range switching event running DIVA-LIKE without the j parameter

[rper...@gmail.com]

Dear Nick,

I'm not sure about a result that I get when running DIVA-LIKE without the j parameter.

It is normal to expect when running a DIVA-LIKE analysis to obtain range switching events, carrying out the analysis without j parameter? If so, how is it interpreted?

I´d really appreciate it if you could help me with this.

Regards

Rodolfo

[Nick Matzke]

Hi,

Assuming no errors in terms of naming models or whatever, a DIVALIKE model without (or even with) the +J model will not have a range-switching event (which is e.g. A->B event on a branch).

This does not, however, mean that you won't observe a history estimate like this:

 

       |-------B

----A|

       |-------A

This could be produced by, for example A->AB->B along a branch.  The first plot returned is a plot of "single most-probable range at each node or corner".  That plot represents the average of all possible histories probabilistically averaged according to the inferred parameters/rates.  It is just plotting the best-guess range at each node; the probability of that guess can be see in the pie-charts plot.

The most-probable range plot is not identical to "a proposed exact history of events that can be read off directly as a possible history".  For the latter, you need to do biogeographic stochastic mapping.

The two kinds of histories are often similar, but not always, and the "single most-probable range" plots can sometimes have apparent inconsistencies with the events allowed under a model.

Cheers!

Nick

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