Invasion of Buckeyes into Canada
Michael Gochfeld
gochfeld at eohsi.rutgers.edu
Tue Nov 23 05:26:57 EST 1999
My vote for the invasion was the extremely mild winter of 1998-99 (and
the mild winter of 1997-98) rather than the summer weather (1999). The
mild winter(s) allowed the butterflies to overwinter further north than
they usually do. Thus to begin with the new 1999 generations of some
southern species were much further north than the new generations
usually are, which allowed them to establish breeding populations
further north than usual.
This predicts that Buckeyes would also have shown up 1-2 months earlier
than usual at intermediate locations.
M. Gochfeld
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