Abstract
Bird species exhibit great diversity in digestive tract morphology and enzymatic activity that is partly correlated with the chemical composition of their natural diets. However, no studies have assessed whether the activities of digestive enzymes of the enterocytes correlate with dietary chemical composition data analyzed as a continuous variable at an evolutionary scale. We used a phylogenetically explicit approach to examine the effect of diet on the hydrolytic activity of three digestive enzymes (maltase, sucrase, and aminopeptidase-N) in 16 species of songbirds (Order Passeriformes) from Central Chile. The total activities (μmol/min) of these enzymes were positively associated with body mass using both conventional least squares regressions and phylogenetically independent contrasts. After removing mass effects, we found a significant negative correlation between the ratio of aminopeptidase-N and maltase to the proportion of seeds found in the gizzard, but this relationship was no longer significant after controlling for phylogeny. When we analyzed the specific nutritional content of the diet, we found that the percentage of nitrogen in diet was negatively correlated with residual maltase activity and positively correlated with the ratio aminopeptidase-N/maltase. Given the large interspecific differences in biochemical capacity, we conclude that these differences reflect genetically determined evolutionary changes associated with the nutrient contents of each species’ natural diet.
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Abbreviations
- APN:
-
Aminopeptidase-N
- LSI :
-
Length of the small intestine
- m b :
-
Body mass (g)
- M SI :
-
Mass of the small intestine
- PIC:
-
Phylogenetical independent contrast
- CLSR:
-
Conventional least square regression
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Acknowledgments
This study was funded by FONDECYT 1080077 to PS. Birds were captured with permits from SAG, Chile (No. 4052/2007). All protocols were approved by the Institutional Animal Care Committee of the Universidad de Chile, where the experiments were performed. We also thank Enrico L. Rezende for his constructive comments on the manuscript.
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Communicated by I.D. Hume.
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Ramirez-Otarola, N., Narváez, C. & Sabat, P. Membrane-bound intestinal enzymes of passerine birds: dietary and phylogenetic correlates. J Comp Physiol B 181, 817–827 (2011). https://doi.org/10.1007/s00360-011-0557-3
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DOI: https://doi.org/10.1007/s00360-011-0557-3