A number of approaches were undertaken to determine if there were impacts associated with the high abundance of one of these secondary invaders, the giant African land snail A. fulica. This pan-tropical invader is considered a significant agricultural pest, yet no study has assessed their impacts in a natural setting. An exclusion experiment found little to no evidence that highly abundant GALS has any impact on seedling recruitment or leaf litter dynamics. Direct observation and stable isotope analysis indicate GALS are primarily detritivorous, but the experiment showed that even at high density, these snails do not consume sufficient biomass to significantly lower the standing crop of litter