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TRANSGENERATIONAL EFFECTS OF A JUVENILE HORMONE MIMIC ON THE ESTUARINE MYSID, MYSIDOPSIS BAHIA (CRUSTACEA: MYSIDACEA)
Citation:
McKenney Jr., C L., P S. Harris, S. F. Nates, G M. Cripe, AND M D. Hoglund. TRANSGENERATIONAL EFFECTS OF A JUVENILE HORMONE MIMIC ON THE ESTUARINE MYSID, MYSIDOPSIS BAHIA (CRUSTACEA: MYSIDACEA). Presented at SETAC 20th Annual Meeting, Philadelphia, PA, November 14-18, 1999.
Description:
Fenoxycarb is a juvenile hormone (JH) mimic used to control insect pests by interfering with reproductive and developmental processes mediated by JH. Crustaceans are ideal organisms to monitor environmental effects of these endocrine disruptors, since they are dominant aquatic arthropods that have been shown to contain functional hormones similar in structure to JH. Survival, growth, development and reproduction of the estuarine mysid, Mysidopsis bahia, were monitored through an entire life cycle during flow-through laboratory exposures to a range of concentrations (1-43 |g/l) of fenoxycarb. Similar responses were monitored during the second generation without additional exposure. Exposure to 43 |g/l significantly reduced mysid survival through first brood production. Juvenile mysid growth and both carbon and nitrogen accumulation were reduced during the second week of exposure to 1 and 6 |g/l. Neither maturation times, sex determination nor young production were altered by fenoxycarb exposure from 1-43 |g/l. Nevertheless, exposure to 43 |g/l reduced young production by greater than two-thirds and increased the percentage of males by 50%. Female growth through reproduction was linearly reduced (R2=0.92) by fenoxycarb exposure, but not male growth (R2=0.13). Reproducing females contained less lipids following exosure to 1 and 6 |g/l. Second generation adults, exposed to fenoxycarb only as developing embryos and larvae, produced fewer young when developing in 6 |g/l and contained significantly less males when developing in 1|g/l. These results suggest that estuarine crustaceans may serve as sensitive indicators of endocrine disrupting compounds in the marine environment.