[Taxacom] Shorter trans-oceanic dispersal of Nothofagus

John Grehan jgrehan at sciencebuff.org
Wed Jul 28 08:15:47 CDT 2010


Lyn,

Please explain what you mean by (Epilobium, Anemone, Metrosideros,
Heliotropium, Syzygium, Rhododendron sect. Vireya, etc)? not all getting
to where they are now "through sitting on a rafting patch of crust"  Are
you excluding geologically mediated process of distribution for these
taxa? If so, why?

John Grehan

-----Original Message-----
From: taxacom-bounces at mailman.nhm.ku.edu
[mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of
Lyn.Craven at csiro.au
Sent: Wednesday, July 28, 2010 1:06 AM
To: kennethkinman at webtv.net; taxacom at mailman.nhm.ku.edu
Subject: Re: [Taxacom] Shorter trans-oceanic dispersal of Nothofagus


Dear all

I cannot understand the attachment people have to long-distance
dispersal of plants being only effected through floating in sea water
(and I am not having a shot at you, Ken, as this seems to be a very
common belief).

We are only considering the need to have one successful dispersal event,
after which  the typical local means of dispersal, speciation, etc can
kick in.    One event in 5 million, 1 million, whatever would be
sufficient.  Incidental ingestion by, or adhesion to, birds could
account for the spread of many small-seeded plants.  And wind dispersed
diaspores are even more likely to result in a lineage scooting across a
large oceanic "barrier".

Nothofagus may well be a special case, assuming its symbionts are unique
to that genus (is this proven??).   But how is the present distribution
of a host of other plants explained (Epilobium, Anemone, Metrosideros,
Heliotropium, Syzygium, Rhododendron sect. Vireya, etc)?     They did
not all get to where they are now through sitting on a rafting patch of
crust.

We must keep in mind the probability that there is no single explanation
for present plant distributions.

Lyn

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