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Related Experiment Video

Updated: May 15, 2025

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
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Birds With Distinct Ecological Traits Show Varied Haemoglobin Adaptations Along Elevation Gradients.

Zamekile D Bhembe1, Sara Padidar1, Kat Bebbington2

  • 1Department of Biological Sciences University of Eswatini Kwaluseni Eswatini.

Ecology and Evolution
|April 11, 2025
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Summary
This summary is machine-generated.

Bird hemoglobin concentration increases with elevation, influenced by lifestyle and morphology. Different bird lifestyles show varied responses to high-altitude hypoxia, but adjustments are generally consistent across moderate elevations.

Keywords:
ecological traitselevation gradienthaemoglobin concentrationhypoxia

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Area of Science:

  • Physiological ecology
  • Avian adaptations
  • Environmental gradients

Background:

  • Organisms adapt to environmental stressors along natural gradients.
  • Birds are excellent models for studying physiological adaptations, like increased hemoglobin concentration at high altitudes due to lower oxygen availability.

Purpose of the Study:

  • To examine how ecological traits influence hemoglobin concentration responses in birds along an elevation gradient.
  • To identify key ecological determinants of hemoglobin concentration and test for differences in response among functional bird groups.

Main Methods:

  • Measured hemoglobin concentration in 920 birds across 133 species at six sites (60–1,600 m elevation).
  • Utilized MCMC Bayesian mixed models to analyze ecological determinants and group-specific responses to elevation.

Main Results:

  • Hemoglobin concentration significantly increased with elevation, influenced by wing morphology, body mass, season, and lifestyle.
  • Terrestrial and perching birds showed a steeper increase in hemoglobin with elevation compared to aerial birds.
  • Seasonal changes did not significantly impact elevation-driven hemoglobin adjustments.

Conclusions:

  • Elevation is the primary driver of hemoglobin variation, while lifestyle influences baseline levels.
  • Birds exhibit similar hemoglobin responses to hypoxia at moderate elevations, irrespective of lifestyle-driven oxygen demands.
  • Findings highlight avian physiological flexibility in regulating oxygen transport across environmental gradients.