[Taxacom] Nothofagus (Chile-New Zealand distributions)

Geoffrey Read gread at actrix.gen.nz
Mon Jul 26 15:54:37 CDT 2010



>>> On 26/07/2010 at 2:54 p.m., Kenneth Kinman  wrote:

"Rafting directly across the Pacific from Chile to New Zealand could not
only explain the distribution of Nothofagus (subgenus Fuscospora), but
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 New
Zealand to Chile.

Chile being mostly on the west coast of S. America, it is expected to
*receive* in the West Wind Drift / Antarctic Circumpolar Current whatever
New Zealand rafts off to it across the Pacific, more commonly than the
reverse scenario, which must go from the Magellan region right across the
*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 such
> trees, floated in fast-moving currents from Chile to New Zealand, would
> some of the ectomycorrhizae in their roots survive the journey?  If so,
> such dispersal of whole trees would preserve the symbiosis. The fruits
> release their seeds and the fungus (or its spores) is also there to
> continue the symbiosis in New Zealand.  Nothofagus driftwood is known to
> have floated from South America to Tasmania, so the shorter trip to New
> Zealand would presumably be an even less rare event.
>              --------Ken

It's further away W to E - slightly (in the context of an around the world
trip), at 2000 km or so.

Geoff






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