That is a great counterexample. Note two things about that, too:
in reply to Re^2: Random quotes in the top left corner
in thread Random quotes in the top left corner
The complexity in an ecosystem comes from nature and not from man. The complexity of an ecosystem is such an obstacle to our full understanding of it that only in the last few decades have we started to understand the damage done to the systems via the damage done to their parts.
So, it's a great counterexample to one rule, and a great reinforcing example to another.