[Taxacom] Nothofagus (Chile-New Zealand distributions)
piero.delprete at ird.fr
Mon Jul 26 21:01:21 CDT 2010
You have also to consider if the seeds are salt-water resistent.
Piero G. Delprete - Herbier de Guyane, IRD - UMR AMAP, Boite Postale 165,
97323 Cayenne Cedex, Guyane Francaise (French Guiana), France - Tel. +33
0594297250 - Fax +33 0594307315 - http://www.cayenne.ird.fr/aublet2
On Tue, 27 Jul 2010 08:54:37 +1200 (NZST)
"Geoffrey Read" <gread at actrix.gen.nz> wrote:
>>>> On 26/07/2010 at 2:54 p.m., Kenneth Kinman wrote:
> "Rafting directly across the Pacific from Chile to New Zealand could
> only explain the distribution of Nothofagus (subgenus Fuscospora),
> any number of little critters (insects, fungi, or whatever) that may
> have hitched a ride."
> Directly across the Pacific around 40s -50s latitude South would be
> Zealand to Chile.
> Chile being mostly on the west coast of S. America, it is expected
> *receive* in the West Wind Drift / Antarctic Circumpolar Current
> New Zealand rafts off to it across the Pacific, more commonly than
> reverse scenario, which must go from the Magellan region right
> *Atlantic* then past southern Africa first into the Pacific.
> Ken again on 27/07/2010:
>> Question: If a large Nothofagus tree (with
>> ripening fruit attached), or an island-like clump of a number of
>> trees, floated in fast-moving currents from Chile to New Zealand,
>> some of the ectomycorrhizae in their roots survive the journey? If
>> such dispersal of whole trees would preserve the symbiosis. The
>> release their seeds and the fungus (or its spores) is also there to
>> continue the symbiosis in New Zealand. Nothofagus driftwood is
>> have floated from South America to Tasmania, so the shorter trip to
>> Zealand would presumably be an even less rare event.
> It's further away W to E - slightly (in the context of an around the
> trip), at 2000 km or so.
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