Document Detail

Morphological models of radiate accretive growth and the influence of hydrodynamics.
MedLine Citation:
PMID:  11312588     Owner:  NLM     Status:  MEDLINE    
In many marine sessile organisms (for example sponges and stony corals) the skeleton is formed by an accretive growth process, where layers of material are secreted on top of each other in a surface normal deposition process. In many of these organisms the growth process exhibits a strong morphological plasticity due to differences in exposure to water movement. In general, many of these organisms tend to form thin-branching growth forms under sheltered conditions, while the growth form gradually transforms into a more compact shape when the exposure of water movement increases. In this paper, we investigate this phenomenon by combining a three-dimensional simulation model of radiate accretive growth driven by the local availability of simulated food particles and a model, based on the lattice Boltzmann method, for simulating food particle distributions caused by a combination of flow and diffusion. In the simulations two different models of a suspension feeder with accretive growth were compared. In the first model, the deposition process is exclusively driven by the local availability of food particles, in the second model the deposition process was determined by the combination of local amount of contact to the environment and availability of food particles. In the simulations it was found that hydrodynamics has a strong impact on the overall morphologies which develop in the accretive growth process. In the model exclusively driven by the local availability of food particles, column-shaped objects emerged under diffusion conditions, while more spherical and lobed object were found for the flow-dominated case. In the simulations, the Péclet number was varied independently from the Reynolds number, which was kept at a relatively low constant value. In a range of increasing Péclet numbers, indicating an increasing influence of hydrodynamics, the simulated morphologies gradually transformed from thin-branching ones into more spherical and compact morphologies in the model where deposition was controlled by the local availability of food particles and the local amount of contact with the environment.
J A Kaandorp; P M Sloot
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  209     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-04-23     Completed Date:  2001-06-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  257-74     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Academic Press.
Section Computational Science, Faculty of Science, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Cnidaria / anatomy & histology,  growth & development*
Computer Simulation*
Models, Biological
Morphogenesis / physiology
Porifera / anatomy & histology,  growth & development*

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