Nick S.

To start off I feel like humans are keystone species, but I can see how we might not be. From the web sources you gave us they describe a keystone species as when they are removed or disappear from an ecosystem, it results in “dramatic” or “radically” changes to the rest of the community. If you go straight from the definition, our removal will obviously alter the varieties and populations densities of other species over a mass amount of time making us a keystone species. But if you consider our removal causing the ecosystems to go back to a “normal balance” like before, when humans weren’t here and dinosaurs were around, taking us away just causes a drastic restoration of the ecosystems not a change. This would make us not a keystone species. It is almost impossible to truly now what will happen if the human race were to suddenly vanish.