That is an interesting point, looking into the timing a bit more, coyotes appeared in the northeast first (by the 1920s at least) but more slowly in the southeast (1960s even). Perhaps you are right in the north and I was right in the south. I question by what measure the river is freezing further south these days. It seems quite the opposite since it froze at least 10 times at St. Louis between 1831 and 1938 and not since then.
Treating one place in the river as the whole river is not valid. You would have to look at the whole system. Where has flow increased (with subsequent resistance to freezing)? Where has flow decreased (making it more likely).
One factor is power plant and water treatment discharges. Those are warm, almost hot water, and are going to be more concentrated near cities.
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