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Table 3. (concluded) <br />Ecosystem, organism, and Arsenic concentration Referencea <br />other variables and effects <br />TERRESTRIAL INVERTEBRATES <br />Honeybee, AApis <br />mellifera <br />Inorganic arsenite Following arsenic spray dusting, <br /> dead bees contained 20.8 to <br /> 31.2 mg/kg FW (adults) <br /> or 5 to 13 mg/kg <br /> FW (larvae). 6 <br />Beetles <br />Cacodylic acid Dietary levels of 100 to <br /> 1,000 mg/kg fatal to <br /> certain pestiferous species. 3 <br />Western spruce budworm, <br />Choristoneura occidentalis, <br />sixth instar stage <br />Arsenic trioxide Dietary levels of 99.5 mg/kg <br /> FW killed 10%, 2,550 <br /> mg/kg killed 50%, and <br /> 65,300 mg/kg was fatal <br /> to 90%. Newly molted <br /> pupae and adults of As- <br /> exposed larvae had reduced <br /> weight. Regardless of dietary <br /> levels, concentrations of As <br /> ranged up to 2,640 mg/kg DW <br /> in dead pupae, and 1,708 mg/kg <br /> DW in adults. 7 <br />aReferences: 1, NRCC 1978; 2, Wang et al. 1984; 3, Hood 1985; 4, Sheppard et <br />al. 1985; 5, Marques and Anderson 1986; 6, Jenkins 1980; 7, Robertson and <br />McLean 1985. <br />42