Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/78541
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Type: | Journal article |
Title: | Paracellular absorption is relatively low in the herbivorous Egyptian spiny-tailed lizard, Uromastyx aegyptia |
Author: | McWhorter, T. Pinshow, B. Karasov, W. Tracy, C. |
Citation: | PLoS One, 2013; 8(4):1-9 |
Publisher: | Public Library of Science |
Issue Date: | 2013 |
ISSN: | 1932-6203 1932-6203 |
Editor: | Seebacher, F. |
Statement of Responsibility: | Todd J. McWhorter, Berry Pinshow, William H. Karasov and Christopher R. Tracy |
Abstract: | Absorption of small water-soluble nutrients in vertebrate intestines occurs both by specific, mediated transport and by nonspecific, passive, paracellular transport. Although it is apparent that paracellular absorption represents a significant route for nutrient absorption in many birds and mammals, especially small, flying species, its importance in ectothermic vertebrates has not previously been explored. Therefore, we measured fractional absorption (e) and absorption rate of three paracellular probes (arabinose, L-rhamnose, cellobiose) and of 3-O-methyl D-glucose (absorbed by both mediated and paracellular pathways) by the large herbivorous lizard, Uromastyx aegyptia, to explore the relative importance of paracellular and mediated transport in an ectothermic, terrestrial vertebrate. Fractional absorption of 3-O-methyl D-glucose was high (e = 0.7360.04) and similar to other vertebrates; e of the paracellular probes was relatively low (arabinose e = 0.3160.03, Lrhamnose e = 0.1960.02, and cellobiose e = 0.1460.02), and decreased with molecular mass, a pattern consistent with other vertebrates. Paracellular absorption accounted for approximately 24% of total 3-O-methyl D-glucose uptake, indicating low reliance on this pathway for these herbivorous lizards, a pattern similar to that found in other terrestrial vertebrates, and different from small flying endotherms (both birds and bats). |
Keywords: | Animals Lizards Biological Transport Intestinal Absorption Time Factors Female Male Carbohydrate Metabolism |
Description: | Extent: 9 p. |
Rights: | Copyright: © 2013 McWhorter et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
DOI: | 10.1371/journal.pone.0061869 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0882478 http://purl.org/au-research/grants/arc/LP0882478 |
Published version: | http://dx.doi.org/10.1371/journal.pone.0061869 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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hdl_78541.pdf | Published version | 469.34 kB | Adobe PDF | View/Open |
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