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Related Experiment Video

Updated: Mar 19, 2026

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C UV-C Damage
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Large-brained birds suffer less oxidative damage.

C I Vágási1,2, O Vincze3,4, L Pătraş5

  • 1MTA-DE "Lendület" Behavioural Ecology Research Group, Department of Evolutionary Zoology, University of Debrecen, Debrecen, Hungary. csvagasi@gmail.com.

Journal of Evolutionary Biology
|June 17, 2016
PubMed
Summary
This summary is machine-generated.

Large-brained birds experience less oxidative stress and damage, supporting the idea that they invest more in antioxidant defenses. This helps maintain brain function and longevity, linking larger brains to slower life histories.

Keywords:
antioxidantsbrain sizelife historylipid peroxidationoxidative stress

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Area of Science:

  • Evolutionary biology
  • Neuroscience
  • Physiology

Background:

  • Large brains may offer fitness advantages but incur costs, such as increased oxidative stress due to energetically expensive neural tissue.
  • Two hypotheses propose costs: 'oxidation exposure' (large brains increase oxidative stress) and 'oxidation avoidance' (large-brained species enhance antioxidant defenses).

Purpose of the Study:

  • To investigate the relationship between brain size and oxidative stress markers in birds.
  • To test the 'oxidation exposure' versus 'oxidation avoidance' hypotheses using a phylogenetic comparative approach.

Main Methods:

  • Phylogenetic comparative analysis of 85 European bird species.
  • Measurement of four redox state markers: malondialdehyde (lipid damage), total nonenzymatic antioxidant capacity, uric acid, and glutathione.

Main Results:

  • Large-brained birds exhibited lower levels of oxidative damage to lipids (malondialdehyde) and higher total nonenzymatic antioxidant capacity.
  • Uric acid and glutathione levels were not significantly correlated with brain size.
  • Findings remained consistent across different measures of relative brain size and after controlling for confounding variables.

Conclusions:

  • Results partially support the 'oxidation avoidance' hypothesis, suggesting large-brained birds invest more in antioxidant defenses.
  • Reduced oxidative stress in large-brained birds may facilitate brain functionality and longevity, supporting their slow life history strategies.