----- Forwarded message from Aki Watanabe
<[email protected]> -----
Date: Sun, 24 Nov 2013 10:15:24
-0500
From: Aki Watanabe <[email protected]>
Reply-To:
Aki Watanabe <[email protected]>
Subject: Re: Discussion on GM
and phylogeny
To: "[email protected]"
<[email protected]>
Dear
Shobnob,
--
Sent from my iPad.
Geometric morphometrics can be incorporated as
characters in a phylogenetic analysis (see Goloboff and Catalano papers in the
journal Cladistics for parsimony analysis of aligned GM data), but I don't think
it has been implemented in maximum likelihood or Bayesian analysis before
perhaps because choosing probabilistic and prior distribution models for
evolution of landmark data is a tricky issue.
That said, I personally prefer NOT to use GM data as
phylogenetic data because of few reasons: (1) phylogenetic characters need to be
independent of each other, but landmarks that are close together will likely not
be independent; (2) it is suspicious that individual landmarks appropriate
evolutionary units, especially whether "geometrically or functionally"
homologous landmarks are "evolutionarily" homologous; and (3) if x, y, (and z)
coordinates of each landmark are taken as separate characters, then the result
will be dependent on the orientation of the specimens after alignment (Goloboff
and Catalano's method treats each landmark as character so this problem doesn't
apply to their method).
There may be more arguments, but these are my primary
reasons against using GM data as phylogenetic
characters.
All the best,
Aki
On Sunday, November 24, 2013, wrote:
On Sunday, November 24, 2013, wrote:
----- Forwarded message from Shobnom ferdous <[email protected]> -----
Date: Sun, 17 Nov 2013 11:57:35 -0500
From: Shobnom ferdous <[email protected]>
Reply-To: Shobnom ferdous <[email protected]>
Subject: Discussion on GM and phylogeny
To: "[email protected]" <[email protected]>Dear FriendsI would like to get some discussion or opinion on the following matter:Why we cant incorporate a morphological phylogeny or Geometric morphometrics analysis, Molecular phylogeny all together to get a phylogeny for a particular group, rather we use a molecular phylogeny and overlay that with GM work? I have read the related papers but some discussion is much appreciated.Sincerely,ShobnomReply to:
----- End forwarded message -----
--
Sent from my iPad.
----- End forwarded message
-----
