ISSN:
1432-0703
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Energietechnik
,
Medizin
Notizen:
Abstract Species differences were seen among fresh-water invertebrates and fishes in the absorption and subsequent retention of photodieldrin (a sunlight conversion product of the insecticide, dieldrin). The crayfishCambarus and the clamSimpsoniconcha showed extremely low levels of absorption and accumulation while the larvae of the mosquitoAedes, the amphipodGammarus, and the cladoceransSimocephalus, and fresh-water fleaDaphnia showed much higher levels of this insecticide. Maximum absorption occurred within 12 to 24 hours of exposure in only a few invertebrates but in most fishes. Among fishes, five to six times higher levels were seen during this period in guppy and goldfish than in minnow and bluegill. While the livebearer, guppy, kept absorbing photodieldrin with time, other fishes showed a slight decline in their tissue levels of this insecticide. The maximum biological magnification ratios during peak periods of absorption were: 133 for bluegill, 150 for minnow, 609 for goldfish, and 820 for guppy. Among microcrustacea the maximum biological magnification ratios seen after four days of continuous exposure were about 1000 forSimocephalus, 1200 forGammarus, and 63,000 forDaphnia. No appreciablein vivo metabolism of photodieldrin was seen in fishes, minnow and bluegill, and the decline in their body levels of photodieldrin is apparently not due to detoxication of the latter.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02047095
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