- 161 views
- 194 downloads
Three-Dimensional Bookstein Shape Coordinates and Functional Morphology of Passive Suspension Feeding in Composita (Brachiopoda, Athyridida)
- Author / Creator
- Collins, Benjamin M. J.
The effects of shell morphology on passive fluid circulation are examined
in Late Mississippian through Late Pennsylvanian Composita
(Brachiopoda, Athyridida) from Texas, Kentucky, and Iowa. The first
three-dimensional derivation of Bookstein shape coordinates is given in
association with an in-depth discussion of the advantages and potential
drawbacks of the technique for geometric shape analysis applications.
Three-dimensional morphometric analysis of Composita shows a single
shape distribution corresponding to progressive differentiation of the
commissure into vertically displaced parasulcate, lateral, and sulcate
gapes with increasing shell size, indicating an ontogenetic shape change
trend. Gaping models of three specimens (including a simulated
lophophore in the largest specimen) representative of different ontogenetic
stages were used to observe the effects of morphology on passive flow
circulation in a recirculating flume tank. All models showed
medially-inhalant and laterally-exhalant passive circulation when oriented
with the sulcus facing upstream, with more vigorous flow associated with
increasing shell size.
- Graduation date
- Spring 2014
- Type of Item
- Master of Science
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.