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EFFECTS OF FENOXYCARB EXPOSURE ON COMPLETE LARVAL STAGES OF THE XANTHID CRAB, RHITHROPANOPEUS HARRISII
Citation:
Cripe, G M., C L. McKenney Jr., M D. Hoglund, AND P S. Harris. EFFECTS OF FENOXYCARB EXPOSURE ON COMPLETE LARVAL STAGES OF THE XANTHID CRAB, RHITHROPANOPEUS HARRISII. ENVIRONMENTAL POLLUTION 125(2):295-299, (2003).
Impact/Purpose:
Journal article
Description:
Pest control agents, such as juvenile hormone analogues (JHA), have been developed to limit effects on non-target organisms that co-inhabit insect pest habitats. Rhithropanopeus harrisii, an estuarine xanthid crab, was used to observe the impacts of the JHA, fenoxycarb, on the pattern of complete larval development as well as survival of larvae and successful metamorphosis to first crab stage. Significant mortality occurred in the first of four zoeal stages (after 2-3 days of exposure) at the highest treatment of 240 ?g fenoxycarb/L and in
megalopae exposed to 48 ?g fenoxycarb/L. The time required to metamorphose to the first crab stage was significantly increased for megalopae in all treatments greater than or equal to 48 ?g/L. This delay in development was sufficient to significantly prolong the entire developmental period from zoea to crabs. Unexposed larvae developed to crabs in an average of 16 days; larvae exposed to greater than of equal to 48 ?g/L required 19-20 days. Reduced survival and extended duration of developing larval stages in the life history of a benthic invertebrate may alter the population dynamics of these organisms in the estuary.