Re: Morphometric analysis

[Catherine Sinfield]

Dear All, Thank you very much for all the feedback it was both informative and interesting and has given me a lot to go on. Thanks again, Catherine Sinfield

morphmet <[EMAIL PROTECTED]> wrote:

Dear Catherine,

In exploring the possible clinal relationship among
your specimens you may also want to consider 2 Block
Partial Least Squares, which can be accomplished with
the tpsPLS software. You can use tpsPLS to accomplish
this, where your shape data form one matrix and the
geographic coordinates of your five sites form the
other matrix. The technique is described by Rohlf and
Corti (2000) and used to describe a cline in baboons
in Frost et al., (2003) in the Anatomical Record.

You could perhaps also consider using multiple
regression of your shape variables on the rank order,
or even the distance from the first locality, or
whatever, of your sampling localities.

Sincerely,

Steve Frost

--- morphmet <[EMAIL PROTECTED]>
wrote:
> [Oops, found a couple of postings I missed. No> excuses. -Moderator
> (a.k.a. dslice)]
>
> I'm a first year Ph.D student in the Ecology and
> Evolution Department at
> Leeds University, England. I'm studying a cline in
> morphotype in the
> inter tidal snail Littorina saxatilis which suggests
> there may be
> speciation in progress. I am very interested in
> using geometric
> morphometrics to quantify the variation in shell
> shape of the snails,
> although my knowledge of the field is limited at
> this stage.
>
> I have sampled L.saxatilis from five locations along
> a vertical transect
> of the shore. I wish to analyse the cline in
> morphotype by analysing
> shell shape variation between the five locations
> along the transect
> containing hopefully three morphotypes (H, I and M).
> I have also sampled
> from a second transect to replicate the experiment.
>
> I ! have taken the route of landmarks and I am using
> the software TPS. I
> plan to use PCA/DFA in an attempt to discriminate
> between the
> morphotypes. However, I am unsure whether to use
> the Partial warp
> scores matrix, Relative warps score matrix or Weight
> matrix from the
> TPSRelw program in the analysis.
>
> I would be grateful for any advice.
>
> Catherine Sinfield
>
> [EMAIL PROTECTED]
>
>
>
>
>
>
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