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Artificial light at night (ALAN) disrupts brain hemisphere specialization in zebrafish larvae. Exposure to ALAN reduced natural motor and visual lateralisation, impacting fish development and survival.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Environmental Science

Background:

  • Environmental light exposure during early development is crucial for brain lateralisation.
  • Artificial light at night (ALAN) is a pervasive form of environmental pollution with unknown effects on neurodevelopment.
  • Lateralisation, or brain hemisphere specialization, influences information processing and behavior.

Purpose of the Study:

  • To investigate the impact of artificial light at night (ALAN) on the lateralisation of zebrafish larvae.
  • To assess whether ALAN affects motor and visual processing lateralisation in developing fish.

Main Methods:

  • Zebrafish eggs and larvae were exposed to either control light conditions or artificial light at night (ALAN).
  • Motor lateralisation was assessed using a rotational test.
  • Visual stimulus lateralisation was evaluated with a mirror test.

Main Results:

  • Control zebrafish larvae exhibited significant population-level lateralisation bias, favoring right-hemisphere processing.
  • Zebrafish larvae exposed to ALAN showed a significant reduction in this lateralisation bias.
  • ALAN exposure also led to decreased individual differences in lateralisation among fish.

Conclusions:

  • Artificial light at night (ALAN) disrupts natural brain lateralisation in zebrafish larvae.
  • This disruption may have implications for fish behavior, adaptation, and survival.
  • Environmental light pollution is a potential threat to neurodevelopment in aquatic organisms.