Effects of fluoranthene-spiked sediments and ultraviolet light on the respiration and reproduction of Hyalella azteca
- Autonomous Metropolitan Univ., Mexico City (Mexico). Hydrobiology Dept.
The objective of this study was to assess the combined effect of fluoranthene-spiked sediments and simulated solar ultraviolet radiation (SSUVR) on the amphipod Hyalella azteca. Previous work demonstrated that sediments spiked at the Sediment Quality Criterion (SQC) for fluoranthene caused significant mortality in H. azteca if SSUVR was also present. The median lethal concentration was found to be 203.27 g fluoranthene/g organic carbon at a UVA intensity of 53.7 w/cm{sup 2}. The author then exposed adult organisms to two sublethal concentrations of fluoranthene and SSUVR for 21 days. During the last week of exposure, whole organism respiration was measured. At the end of the exposure all females were sacrificed and the number of eggs per female counted. Respiration rates of the exposed animals ranged from 1.5 to 1.9 times higher than those of the controls. These results indicate that even at sublethal concentrations fluoranthene + SSUVR changed the energy partitioning of these organisms. However, no differences were found in the number of eggs per female between fluoranthene and control exposure groups. This result may reflect the fact that the eggs were formed before the exposure and, consequently, no change in their number occurred. A long-term exposure initiated with juvenile amphipods to these same conditions would be more appropriate to assess effects of fluoranthene + SSUVR on reproduction and other bioenergetic components of these organisms.
- OSTI ID:
- 455326
- Report Number(s):
- CONF-961149--
- Country of Publication:
- United States
- Language:
- English
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