Abstract
TOSC (Total Oxyradical Scavenging Capacity) which plays an essential role in cell defense against reactive oxygen species (ROS) apply to the development of environmental monitoring to protect biological system. First, local investigations of TOSC of Stenopsyche marmorata show that TOSC increase according to the growth level between third- and fifth- instar. Therefore, the correction of TOSC with growth level would be needed for applying to environmental monitoring using different wet weight, except immature organisms. Second, to study the effect of river environmental change on TOSC, the specimens were exposed to short term variation in water temperature and turbidity in lab tests. High water temperature caused S.marmorata death in the elevated water temperature test. It indicates the higher water temperature is a strong stress on the species. Therefore, TOSC abrupt decreased compete with ROS caused by stress of high water temperature. Three days later, the survival rate decreased and the TOSC recovered in the stressful condition. TOSC also responds to turbidity over the threshold, regardless of death. As a result, TOSC would be one of the usefull tool to detect effect of short-term environmental change on river organism S.marmorata.
