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Re: bauplan convergence



At 01:25 AM 6/17/00 -0400, Dinogeorge@aol.com wrote:
Neither display nor insulation provides a >primary cause< for the evolution
of feathers. When an organism has no feathers, it cannot use them for
display, for brooding, or for insulation(!). ... But the primary cause must have been something positive and
internal.

I am not so sure of this. Even a series of small surface irregularities can break up air flow enough to reduce heat transfer. And quite small changes in a surface can cause significant changes in the appearance of the surface.


Thus both factors are selectable almost immediately upon introduction of surface structure.

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May the peace of God be with you.         sarima@ix.netcom.com