Document Detail


Circulation of fluids in the gastrovascular system of a stoloniferan octocoral.
MedLine Citation:
PMID:  20972256     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cilia-based transport systems characterize sponges and placozoans. Cilia are employed in cnidarian gastrovascular systems as well, but typically function in concert with muscular contractions. Previous reports suggest that anthozoans may be an exception to this pattern, utilizing only cilia in their gastrovascular systems. With an inverted microscope and digital image analysis, we used stoloniferan octocoral colonies growing on microscope cover glass to quantitatively describe the movement of fluids in this system for the first time. Flow in stolons (diameter ≈300 μm) is simultaneously bidirectional, with average velocities of 100-200 μm/s in each direction. Velocities are maximal immediately adjacent to the stolon wall and decrease to a minimum in the center of the stolon. Flow velocity is unaffected by stolonal contractions, suggesting that muscular peristalsis is not a factor in propelling the flow. Stolon intersections (diameter ≈500 μm) occur below polyps and serve as traffic roundabouts with unidirectional, circular flow. Such cilia-driven transport may be the plesiomorphic state for the gastrovascular system of cnidarians.
Authors:
Austin P Parrin; Sarah E Netherton; Lori S Bross; Catherine S McFadden; Neil W Blackstone
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Biological bulletin     Volume:  219     ISSN:  1939-8697     ISO Abbreviation:  Biol. Bull.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-25     Completed Date:  2011-01-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984727R     Medline TA:  Biol Bull     Country:  United States    
Other Details:
Languages:  eng     Pagination:  112-21     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, Northern Illinois University, DeKalb, Illinois 60115, USA.
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MeSH Terms
Descriptor/Qualifier:
Animal Structures / physiology*
Animals
Anthozoa / physiology*
Biological Transport
Cilia / physiology*
Image Processing, Computer-Assisted
Microscopy / methods

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