Abstract
The effects of moulting between instars and metamorphosis on the contents of Cd were studied in T. molitor larvae both by following the radioactive tracer 108Cd ingested on one occasion and by analysing Cd concentration in larvae and newly hatched adults with a continuous intake of Cd. Larvae were given 109Cd in one meal. Contents of 109Cd were then determined periodically throughout the larval stage and in newly hatched adults. Moulting lowered the 109Cd contents, but to a smaller degree compared with metamorphosis. The rate of reduction during these processes decreased with time elapsed since ingestion of 109Cd and moulting or metamorphosis. At metamorphosis, the loss of 109Cd took place almost entirely at the pupation. With a continuous intake of Cd, concentrations in T. molitor were correlated to those in their food. Newly hatched adults had lower Cd concentrations than the corresponding larvae, when Cd concentrations in food were high.
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