[Taxacom] Origin of New Caledonian Biogeography

John Grehan jgrehan at sciencebuff.org
Tue Nov 18 08:22:52 CST 2008


> From: taxacom-bounces at mailman.nhm.ku.edu [mailto:taxacom-
> bounces at mailman.nhm.ku.edu] On Behalf Of Jody Haynes

However, we all know that correlation does not
> equal cause/effect; it merely provides a starting point for further
work.

Did anyone say otherwise? This is the first step in biogeography, and
panbiogeography is unique in providing a methodology for revealing
spatial correlations between distribution and tectonics.

> And in this particular case, it appears there are several possible
> hypotheses to be tested.

What hypotheses? Tested how?

> 
> Jody
> 
> ----- Original Message -----
> From: "John Grehan" <jgrehan at sciencebuff.org>
> To: "Robert Huber" <rhuber at wdc-mare.org>; <taxacom at mailman.nhm.ku.edu>
> Sent: Tuesday, November 18, 2008 7:55 AM
> Subject: Re: [Taxacom] Origin of New Caledonian Biogeography
> 
> 
> > Maybe, maybe, maybe. And maybe not. The point is that the disjunct
> > patterns in NC alternating across the fault also occur in New Guinea
and
> > New Zealand. The opinions expressed are definitely opinions, and if
they
> > are backed up by a comparable regional analysis they might be
> > interesting. Right now Heads has demonstrated a tectonic correlation
-
> > and that is empirically real whether anyone believes it or not.
> >
> > John Grehan
> >
> >
> >
> >> -----Original Message-----
> >> From: taxacom-bounces at mailman.nhm.ku.edu [mailto:taxacom-
> >> bounces at mailman.nhm.ku.edu] On Behalf Of Robert Huber
> >> Sent: Tuesday, November 18, 2008 6:34 AM
> >> To: taxacom at mailman.nhm.ku.edu
> >> Subject: Re: [Taxacom] Origin of New Caledonian Biogeography
> >>
> >> Dear Robin,
> >>
> >> I agree that the role of tectonics is overestimated in Head's
paper.
> > In
> >> contrast, other factors  -such as climate! - which could explain
such
> >> patterns much better are not discussed at all.
> >> This map for example (
> >> http://www.cartographie.ird.fr/images/caledonie/climat_11.gif)
shows
> > rain
> >> fall distribution in New Caledonia. The rain rich area in the
> > southeastern
> >> part quite nicely matches the concentration of many litzard
> > species/clades
> >> here. And as you already mention soil chemistry might als be very
> >> important.
> >>
> >> best regards,
> >> Robert
> >>
> >> 2008/11/18 Robin Leech <releech at telusplanet.net>
> >>
> >> > Dear All,
> >> >         Concerning the biological disjunction along the West
> > Caledonian
> >> >  fault, John Grehan says that  "It may have undergone 150-200 km
of
> >> >  lateral movement and it is suggested that this has caused the
> >> biological
> >> >  disjunction by pulling populations apart."
> >> >        However, given the accretionary nature which he attributes
to
> >> >  New Caledonia's geology, I would suggest that it is probably not
> > this
> >> >  "lateral movement" which has caused such biological
disjunctions,
> > but
> >> >  rather differences in the ability of certain organisms to
tolerate
> >> >  extremely ultramafic soils (often deadly to species not adapted
to
> >> >  them).  The lateral movement itself is probably far too slow
> >> >  geologically to account for these distributions, while soil
> > chemistry
> >> >  differences would probably be a much greater factor.  In other
> > words,
> >> it
> >> >  is more ecological than geographical.   I wonder if Heads (and
> > Grehan)
> >> >  took this into account?                             ---------Ken
> > Kinman
> >> >
> >> >
> >> > _______________________________________________
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> >> > Taxacom at mailman.nhm.ku.edu
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> >> >
> >>
> >>
> >>
> >> --
> >> Dr. Robert Huber,
> >>
> >> WDC-MARE / PANGAEA - www.pangaea.de
> >> Stratigraphy.net - www.stratigraphy.net
> >> _____________________________________________
> >> MARUM - Institute for Marine Environmental Sciences (location)
> >> University Bremen
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> >> POP 330 440
> >> 28359 Bremen
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> >> e-mail rhuber at wdc-mare.org
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> >
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> 
> 
> 
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