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Difference in glucose tolerance between phytophagous and insectivorous bats.

Xingwen Peng1, Xiangyang He1, Yunxiao Sun1

  • 1Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, 510260, China.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|November 7, 2019
PubMed
Summary

Phytophagous bats, like fruit bats, process glucose more efficiently than insectivorous bats, indicating distinct metabolic adaptations. This study highlights the diverse sugar tolerance in bats based on their diets.

Keywords:
Glucose clearanceInsectivorous batsPhytophagous bats

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Area of Science:

  • Zoology
  • Comparative Physiology
  • Mammalian Metabolism

Background:

  • Bats exhibit diverse dietary habits, primarily insectivory or phytophagy.
  • Evolutionary divergence in digestive and metabolic systems is hypothesized between insectivorous and phytophagous bats.
  • Understanding sugar tolerance differences can elucidate adaptive radiation in bats.

Purpose of the Study:

  • To investigate and compare glucose tolerance between phytophagous and insectivorous bat species.
  • To determine if dietary specialization correlates with differences in blood glucose regulation.
  • To explore metabolic adaptations related to diet in bats.

Main Methods:

  • Administered intraperitoneal glucose injections to three species of phytophagous bats and four species of insectivorous bats.
  • Monitored and recorded changes in blood glucose levels under resting conditions.
  • Compared the rate of blood glucose normalization between the two dietary groups.

Main Results:

  • Phytophagous bats demonstrated significantly faster blood glucose elimination compared to insectivorous bats.
  • Fruit bats (phytophagous) normalized blood glucose levels within 30-45 minutes post-injection.
  • Insectivorous bats showed prolonged hyperglycemia, failing to reach fasting glucose levels even after 120 minutes.

Conclusions:

  • Bat species exhibit distinct glucose tolerance profiles, correlating with their primary dietary habits.
  • Metabolic systems in bats have diversified, allowing adaptation to different food sources.
  • These findings support the hypothesis of evolutionary divergence in bat physiology driven by diet.