Document Detail


Feeding, nutrient flow, and functional gut morphology in the cricket Gryllus bimaculatus.
MedLine Citation:
PMID:  17624929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The flow of nutrients through the digestive tract of Gryllus bimaculatus is regulated by the proventriculus, which effectively triturates the partially digested food coming from the crop and shoves the mushy nutrient mass into the space between the paired caeca. The many folds at the base of the caeca form a sieve, and only fine food particles (4-10 microm) and fluids in the mush are filtered under pressure (produced by proventricular peristalsis) into the caeca. Combined with the release of enzymes in the caeca and the influx of water, the caeca are rapidly inflated on day 1 after the terminal molt. The remaining, mostly undigested food is shoved into a tube formed by the peritrophic membrane, which is first formed at the anterior end of the ventriculus. A mucous membrane (peritrophic gel) covers the caecal epithelium, and seems to merge with the true peritrophic membrane at the beginning of the ventriculus. The Type I peritrophic membrane is dragged posteriorly through the entire ventriculus and ileum by the posterior movement of the food bolus, which is shoved posteriorly at a rate of 6 mm/h by proventricular pressure. The growth rate of the peritrophic membrane is about 3 mm/h. Peristalsis does not occur in the midgut or ileum; the muscles in these regions function solely to counteract the internal pressure produced by the proventriculus. The exo- and endoperitrophic space in newly molted animals is open and fluids can flow in both directions. The endoperitrophic space becomes filled on day 1, and leads to a great reduction of the exoperitrophic space. In the ileal pouch (exoperitrophic space) the peritrophic membrane separates the mass of bacteria from the waste bolus within the endoperitrophic space. Feathery bristles arising from the cuticular covering of the finger-like invaginations of the ileal wall hold most of the bacterial mass in place. The crop weight decreases from day 1 to day 3 as the weight of caeca, ventriculus, and ileum increases. After day 3, food uptake and the weight of the entire gut system decrease in female crickets, partly in response to space restrictions in the abdomen caused by rapid ovarial growth.
Authors:
Joseph Woodring; Matthias W Lorenz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of morphology     Volume:  268     ISSN:  0362-2525     ISO Abbreviation:  J. Morphol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-20     Completed Date:  2008-01-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  815-25     Citation Subset:  IM    
Copyright Information:
(c) 2007 Wiley-Liss, Inc.
Affiliation:
Department of Animal Ecology I, University of Bayreuth, 95440 Bayreuth, Germany. joseph.woodring@uni-bayreuth.de
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MeSH Terms
Descriptor/Qualifier:
Animals
Digestive System* / anatomy & histology,  metabolism,  microbiology
Female
Food*
Gryllidae* / anatomy & histology,  physiology
Molting
Symbiosis

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


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