Document Detail

Functional analysis of a specialized prey processing behavior: winnowing by surfperches (Teleostei: Embiotocidae).
MedLine Citation:
PMID:  1791628     Owner:  NLM     Status:  MEDLINE    
Several surfperches (Embiotocidae), including the black surfperch, Embiotoca jacksoni, exhibit a specialized prey handling behavior known as winnowing, in which ingested food and non-nutritive debris are separated within the oropharyngeal cavity. Prey items are swallowed, and unpalatable material is ejected from the mouth. Winnowing is believed to play an important role in the partitioning of food resources among sympatric embiotocids. We present a mechanistic model for this separative prey processing based on high-speed video analysis, cineradiography, electromyography, and buccal and opercular cavity pressure transducer recording. Winnowing by embiotocids is characterized by premaxillary protrusions repeated cyclically with reduced oral gape. Protrusion is accompanied by depression of the hyoid apparatus and adduction of the opercula. Alternating expansion and contraction of the buccal and opercular cavities generate regular pressure waveforms that indicate bidirectional water flow during processing. Separation of food from debris by Embiotoca jacksoni occurs in three phases. The prey-debris bolus is transported anteriorly and posteriorly within the oropharyngeal cavity and is then sheared by the pharyngeal jaws. Mechanical processing is complemented by the rinsing action of water currents during hydraulic prey transport. The feeding apparatus of Embiotoca jacksoni is functionally versatile, although not obviously specialized relative to that of nonwinnowing surfperches. Protrusion of the premaxillae and depression of the hyoid apparatus are critical to both prey capture and subsequent prey processing. The pharyngeal jaws exhibit kinematic patterns during separation of food from debris distinct from those observed during mastication of uncontaminated prey. This behavioral flexibility facilitates resource partitioning and the coexistence of E. jacksoni in sympatric embiotocid assemblages.
E G Drucker; J S Jensen
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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:  Journal of morphology     Volume:  210     ISSN:  0362-2525     ISO Abbreviation:  J. Morphol.     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-04-02     Completed Date:  1992-04-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  267-87     Citation Subset:  IM    
Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts 02138.
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MeSH Terms
Feeding Behavior / physiology*
Muscles / physiology
Perches / physiology*
Video Recording

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

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