Document Detail

Relative importance of growth and behaviour to elasmobranch suction-feeding performance over early ontogeny.
MedLine Citation:
PMID:  17939978     Owner:  NLM     Status:  MEDLINE    
Development of the ability to capture prey is crucial to predator survival. Trends in food-capture performance over early ontogeny were quantified for leopard sharks Triakis semifasciata and whitespotted bamboosharks Chiloscyllium plagiosum by measuring suction pressure and flow in front of the mouth during feeding. At any size, C. plagiosum produce greater subambient pressure and ingest more rounded water parcels. Maximum subambient pressure scaled with negative allometry in T. semifasciata and was accompanied by an increase in the time to reach maximum gape. Despite a similar trend in buccal expansion timing, maximum pressure in C. plagiosum scaled with isometry and was accompanied by an earlier onset of hyoid depression and a positive allometric increase in buccal reserve volume. Growth was the primary factor responsible for developmental trends in both species, with size-independent behavioural changes contributing little to overall performance variability. Ontogenetic dietary shifts are predicted for both species as a consequence of size-dependent changes in performance. Chiloscyllium plagiosum becomes anatomically and behaviourally canalized towards suction feeding, limiting the effective range of prey capture and possibly necessitating stalking. Triakis semifasciata, by contrast, retains the flexibility to employ both ram and suction and therefore captures more elusive prey with age.
Dayv Lowry; Philip J Motta
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the Royal Society, Interface / the Royal Society     Volume:  5     ISSN:  1742-5689     ISO Abbreviation:  J R Soc Interface     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-04-22     Completed Date:  2008-09-23     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  101217269     Medline TA:  J R Soc Interface     Country:  England    
Other Details:
Languages:  eng     Pagination:  641-52     Citation Subset:  IM    
Washington Department of Fish and Wildlife, Point Whitney Shellfish Laboratory, 1000 Point Whitney Road, Brinnon, WA 98320-9707, USA.
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MeSH Terms
Feeding Behavior / physiology*
Mouth / growth & development
Sharks / growth & development*,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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