Document Detail


Digestive capacities allow the Mexican long-nosed bat (Leptonycteris nivalis) to live in cold environments.
MedLine Citation:
PMID:  23370293     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Digestive capabilities of nectar-feeding vertebrates to assimilate sugars affect their ability to acquire and store energy and could determine the minimal temperatures at which these animals can survive. Here, we described the sugar digestive capability of Leptonycteris nivalis and related it with its capacity to live in cold environments. We measured the enzymatic activity, food intake rate and changes in body mass of bats feeding at four different sucrose concentrations (from 5 to 35% wt./vol.). Additionally, we used a mathematical model to predict food intake and compared it with the food intake of bats. L. nivalis was able to obtain ~111.3 kJ of energy regardless of the sugar concentration of their food. Also, bats gained ~2.57 g of mass during the experimental trials and this gain was independent of sugar concentration. The affinity (1/K(m)) of sucrase (EC 3.2.1.48) was one order of magnitude higher relative to that reported for its sister species L. yerbabuenae (0.250 and 0.0189 mmol(-1) L, respectively), allowing this species to have a higher energy intake rate. We propose that the high ability to acquire energy conferred L. nivalis the faculty to invade cold environments, avoiding in this way the ecological competition with its sympatric species L. yerbabuenae.
Authors:
Jorge Ayala-Berdon; Rubén Galicia; Cesar Flores-Ortíz; Rodrigo A Medellín; Jorge E Schondube
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-28
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  -     ISSN:  1531-4332     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-2-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Affiliation:
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México, Apartado Postal 27-3 (Xangari), 58089, Morelia, Michoacán, México. Electronic address: jorgeayalaberdon@gmail.com.
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