivors were not significant, and they were complicated by extremely low survival in the pesticide/3 ppt and pesticide/36 ppt treatments. As noted for many studies of harpacticoids, males faired worse than females in all treatments, with none surviving pesticide exposure at 45 small mu, Greekg/l CHPY and 6 small mu, Greekg/l DDT.

Author Keywords: Copepods; Genetics; Multiple stressors; Pesticide; Salinity; Toxicity

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 01/01/2002
Record Last Revised: 12/22/2005
Record ID: 85155

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL CENTER FOR ENVIRONMENTAL RESEARCH