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Plant nutrition (bottom‐up effects) impacts a plant's ability to withstand herbivory (top‐down effects) and influences phytophagous insect fecundity. These factors confound efficacy predictions for biological control purposes. We investigated the importance of these forces with regard to invasibility of Eichhornia crassipes. We also examined whether one could have predicted whether the weevil species...
1. Nutrient availability varies widely in aquatic systems and is likely to profoundly affect the outcomes of plant–herbivore interactions in aquatic environments. This has implications in programmes aimed at the biological control of water weeds. We hypothesized that nutrient flux seasonally affects ovarian development of two specialist weevil species, Neochetina eichhorniae and Neochetina bruchi,...
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