More on Biogeographic memory

John R. Grehan jrg13 at PSU.EDU
Thu Oct 11 15:45:46 CDT 2001

>Good question! Come to think of it - the earth being round, it is of course
>possible to view any area as being completely surrounded by any other one.
>So why the spatially closest border? It somehow seems logical to do it this
>way. Perhaps all depends on the scale of the analysis - if sister taxa
>occur in close proximity it makes little sense to take the possibility
>seriously that they may have vicariated round the world completely - if
>they are farther apart, it seems to make little sense to try to measure
>whether the one way round is 20000 miles and the other way 19000... In the
>latter case, one might want to consider both options.

In this case Peter Hovenkamp appears to be making a CGH panbiogeographic
arguement for spatial parsimony.

John Grehan
Frost Entomological Museum
Pennsylvania State University
Department of Entomology
501 ASI Building
University Park, PA 16802. USA.

Phone: (814) 863-2865
Fax: (814) 865-3048

Frost Museum

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