01988nas a2200169   4500008004100000245008300041210006900124260000800193300001000201490000700211520148200218100001801700700002101718700001501739700001501754856004901769       2009                        eng d00aDifferential toxicity to Cd, Pb, and Cu in dragonfly larvae (Insecta: Odonata)0 aDifferential toxicity to Cd Pb and Cu in dragonfly larvae Insect  cJan  a77-840 v563 aOdonate larvae are important organisms in aquatic ecosystems but have been rarely studied in laboratory toxicity tests. Only a few previous studies have been conducted on odonates and their responses to heavy metals. We exposed two species of libellulid larvae (Anisoptera: Libellulidae) to equimolar concentrations of cadmium, lead, or copper in 7-day survival tests. Larvae were tolerant of high concentrations of cadmium and lead, as no significant decrease in survival was observed at exposures as high as 0.893 and 2.232 mM, respectively. In contrast, larvae were more sensitive to copper exposure, demonstrating significantly decreased survival to exposures as low as 2.360 microM. In whole animal samples, larvae accumulated very high concentrations (>1000 microg/g dry weight) of all three metals in an exposure-related manner. Much of this accumulation could probably be attributed to adsorption or accumulation of metal within the exoskeleton, because odonate larvae are known to sequester metals into this material. Our results were generally consistent with previous observations indicating that odonates are tolerant to metal exposures, even in comparison with other aquatic invertebrates. However, there are few studies that have used odonates in toxicity tests and compared these organisms to other aquatic life. Based on their abundance and their simple requirements in the laboratory, we believe that odonate larvae can be useful toxicological model organisms.1 aTollett, V, D1 aBenvenutti, E, L1 aDeer, L, A1 aRice, T, M  uhttps://worldodonata.myspecies.info/node/206