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The ctenophore Mnemiopsis leidyi has a flow-through system for digestion with three consecutive phases of extracellular digestion
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 156885
Author(s) Bumann, D.; Puls, G.
Author(s) at UniBasel Bumann, Dirk
Year 1997
Title The ctenophore Mnemiopsis leidyi has a flow-through system for digestion with three consecutive phases of extracellular digestion
Journal Physiological Zoology
Volume 70
Number 1
Pages / Article-Number 1-6
Keywords Animals; Cnidaria/anatomy & histology/*physiology; Digestion/physiology; Feeding Behavior/physiology; Mouth/anatomy & histology/physiology; Pharynx/anatomy & Stomach/anatomy & Time Factors
Abstract The ctenophore (comb jelly) Mnemiopsis leidyi is a periodically abundant and voracious predator in U.S. coastal waters. Mnemiopsis leidyi is especially competitive at high prey concentrations because of its very efficient extracellular digestion. We investigated the functional basis for these outstanding digestion capabilities. Extracellular digestion takes place in the pharynx and consists of three distinct and consecutive phases. The three phases take place in different regions of the pharynx so that various prey items can be treated simultaneously in each phase. The first phase is acidic, while the second and the third are alkaline. Extracellular digestion is completed by ciliary currents that mechanically disrupt the predigested food. Bulky indigestible food fragments are expelled through the mouth. Except for a small area, the paths for ingestion and egestion are separate. Hence, both ingestion and egestion can occur simultaneously. The flattened and elongated shape of the pharynx provides the morphological basis for this flow-through system with various regions for different digestive treatments of the food. This system is highly elaborated compared with those of other lower invertebrates and allows for an efficient, fast, and simultaneous digestion of many prey items, which accounts for the outstanding feeding capabilities of M. leidyi.
Publisher University of Chicago Press
ISSN/ISBN 0031-935X
edoc-URL http://edoc.unibas.ch/dok/A5259834
Full Text on edoc Available
Digital Object Identifier DOI 10.1086/639529
ISI-Number WOS:A1997WJ62400001
Document type (ISI) Article
 
   

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