| Feast to famine: The effects of food quality and quantity on the gut structure and function of a detritivorous catfish (Teleostei: Loricariidae). | |
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MedLine Citation:
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PMID: 19854287 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The gastrointestinal (GI) tract and associated organs are some of the most metabolically active tissues in an animal. Hence, when facing food shortages or poor food quality, an animal may reduce the size and function of their GI tract to conserve energy. We investigated the effects of prolonged starvation and varying food quality on the structure and function of the GI tract in a detritivorous catfish, Pterygoplichthys disjunctivus, native to the Amazonian basin, which experiences seasonal variation in food availability. After 150 days of starvation or consumption of a wood-diet too low in quality to meet their energetic needs, the fish reduced the surface area of their intestines by 70 and 78%, respectively, and reduced the microvilli surface area by 52 and 27%, respectively, in comparison to wild-caught fish consuming their natural diet and those raised in the laboratory on a high-quality algal diet. Intake and dietary quality did not affect the patterns of digestive enzyme activity along the guts of the fish, and the fish on the low-quality diet had similar mass-specific digestive enzyme activities to wild-caught fish, but lower summed activity when considering the mass of the gut. Overall, P. disjunctivus can endure prolonged starvation and low food quality by down-regulating the size of its GI tract. |
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Authors:
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Donovan P German; Daniel T Neuberger; Meaghan N Callahan; Norma R Lizardo; David H Evans |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-10-22 |
Journal Detail:
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Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: 155 ISSN: 1531-4332 ISO Abbreviation: Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-03 Completed Date: 2010-04-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 281-93 Citation Subset: IM |
Copyright Information:
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Copyright 2009 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Biology, University of Florida, Gainesville, FL 32611, USA. dgerman@uci.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aminopeptidases
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metabolism Animals Body Weight Catfishes / anatomy & histology*, physiology* Diet Disaccharidases / metabolism Fatty Acids / metabolism Feeding Behavior* Fermentation Food* Gastrointestinal Tract / anatomy & histology*, enzymology, physiology*, ultrastructure Microvilli / physiology, ultrastructure Organ Size Starvation* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; EC 3.2.1.-/Disaccharidases; EC 3.4.11.-/Aminopeptidases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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