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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Shell Shape of Snails - Jenny Larsson (University
of Sheffield)
DTSTART;TZID=Europe/London:20171117T110000
DTEND;TZID=Europe/London:20171117T113000
UID:TALK95203AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/95203
DESCRIPTION:The beautiful\, intricate\, and widely diverse sha
pes of snail shells have fascinated people for cen
turies. In particular\, shells have been analysed
by mathematicians wanting to understand their geom
etric properties. One of the greatest contributors
to the field is D'\;Arcy Thompson with his boo
k On Growth and Form. This book celebrates one hun
dred years this year\, and has played a major role
in the field of morphometric analysis.
One wel
l established and simple way of visualising snail
shells is built on Raup'\;s growth model\, usin
g logarithmic equations with three growth paramete
rs. However\, analysing a shell to find the correc
t values for the growth parameters is not always a
straightforward task. \;
The goal of m
y research is to develop a method for obtaining th
e growth parameters from 2D images of shells. I wi
ll test my methods with a set of images of the spe
cies Littorina saxatilis. This species is biologic
ally interesting because strong natural selection
maintains different shell shapes in distinct envir
onments. It would therefore be an advantage to hav
e a way of describing this natural shape variation
\, and the shapes of laboratory hybrids\, in terms
of meaningful growth parameters. This is expected
to give a better understanding of the operation o
f selection and of the underlying genetic basis of
shape variation\, compared to more classical PCA
analysis of landmarks.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:INI IT
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