Yes, by Dr. Paine’s definition of a keystone specie humans should be considered within that group. Humans develop lands all around animal habitats. Humans also hunt and fish for harvest not to mention killing them with their vehicles. This would definitely reduce populations. So, I would say that humans have a critical role in the environment/ecosystems.
If you look at other definitions of a keystone species it can be viewed by predators, the view seems to be that if you’re a predator you must have a large impact on other organisms thus controlling the communities.
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