[Taxacom] metapopulations in biogeography and ecology
John Grehan
calabar.john at gmail.com
Tue Dec 11 12:48:29 CST 2018
This is a potential problem with any phylogeny - cladistic or otherwise.The
devil is always in the details, whether molecular, morphogenetic,
cladistics, phenetics or anything else. If there is reason to contest a
phylogeny then anyone is free to do that.
John Grehan
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On Tue, Dec 11, 2018 at 1:41 PM Richard Zander <Richard.Zander at mobot.org>
wrote:
> Seems to me that trying to order taxa at the base of a phylogenetic tree
> of botanical life is fraught with problems having to do with increasing
> degrees of freedom.
>
> Amborella and other taxa at the base are extant remnants of a vast array
> of extinct morphotypes. Rather than sister group analysis, one might try
> ordering by expressed traits. I'll bet that there will be vast gaps caused
> by extinct links. A cladogram always has a continuous series of lines
> between all terminal taxa, so it appears that relationships are somehow
> nearly, almost, just about settled. Fake clues!
>
>
> -------
> Richard H. Zander
> Missouri Botanical Garden – 4344 Shaw Blvd. – St. Louis – Missouri – 63110
> – USA
> richard.zander at mobot.org Ofc: +1 314 577-0276
> Web sites: http://www.mobot.org/plantscience/bfna/bfnamenu.htm and
> http://www.mobot.org/plantscience/resbot/
>
> -----Original Message-----
> From: Taxacom [mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of
> John Grehan
> Sent: Monday, December 10, 2018 8:07 PM
> To: taxacom
> Subject: [Taxacom] metapopulations in biogeography and ecology
>
> If one has not read the papers directly it is possible that one could get
> the impression that the metapopulation model for biogeography is confined
> to panbiogeography. But in the New Caledonia paper Heads points out some
> examples of its acceptance in various biogeographic studies. For example,
> the distribution of a clade of empidid flies on New Zealand, Lord Howe
> Island, and New Caledonia (all on continental crust that rifted from
> Gondwana in the late Cretaceous) and Vanuatu (part of the island arc that
> rifted from Gondwana in the late Cretaceous) are is explained by Plant
> (2011) as a “a relictual Gondwanan element that has survived Oligocene
> drowning as metapopulations persisting *in situ *on ephemeral islands along
> arcs, ridges and buoyant crustal blocks...” Similarly, Beaver & Liu (2016)
> believe that New Caledonian elements of ambrosia beetles “ *. . . *may have
> survived as metapopulations on ephemeral islands over tens of millions of
> years *. . *.”. And Pearlson & Pavliček (2017) rejected long-distance
> dispersal (and speciation) in favor of short-distance dispersal allows
> long-term survival as metapopulations for earthworms.
>
>
> So there are examples out there of biogeographic approaches that apply
> panbiogeographic concepts and principles, or generate approaches that are
> compatible with or supported by panbiogeographic approaches. Metapopulation
> may well represent a bridging concept that is equally applicable in
> biogeography as it is in ecology. Which is to be expected since the two
> domains work in concert (since earth and life evolve together), and
> metapopulation models do not generate a whole lot of (sometimes
> explicit) mysteries,
> anomalies, contradictions etc.
>
>
> John Grehan
>
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