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Several groups ofGammarus lacustris adults were exposed to solutions containing 0.5 and 5.0 mg ofBacillus thuringiensis subsp.israelensis per liter for 1- or 24-h periods by using traditional static bioassay exposure procedures. During a postexposure holding period, fecal pellets were removed and plated on tryptic soy agar to determineB. thuringiensis subsp.israelensis spore content. The experiments verified that traditional exposure procedures assure ingestion ofB. thuringiensis subsp.israelensis spores and provided a mean dose estimate of 1,948 spores ingested per test animal with a 95% confidence interval ranging from 891 to 4,296 (1-h exposure, 5.0 mg/liter). It was also found that dose level is highly dependent upon both exposure duration and concentration and that relatively short exposures can result in a relatively long-term retention of spores postexposure (≥30 days). Body burden experiments established that large numbers of spores adsorb to the bodies of test animals during exposure and may in part explain the long-term retention of spores in the test system postexposure. These results imply that in field applications of microbial control agents, toxicologically unaffected but exposed organisms might transport the agent to untreated sites, expanding the effective treatment area and the number of organisms exposed.

Ingestion and Adsorption of Bacillus thuringiensis subsp. israelensis by Gammarus lacustris in the Laboratory