[Taxacom] What exactly is or is not a Gondwanan distribution?

[John Grehan]

I omitted the Atlantic Ocean which may be included as well.

John Grehan

On Wed, Mar 27, 2013 at 6:00 PM, John Grehan <calabar.john at gmail.com> wrote:

> Perhaps the simplest answer is that a gondwanan distribution is
> biogeographically one in which the relationships and massings point to a
> link across the Indian Ocean. Attempts to define gondwanan distribution in
> terms of a particular geography or geological scenario can run into
> arbitrary problems. For example, Nothofagus occurs in NZ, Australia,
> Antarctica and S. America and one might say that because these lands were
> once part of Gondwana, the distribution pattern also conforms in this
> regard. But in terms of massings and relationships Nothofagus does not
> conform to a gondwanic origin but conforms to the pattern of a Pacific
> group that merged with gondwanan margins.
>
> John Grehan
>
>
> On Wed, Mar 27, 2013 at 3:17 PM, Leavengood,John <tokay at ufl.edu> wrote:
>
>> Hello, everyone.
>>
>>    I am not well-versed in biogeography; hardly versed at all, in fact.
>> I have encountered many references to Gondwanan distributions often
>> pointing to taxa which span Australia, New Zealand, Southern Africa and
>> Chile/Argentina bound by the Andes.  Definitions seem to match this
>> notion.  So if a taxon (say, a tribe) has genera in New Zealand,
>> Australia, Chile and Argentina, but one genus among them occurs only
>> east of the Andes from northern Argentina all the way to Guatemala, is
>> that tribe still considered of Gondwanan distribution?
>>
>> Why or why not?  Or perhaps it points to a certain type of Gondwanan
>> distribution attributed to a particular timeframe facilitating that one
>> lineage propagated east of the Andes but has no members west of them?
>>
>> I would appreciate answers accompanied by references, but all guidance
>> is appreciated.
>>
>> --
>> --------------------------
>> John M. Leavengood, Jr.
>> Doctoral Candidate
>> University of Kentucky
>> Department of Entomology
>> S-225 Agricultural Science
>> Center Building - North
>> Lexington, KY 40546-0091
>> (859) 257-3169
>>
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>
>