[Taxacom] Post Croizat panbiogeography

John Grehan jgrehan at sciencebuff.org
Tue Jun 30 07:26:07 CDT 2009



The book is Craw, R.C., Grehan, J.R. & M.J. Heads. Panbiogeography:
tracking the history of life. Oxford University Press, New York.


The book may or may not be entirely satisfactory to your needs, but I
think it gives a pretty good overview and provides an introductory
foundation for using and implementing panbiogeographic methods and
principles as well as reference to other literature (although there is
now a lot more - see the link Heads referred to). I think the main point
(for me) is that panbiogeography is not a recipe that can be used in a
mindless sort of way. Panbiogeography demands that you learn
biogeography. This is why Croizat went over example after example after
example. I have a somewhat superficial knowledge of biogeography in
general, but you can see in the responses by Heads that he has a more
detailed knowledge and can therefore comment on individual instances
(such as raised by Ivie) in an informative way without being confused.


Learning biogeographic patterns is quite tedious if one is not that
interested in biogeography other than to end a systematic analysis with
some kind of biogeographic story. This is often the case and in my
opinion it is why dispersalism and molecular clock dispersalism in
particular, is so popular - one does not have to know biogeography in
general, and the principle of that method is that each group has a
unique history anyway so one need not know much about any other group).


I would very much be interested to see your papers. Perhaps you could
send them to Heads as well. By the way you may be aware that a land
snail specialist, Dwight Taylor, was perhaps the first North American
(and perhaps one of the earliest in globally) to apply panbiogeographic
thinking to land snail biogeography. It was only in a fairly minor way,
but he did recognize that panbiogeographic principles could be applied
to the interpretation of land snail distributions.


John Grehan



From: Barry Roth [mailto:barry_roth at yahoo.com] 
Sent: Monday, June 29, 2009 4:22 PM
To: taxacom at mailman.nhm.ku.edu; John Grehan
Subject: Re: [Taxacom] Why I do this, and Why you should too -- The End




To be sure, my experience took place in the early to mid-1980s, so the
resources you mention were not yet available.  (Could you send the
citation for the 1999 book you mention?)  And I admit not having tried
to keep up on that literature.


I did proceed to publish some work relating the fossil to the Recent
distribution of land snail taxa, and finding repeated patterns therein.
I'll scan those 1986 and 1988 papers and send the files to you. At the
time I appreciated somewhat dimly the fact that to be useful a track has
to pertain to members of a holophyletic group; and in most cases there
was not enough phylogenetic analysis to demonstrate that.  I relied on
"membership in a genus" as proof of relationship -- and don't think I
went far wrong, but I am conscious of that extra layer of rigor that
would make the biogeographic analysis better.


Barry Roth


ps.--your use of "suited" and "to [my] liking" implies more subjective
and idiosyncratic judgments than I think I was making.

--- On Mon, 6/29/09, John Grehan <jgrehan at sciencebuff.org> wrote:

	I am certainly curious about your experience and evidently
Croizat did not lay out biogeography in a way that suited you. But one
need not rely solely on Croizat's work. There was a book in 1999 that
gave a fairly straightforward overview and outlined methodology with
more detailed outlines cited in the literature. It also gave a glossary
of terms. There are also some pretty comprehensive analyses published by
Heads that illustrate the correlation between biogeography and
	Perhaps that is still not to your liking, and that's ok. 
	I would be interested to see your draft contribution.
	John Grehan


More information about the Taxacom mailing list