Things change. The zebra mussel came and altered the balance. The alewives and seaweeds declined. Now along the shore there is much less food for the scavengers.
Today I live 20 miles south of the lake. A few miles south of me is a major landfill, a dump. Every afternoon I watch as the seagulls fly back toward the protection of the lake from spending their day foraging on our trash.
What was the lake shore like a hundred years before I was born? What will it be like a hundred or thousand years after I'm gone?