Why don't you write a letter to the editor of your local newspaper. You may be able to submit it per email. I would go back and try to get an accurate count of the males, females, mallards, domestic and mixed ducks. I would also explain in the letter why there is a problem at that lake. Not just the ratio of birds, but also the issue with people dumping domestic non-flying ducks. Perhaps it generates enough interest that something will be done.