@article {283,
	title = {Biochemical and histochemical aspects of lead exposure in dragonfly larvae (Odonata: Anisoptera)},
	journal = {Ecotoxicol Environ Saf},
	volume = {11},
	number = {3},
	year = {1986},
	month = {Jun},
	pages = {308-19},
	abstract = {The effects of lead exposure on the oxidative properties of different organs of dragonfly larvae (advanced instars) (Odonata: Anisoptera) were estimated by biochemical and histochemical methods. The lead load of the water was 20 micrograms/liter during 6 weeks at a temperature of 15 degrees C and a normal diurnal rhythm. Lead was not accumulated in the brain, but in considerable amounts in the midgut, fat body, rectum, and cuticula of the test animals, while the control larvae showed astonishing concentrations of the heavy metal in the cuticula. The activities of the oxidative enzymes studied were significantly lowered only in the brain. Histochemically, lead could be visualized in all the organ tissues, apart from the brain, of the test animals, the controls exhibiting lead only in the cuticula. The enzyme histochemical evaluation of succinic dehydrogenase demonstrated typical changes of reaction intensities within the organs of the test animals, as compared to the controls. The results obtained are discussed in view of the specific biology of the tested animals and their normal biotope.},
	author = {Meyer, W and Harisch, G and Sagredos, A N}
}
@article {234,
	title = {Effects of temperature stress and pesticide exposure on fluctuating asymmetry and mortality of Copera annulata (Selys) (Odonata: Zygoptera) larvae},
	journal = {Ecotoxicol Environ Saf},
	volume = {67},
	number = {1},
	year = {2007},
	month = {May},
	pages = {120-7},
	abstract = {Although there have been some investigations into the effects of insecticide on the level of fluctuating asymmetry (FA) of adult damselflies, the cooperative effects of environmental factors on FA of larval damselflies were known little. This paper explored effects of exposure to temperature and pesticide on larval development of the damselfly Copera annulata (Selys). A conventional life history trait (mortality) and developmental instability (estimated by calculating fluctuating asymmetry of bilaterally symmetrical structures) were used to measure stresses in this paper. The results showed that temperature and different concentrations of pesticide produced significant effects only on developmental stability of some characters. The FA values of three traits decreased at lower concentrations, then increased slowly with increased insecticide doses. The FA values of four traits decreased slowly with increased temperatures. However, the interaction between different concentrations of insecticide and temperature was complicated and only produced significant effects on five traits. Insecticide treatment did not significantly affect mortality of the larvae of damselfly. However, mortality was significantly positively associated with temperature. There were significantly negative associations between mortality and the FA values of three traits. These results may be caused by higher mortality and short rearing time although we did not find the significant effects of concentrations on mortality. Therefore, we speculate FA may be induced if larval damselflies were treated during longer term and FA has potential as a more specific bioindicator of stresses if we guarantee enough longer rearing time without higher mortality under stressful environment.},
	author = {Chang, Xiaoli and Zhai, Baoping and Liu, Xiangdong and Wang, Min}
}
