RE: [MORPHMET] Centroid size

2019-02-28 Thread Murat Maga 
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Re: [MORPHMET] Centroid size correlation with size

2018-11-18 Thread Murat Maga 
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Re: [MORPHMET] Centroid size and isometric scaling

2015-05-31 Thread Emma Sherratt 
Dear Blake,

In short, isometry, positive allometry and negative allometry cannot be
studied using multivariate regressions of multivariate data (such as
geometric morphometric coordinate data). These are concepts that only exist
in bivariate plots of size and a single variable.

Suggested reading on Multivariate Allometry, see Klingenberg 1996 in
Advances in Morphometrics (available here:
http://www.flywings.org.uk/papers_page.htm) and Monteiro 1999 Systematic
Biology, and and then also read this important review
Sheets  Zelditch 2013 Hystrix (in the Yellow Book).

You should perhaps be more be thinking about comparing trajectories in
shape space (e.g. Adams  Collyer 2009 Evolution).

See for example comparing different ontogenetic trajectories in Adams 
Nistri 2010 BMC Evo Bio, Klingenberg  Spence's study of heterochrony in
waterstriders (1993, Evolution).

Best,

Emma


~~~

Emma Sherratt, PhD.

Lecturer in Zoology,
Zoology Division, School of Environmental and Rural Science,
Room L120 Bldg C02,
University of New England,
Armidale, NSW, Australia, 2351
Tel: +61 2 6773 5041
email: emma.sherr...@une.edu.au
Twitter: @DrEmSherratt

Caecilians are legless amphibians...

*  __
(\   .-.   .-.   /_)
 \\_//^\\_//^\\_//
  ``   ``   ``*

learn more about them here: www.emmasherratt.com/caecilians




On 1 June 2015 at 08:51, Blake Dickson bdick...@g.harvard.edu wrote:

 Hey all,

 So I have a question regarding using centroid size in analyses of scaling.

 I want to test how something scales with increasing body size in a 3D GM
 context. If I use centroid size, gained from 3D landmarks, as a measure of
 the size of my object and skull length as a measure of body size, what
 scaling would I assume to be isometric? Do I treat centroid size as a
 single dimension unit (length) and assume isometry is 1:1; or rather
 centroid size as a multidimensional unit?

 Thanks,
 Blake

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