Electron transport system (ETS) activity and oxygen consumption of two amphibious isopods, epigean Ligia italica and hypogean Titanethes albus, were measured in air and in water with the aim of estimating the exploitation of metabolic potential for actual metabolism in the two media. Both species exhibited high and variable ETS/R ratio which is characteristic of animals that have to cope with changing environmental conditions in their habitats.
The physiological responses of two crustaceans, Asellus aquaticus and Gammarus fossarum, following in vitro exposure to two pesticides were measured. Both species responded to short-term exposure with elevated levels of respiration (R) and/or lower levels of electron transport system (ETS) activity. The combination of these two methods provides a useful and effective tool for assessing the general condition of aquatic animals. ETS/R ratio may be used as a quick predictor of effects on organisms exposed to pesticides.