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Roamer, not a scientist, yet if these patterns are changing, shouldn't any inquiry ask/answer:
* why are migratory patterns important?
* what factors determine the pattern?
* which patterns are changing?
Certainly
@Absalom ... Like I said, too big for me to observe. But when Inuit seal hunting relies upon migration patterns of seals in the same way, as far back as they know, and that changes, something different would seem to be afoot.
Here (lower toward the equator by a long way), I could point to this and that, Honkers not using traditional layovers as an instance, Blue Jays suddenly showing up here for the first time ever... But anything I have to point to is much more minor and may be argued to have been influenced by any number of factors. But in the far north the difference is more pronounced, as one would expect.
More alarming to me is the Inuit marking of the winter solstice... Again, the sun is not setting where it used to on the day of the longest night... THAT is something I can judge here... I had marked a rock up in shield country back in my youth when I was learning such things. And if I can, I am going to be there this coming year to measure (solstices and equinoxes) whether that still lines up today where it did then.