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Distribution of Polychlorinated Biphenyls and Chlorinated Pesticide Residues in Trout in the Sierra Nevada

Department of Environmental Toxicology and the Center for Ecological Health Research, University of California, One Shields Avenue, Davis, CA 95616

View larger version (24K): [in a new window]   Fig. 1. Sierra Nevada fish sample locations and the general range of our main study area (indicated by shaded area) for high-altitude rainbow trout sampling, and an expanded map showing three sites in the central Sierra Nevada area where trout samples were collected (see arrows). Bold lines indicate high mountain divides between 3663 and 4273 m elevation. Site A: Blue Lake at 37°8'N, 118°37'30° W directly east of Mt. Mendel (4179 m) and Mt. Darwin (4240 m), a 4-h hike from Lake Sabrina. Site B: Rae Lake, Sixty Lakes Basin at 36°57'N, 188°23'W, directly east of Mt. Gardiner (3959 m) and west of Black Mountain (3970 m), a 2-d hike from Onion Valley (2803 m) through Kearsarge (3526 m) and Glenn Pass (3656 m). Site C: Pear Lake at 36°37'N, 118°40'W, directly west of Elizabeth Pass (3611 m), 3 h from Wolverton.

View larger version (25K): [in a new window]   Fig. 2. Examples of DB5 capillary gas chromatography (GC)–electron capture detector (ECD) patterns of standard polychlorinated biphenyl (PCB) samples and an example of residues found in a PCB fraction obtained from muscles of a lake trout sample from Lake Tahoe, Sierra Nevada.

View larger version (39K): [in a new window]   Fig. 3. Examples of DB5 capillary gas chromatography (GC)–electron capture detector (ECD) chromatograms of standard toxaphene, other chlorinated pesticides, and residues found in toxaphene fraction obtained from muscles of lake trout samples from Lake Tahoe, Sierra Nevada. See Table 4 for the description of lake trout.

View larger version (28K): [in a new window]   Fig. 4. Relationships between the body weights of all rainbow trout samples (see also Tables 2 and 3) collected from various locations (see Table 1) and residue levels of (A) polychlorinated biphenyl (PCB), (B) toxaphene, (C) total DDT, and (D) chlordane.

View larger version (49K): [in a new window]   Fig. 5. Paired comparisons of residue concentrations of one organochlorine compound found in all rainbow trout samples (Tables 2 and 3) and those of another organochlorine compound found in the same trout samples. The paired comparisons were (A) toxaphene vs. polychlorinated biphenyl (PCB), (B) total DDT vs. PCB, (C) chlordane vs. PCB, (D) total DDT vs. toxaphene, (E) chlordane vs. toxaphene, and (F) chlordane vs. total DDT.

View larger version (33K): [in a new window]   Fig. 6. Relationships between altitude and residue concentrations in all rainbow trout samples (Tables 2 and 3) of (A) polychlorinated biphenyl (PCB), (B) toxaphene, (C) total DDT, and (D) chlordane.

View larger version (49K): [in a new window]   Fig. 7. Relationships between elevation and body weights (A and B) or elevation between residue levels of (C) polychlorinated biphenyl (PCB), (D) toxaphene, (E) total DDT, and (F) chlordane among rainbow trout samples collected from high-altitude locations only (see Table 2).

View larger version (49K): [in a new window]   Fig. 8. Relationships between residue levels of one organochlorine compound and those of another organochlorine compound among selected samples of rainbow trout from high-altitude locations (see Table 2). The paired comparisons analyzed were (A) toxaphene vs. polychlorinated biphenyl (PCB), (B) total DDT vs. PCB, (C) chlordane vs. PCB, (D) total DDT vs. toxaphene, (E) chlordane vs. toxaphene, and (F) chlordane vs. total DDT.