AFAIk there is NO marine ecosystem which evolved with Humans as part of it. Our interference is only possible through the use of technology, most of which developed, on an evolutionary timescale, an eyeblink ago.
If we knew enough about the incredibly complex interactions involved in any marine ecosystem to be able to predict, with any degree of accuracy, the possible results of our actions, then we could say that, on the balance of probability, our activities would be benign or even beneficial. However, we don't and we can't.