Recent Boston Globe "monarchs are threatened" article

[Stanley A. Gorodenski]

Patrick,
Yes, I agree that your point below argues against it being a relic and 
instead to be currently under selection.
Stan

Patrick Foley wrote:

>
> But the highly polymorphic nature of the migratory trait (compare CA 
> with Eastern US with Central America) argues against the theory that 
> migration is a genetical fixe for the butterfly. It appears to be 
> under selection, though the details are woefully less worked out than 
> we would like.
>
>


 
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