What would happen if we removed the rabbit and the capybara from the food web?

By removing the rabbit and the capybara from the food web above, you are essentially taking away the food(energy) for both the jaguar and crocodile(can't tell if it's an alligator). This will ultimately cause both the predators to starve and die off because they will not have any food to supply themselves with energy to keep them alive. Hope this helps!

Long term continuous groundwater monitoring, especially with warning systems and anthropic activity monitors