I'm sure most of these concepts of the fragile and perfect food web are garbage. Nature is constantly adjusting to changing conditions. The world doesn't collapse because bears stop salmon pooping in the mountains.
Gaia didn't provide a perfectly balanced nature that humanity ruins at every turn. We improve nature to make it suit our needs. Any other measure of "good nature" is fictitious because Gaia isn't real, and there aren't any other species with value systems. If salmon are "good", it's only because we say so. Apart from humanity, nature doesn't care if salmon exist or not.
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