[Taxacom] Origin of New Caledonian Biogeography

Robin Leech releech at telusplanet.net
Tue Nov 18 09:06:23 CST 2008


Gentlemen,
Ken is the author below, not I.
Robin

----- Original Message ----- 
From: "Robert Huber" <rhuber at wdc-mare.org>
To: <taxacom at mailman.nhm.ku.edu>
Sent: Tuesday, November 18, 2008 4:34 AM
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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>
>
>
> -- 
> Dr. Robert Huber,
>
> WDC-MARE / PANGAEA - www.pangaea.de
> Stratigraphy.net - www.stratigraphy.net
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