description of the eight sampling sites where decaying leaf litter were collected.

aThe sites referred to as “treated” correspond to mosquito breeding sites where annual spreading of the insecticide Bti occurred for more than ten years. No Bti treatment was ever applied in “untreated” areas.
bThe leaf litter samples were submitted to the 3-step process for in vitro synthesis of the toxicity: when more than 80% mortality was obtained in the bioassays for at least two leaf litter samples from the same site, the columns were referred to as “+”.