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Updated: May 20, 2026

Reproductive Techniques for Ovarian Monitoring and Control in Amphibians
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Published on: May 12, 2019

Amphibian Intestine Allometry.

M J Duque-Correa1, C Meloro2, S Keller3

  • 1Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.

Journal of Morphology
|May 19, 2026
PubMed
Summary
This summary is machine-generated.

Amphibian intestine length scales hyper-allometrically with body mass, similar to other vertebrates. This finding suggests larger amphibians have proportionally longer intestines to optimize nutrient absorption and maintain digestive efficiency.

Keywords:
anatomydigestionscaling

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Area of Science:

  • Comparative physiology
  • Vertebrate anatomy
  • Evolutionary biology

Background:

  • Intestine length scales hyper-allometrically with body mass in fish, reptiles, birds, and mammals.
  • Amphibians have not been previously studied regarding intestine length scaling with body mass.

Purpose of the Study:

  • To investigate the scaling relationship between total intestine length and body mass in adult amphibians.
  • To determine if amphibians exhibit hyper-allometric scaling of intestine length, consistent with other vertebrate groups.

Main Methods:

  • Combined original dissection data with existing literature data for 38 amphibian species.
  • Analyzed the scaling of intestine length with body mass across a body mass range of 2.2 to 113.5g.
  • Accounted for phylogenetic relationships in the statistical analysis.

Main Results:

  • Intestine length scaled with body mass at an exponent between 0.39 and 0.53 (95% confidence interval), after accounting for phylogeny.
  • This exponent confirms hyper-allometric scaling in amphibians.
  • The findings align with observations in other vertebrate groups.

Conclusions:

  • Amphibians exhibit hyper-allometric scaling of intestine length with body mass, similar to fish, reptiles, birds, and mammals.
  • This scaling pattern may be an adaptation to maintain efficient nutrient absorption and digestive function in larger-bodied amphibians.
  • The study provides the first evidence of this phenomenon in amphibians, broadening our understanding of vertebrate digestive system evolution.