We compared the effect of herbivory by two congeneric specialist weevils (Neochetina
eichhorniae and Neochetina bruchi) on competition between their host Eichhornia crassipes
and another floating aquatic plant (Pistia stratiotes) by experimentally manipulating plant
densities, presence of either or both herbivore species, and nutrient levels. Measurements of
E. crassipes yield per original plant included biomass, clonal expansion, and flower
production. Without herbivory, intraspecific competition among E. crassipes individuals was …