Is it worth having an adequate energetic state to detoxify a pesticide?

CUNNINGHAM, M.; MOLINA, G.; ROMERO, S.; GARCÍA, C.F.; LAINO, A.; TRABALON, M.

Canterbury

Congreso; XXI International Congress of Arachnology; 2019

The use of pesticides for pest control impacts on ecosystems, affecting directly or indirectlynon-target organisms such as spiders. How they respond in the face of xenobiotics depends,among other factors, on their energetic state, which is a reflection of their metabolic state. Inthe present work we assess the energetic state of Polybetes pythagoricus in different metabolicsituations (females before and after vitellogenesis, juvenile, and adult males), and howcypermethrin affects mortality, the enzyme activity of the antioxidant system, and lipidperoxidation. As a result, it was observed that the calories provided by both glycogen and lipidsin females before and after vitellogenesis were 38.1 and 22.4 cal/gr respectively. In the case ofmalesand juveniles, the values were of 33.4 cal/gr and 56.1 cal/gr respectively. Thetriacylglyceride/free fatty acid relation determined that juveniles have higher lipid dynamics.The LD50 for females before and after vitellogenesis were 969 and 1108 ngr/gr, and was 1060ngr/gr and 103 ngr/gr for males and juveniles respectively. In exposed adult spiders, weobserved an increase of 0.8 to 5.5 times in superoxide-dismutase activity compared to control.The catalase activity of males saw no significant increase while an increase in females wasobserved. Lipid peroxidation showed an increase in adults of 0.5 times. Although juveniles hada high caloric content, no increase was observed in superoxide-dismutase activity and catalase,coinciding with the high increment observed in the lipid peroxidation (14 times) produced bythe reactive oxygen species.