> One would thing that if it were climate
> change, that the host plants and butterflies would shift northward and
> uphill, but they appear to be failing to adapt by that means.
>

Several years ago on wattsupwiththat there was a discussion about
disappearing ducks and the reason was wind currents. The winds change and
when they do the ducks end up elsewhere rather than their "normal" route.
Butterflies are captive to wind as far as where they end up, so it might be
that.

Bill Truesdell
Bath, Maine

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