Yh. Duan et al., Genotype and toxicity relationships among Hyalella azteca: II. Acute exposure to fluoranthene-contaminated sediment, ENV TOX CH, 19(5), 2000, pp. 1422-1426
This study examined the genotypic responses of Hyalella azteca to the toxic
ity of sediment contaminated by the polycyclic aromatic hydrocarbon (PAH) f
luoranthene. We monitored the time to death fur 696 H. azteca exposed to ul
traviolet light and sediment spiked with fluoranthene. The survival distrib
ution functions within the genotypes at each of three variable allozyme loc
i (acid phosphatase [ACP*], glucose-6-phosphate isomerase [GPI*], and phosp
hoglucomutase [PGM*]) were compared using a log-rank test. Results shea-ed
significant differences among SDFs at all three loci. No association of het
erozygosity with time to death was observed. The homozygote ACP*-CC was ass
ociated with decreased survivorship compared with ACP*-AA, ACP*-BB, and ACP
*-AB. However, GPI*-AA was associated with increased survivorship compared
with GPI*-BB, GPI*-CC, and GPI*-BC. Significant differences in resistance a
lso were observed for PGM*-BB versus either PGM*-AC or PGM*-BC. These resul
ts indicate that differential resistance to PAH phototoxicity was genetical
ly related, producing significant alteration in the frequencies of several
genotypes in the population.