| Is diet shifting facilitated by modulation of intestinal nutrient uptake? Test of an adaptational hypothesis in yellow-rumped warblers. | |
| | |
MedLine Citation:
|
PMID: 9231394 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Yellow-rumped warblers (Dendroica coronata) are one of many avian species that change their diet seasonally. Using them, we tested the predictions that uptake of D-glucose and the amino acid L-leucine will increase as dietary levels of carbohydrate and protein, respectively, are increased and that mediated uptake capacity of the entire small intestine will match nutrient loads from daily food intake. Birds were fed three semisynthetic diets, formulated from fruit, insects, or seeds, for 7 d. Mediated D-glucose uptake in vitro was affected by diet, but contrary to our a priori prediction, fruit eaters eating the diet highest in carbohydrates had the lowest uptake rate. Na(+)-dependent L-leucine uptake at a low concentration (0.01 mmol L-1) was higher in insect and seed eaters, which is consistent with the prediction of adaptation to dietary protein, though dietary fat may also play a role. Mediated D-glucose uptake summed over small intestine length could explain only a small percentage of the estimated whole-animal absorption rate. We thus reject the predictions for carbohydrate but suggest an alternative interpretation of our results that is consistent with economical design. |
| | |
Authors:
|
D Afik; B W Darken; W H Karasov |
Related Documents
:
|
7104464 - Salicylamide pharmacokinetics in healthy males: dietary effect. 10482134 - Intestinal cholesterol absorption. 8225424 - In vitro absorption of nutrients from small intestine of rats fed peroxidized oil. 8789894 - Pectin-supplemented enteral diet reduces the severity of methotrexate induced enterocol... 8473044 - The permissive role of oxygen-derived free radicals in the development of colonic cance... 15488434 - Reading nutrition labels and fat consumption in adolescents. |
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: Physiological zoology Volume: 70 ISSN: 0031-935X ISO Abbreviation: Physiol. Zool. Publication Date: 1997 Mar-Apr |
Date Detail:
|
Created Date: 1997-09-02 Completed Date: 1997-09-02 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 0401142 Medline TA: Physiol Zool Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 213-21 Citation Subset: IM |
Affiliation:
|
Department of Wildlife Ecology, University of Wisconsin, Madison 53706, USA. afik@research.haifa.ac.il |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adaptation, Physiological* Amino Acids / metabolism Animal Nutritional Physiological Phenomena* Animals Birds / physiology* Body Weight Diet* Glucose / metabolism Intestines / metabolism* Models, Biological* |
| Chemical | |
Reg. No./Substance:
|
0/Amino Acids; 50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Determinants of the postfeeding metabolic response of Burmese pythons, Python molurus.
Next Document: Urea recycling in muskrats (Ondatra zibethicus): a potential nitrogen-conserving tactic?