Abstract:
:Sand fiddler crabs, Uca panacea, were exposed in laboratory habitats to measured concentrations of ULV-grade fenthion via simulated aerial spray at 5% and 50% of field rate application of 6-12 mg fenthion/m(2) (0.05-0.10 lbs fenthion/acre). Two habitats served as controls, and two habitats served as replicates for each of the test exposures. The aerial application was repeated 12 times between July 7, 1997, and August 15, 1997, during the period of the most active larval production of the crabs. The resulting measured concentrations of fenthion at the surface and in the water were consistently lower than what the application rate would have suggested. Statistical analysis of total, daily larval counts showed a periodicity of approximately 14 days that did not appear to be affected by fenthion, at least at the 5% application rate, where a 15% reduction in larval production was noted by the end of the second hatching cycle and a 25% reduction by the end of the third. Larval production in the habitats exposed to the 50% application rate was reduced by 18% at the end of the first hatching cycle, 77% at the end of the second, and 100% at the end of the third hatching cycle. At the end of the third hatching cycle, adult crab mortality observed at the surface was 0%, 3%, and 20% for the control, 5%-, and 50%-exposure habitats, respectively. Three weeks after the final fenthion application, survival of adult crabs was 100% in the control habitats, 75% in the 5%-exposure habitats, and 3% in the 50%-exposure habitats. Survival of unfed first-stage zoeae released during the night following the sprays averaged 4.6 +/- 0.9, 3.7 +/- 0.9 and 1.7 +/- 0.6 days for control, 5%-, and 50%-exposure habitats, respectively. Forty-eight-hour LC-50s (nominal) for fenthion exposure of adult crabs submerged in water and for first-stage zoeae were 215 microg fenthion/L and 0.8 microg fenthion/L, respectively.
journal_name
Arch Environ Contam Toxicoljournal_title
Archives of environmental contamination and toxicologyauthors
Schoor WP,Middaugh DP,Marcovich DTdoi
10.1007/s002449910043subject
Has Abstractpub_date
2000-04-01 00:00:00pages
327-33issue
3eissn
0090-4341issn
1432-0703pii
10.1007/s002449910043journal_volume
38pub_type
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