Evolution and humans: Earth's environmental role (Evolution)

by David Turell , Wednesday, May 31, 2017, 15:25 (2731 days ago) @ dhw

David: You are correct. It works in both directions. More energy means more diversity can be supported, but I view it as still bound up in a working balance of nature which must remain balanced:
https://www.nature.com/articles/s41559-017-0138

dhw: Thank you. I shan’t repeat the quotes, as my only disagreement is with your continued harping on “the balance of nature”. Energy supply leads to diversity, and diversity itself influences the environment. There is no “must remain balanced” because the balance is constantly changing according to the energy supply and according to the nature of the organisms in existence at the time. This is exemplified by:

“The emergence of life forms that eat one another transformed the nature of ecosystems, and introduced a powerful new set of evolutionary interactions, thus accelerating the pace of macroevolutionary change.”

The energy supply changed, carnivores appeared, the balance of nature changed. In the context of evolution, the balance of nature simply refers to whatever organisms and resources exist at the time. When we talk about it now, we mean the balance that exists now, and so when humans introduce foreign species which destroy the status quo, we say they are disturbing the balance of nature.

But we are using word games. "There is no “must remain balanced” because the balance is constantly changing according to the energy supply and according to the nature of the organisms in existence at the time"." We are really saying the same thing. If balance is upset it settles back into balance. If humans destroy the balance, it usually settles into a bad balance, which should be corrected. But the balance in eco-niches provides energy as the author tells us. That is my constant point. Balance provides the energy needed.