Schmitz (1998) studied indirect interactions in a 3-level system: predator (Spider), herbivore (Grasshopper), and resources (Grass and Herbs). This plot shows Herb abundance with resources alone (1-level), resources and herbivores (2- level), and all three levels (Risk = spiders can’t eat, Predation =spiders eat). Based on these data, what how would you describe the impact
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