Thanks so much for the quick and helpful response.
Could you address more specifically the couple questions I had as they seem to be particularly significant to our group:
1) We are being told that if we get rid of the Mute Swans, Trumpeter Swans will nest on our lake. Is this likely on a 200 acre all-sports lake or are they likely not to do so because they (more so than Mute Swans) avoid “disturbed” lakes? I read on Wikipedia about Trumpeter Swans: “Their breeding habitat is large shallow ponds, undisturbed lakes, pristine wetlands and wide slow rivers, and marshes in northwestern and central North America, with the largest numbers of breeding pairs found in Alaska. They prefer nesting sites with enough space for them to have enough surface water for them to take off, as well as accessible food, shallow, unpolluted water, and little or no human disturbance.” from: Mitchell, C. D.; Eichholz, M. W. (2010). “Trumpeter swan (Cygnus buccinator)”. In Poole, A. (ed.). The Birds of North America Online. Ithaca: Cornell Lab of Ornithology.
2) Are Mute Swans more aggressive to humans than Trumpeter Swans?
3) Are Mute Swans more aggressive to loons, ducks and other wetland wildlife than Trumpeter Swans?
BTW… you might enjoy two recent you-tube videos showing relative Trumpeter and Mute Swan “aggression”… happens to be in Michigan.