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Age-Specific Sensitivity of Grass Shrimp (Palaemonetes Pugio) Embryos to Sublethal Concentrations of Diflubenzuron / JEH Wilson

Conference Author
Environmental Toxicology and Risk Assessment: Modeling and Risk Assessment Sixth Volume (6th : 1996 : Orlando, FL)
Physical Description
1 online resource (18 pages) : illustrations, figures, tables
Additional Creators
Wilson, JEH, American Society for Testing and Materials, and ASTM International
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Summary
Ovigerous grass shrimp (Palaemonetes pugio) carrying 0.5-, 1-, 3-, 6-, and 8-day-old embryos (i.e., stages 1, 2, 3, 4 and 5, respectively) were exposed continuously for 4 days to a single dose of difiubenzuron (DFB) at sublethal concentrations (0.3 to 5.0 ?g/L) in a static system. After the 4-day exposure, the shrimp were transferred to DFB-free seawater for the rest of the embryonic development. When the eggs hatched, the following toxicity-endpoints were measured: Hatchability (% hatch), larval viability (% of larvae surviving to the postlarval stage), duration of larval development from hatching to the postlarval stage, and severity of morphological abnormality in the larvae after hatching. There was no correlation between the age of the embryos at exposure and either hatchability or duration of larval development. Also, severity of abnormality did not vary with age of embryos except at an exposure concentration of 2.5 ?g/L. However, within each age group of the embryos, the severity of larval abnormality was and duration of larval development was concentration dependent. Larval viability was significantly (P < 0.05) affected by the age of the embryos at the time of exposure to DFB. For all the test concentrations, exposure of 0.5- and 1-day-old embryos resulted in larval viability that was similar to the control group (viability > 80%). However, when 6- and 8-day-old embryos were exposed to DFB concentrations > 0.5 ?g/L, larval viability was significantly (P < 0.05) less than the controls. These results indicate that older embryos (at more advanced stages of development) of the grass shrimp are more sensitive to sublethal DFB concentrations.
Dates of Publication and/or Sequential Designation
Volume 1997, Issue 1317 (January 1997)
Subject(s)
Other Subject(s)
ISBN
0803124740
9780803124745
9780803153707 (e-ISBN)
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 22.
Other Forms
Also available in PDF edition.
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1997. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
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ASTM International PDF Purchase price USD25.
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