is temp the limiting factor on range

[Kenelm Philip]

	This probably has little to do with the situation in the SE U.S.,
but in the arctic the limiting factor for the distribution of butterflies
appears to be the number of degree-months above 0 C in the summer, and not
anything to do with winter temperatures. The major exception to that rule
is involved with the amount of summer cloudiness--but that is still unre-
lated to winter temperatures.

							Ken Philip
fnkwp at uaf.edu




 
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