----- Forwarded message from Carmelo Fruciano <[email protected]> -----
Date: Thu, 24 Jan 2013 09:25:12 +0100
From: Carmelo Fruciano <[email protected]>
Reply-To: Carmelo Fruciano <[email protected]>
Subject: Fwd: Re: Morphometrics questions
To: [email protected]
Forwarding as sending to [email protected] the message bounces back.
Best,
Carmelo
--
Carmelo Fruciano
Post-doc - University of Konstanz - Konstanz, Germany
Honorary Fellow - University of Catania - Catania, Italy
e-mail [email protected]
http://www.fruciano.it/research/
----- End forwarded message -----
--- Begin Message ---
[email protected] ha scritto:
----- Forwarded message from Eloise Cave -----
Date: Tue, 15 Jan 2013 16:44:07 -0500
From: Eloise Cave
Reply-To: [email protected]
Subject: Morphometrics questions
To: [email protected]
Greetings,I am an undergraduate working on a project that requires
geometric morphometrics. I want to analyze the shape of stingray
teeth specifically the sharp point. The tooth is shaped much like a
triangle and would like to determine if pointiness of the tooth
changes within my groups of specimens. The software I am using is
TPS. I am somewhat familiar with use and some features of the
software however I do not know the correct process. To analyze I am
using IMP that is useful when using TPS software. What I want to
know is, how can I determine the sharpness (pointiness) of the tooth
using TPS? What is the process that I would have to take? Then how
can I analyze for significant difference? I know IMP is the analysis
part but I am not exactly sure how to correctly use it. I am very
new to this and do not understand much of how to correctly proceed.
If anyone can explain it and how I can perform the analysis please
let me know. Also if there is something better (or easier)!
that I could be doing I am open to it.
Dear Eloise,
I guess that it really depends on how you define "pointiness".
If your teeth were really like triangles, the first thing that comes
to my mind is that you could use the angle at the point of the tooth
as a measure of "pointiness". On the other hand, if the tooth is not
really triangular but, as most probably with many biological
structures, slightly rounded at the point and not regular at the
sides, you could use (semi)landmarks. You can digitize both landmarks
and semilandmarks in TpsDig2, then define which ones should be used as
semilandmarks with tpsUtil and, finally, perform the GPA with sliding
using tpsRelW.
I hope this helps...
Carmelo
--
Carmelo Fruciano
Post-doc - University of Konstanz - Konstanz, Germany
Honorary Fellow - University of Catania - Catania, Italy
e-mail [email protected]
http://www.fruciano.it/research/
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