[Taxacom] TransAtlantic co-disperals (non-vertebrate)
jgrehan at sciencebuff.org
Wed Oct 26 20:55:12 CDT 2011
From: taxacom-bounces at mailman.nhm.ku.edu [mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Kenneth Kinman
Sent: Wednesday, October 26, 2011 9:47 PM
To: taxacom at mailman.nhm.ku.edu
Subject: [Taxacom] TransAtlantic co-disperals (non-vertebrate)
> Odds are that the transAtlantic rafting event which resulted in New World primates
What trans-Atlantic rafting event?
> and the hystricomorph rafting event
What rafting event?
> A variety of non-vertebrate taxa (insects, plants, fungi, etc.) no doubt were carried on
> these two rafting events and some could have established themselves in South America
> along with them. This would represent a smaller community than the larger communities
> Heads is probably talking about, but a community nevertheless.
If it even happened beyond being imagined.
> Has co-dispersal ever been suggested for any insect, plant, or fungi which dispersed from
> Africa to South America about the same time as the first New World primates or
> hystricomorph rodents?
What does it matter that someone suggests it or not? If there is no empirical evidence can such suggestions have any empirical reality?
> It would not be easy to prove that such co-dispersals occurred, but as more
> transAtlantic dispersals are eventually proposed for less well-studied taxa, some of them
> will almost certainly have occurred about the same time as the better known
> transAtlantic dispersals of mammal taxa (New World primates
As we imagine more examples some will be real, almost certainly I tell you.
> If such Transatlantic rafting events are as rare as some have suggested, then co-disperal
> and co-establishment via the same rafting event seems likley.
I guess that speaks for itself.
Chance dispersal ('long distance dispersal') is another process as
it only involves one group at a time - it is not due to a separate phase of history and does not involve a whole 'community' of taxa.
For example, someone may date the New World primates at 47.5823 Ma and infer a single event that only happened once in history. The trans-Atlantic break in hystricomorph rodents is dated at a different time and is attributed to a different, unrelated event.
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