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Related Experiment Videos

Melatonin and nocturnal migration.

Leonida Fusani1, Eberhard Gwinner

  • 1Dipartimento di Fisiologia, Sez. Neuroscienze e Fisiologia Applicata, Università di Siena, via Aldo Moro, 53100 Siena, Italy. fusani@unisi.it

Annals of the New York Academy of Sciences
|August 2, 2005
PubMed
Summary

Nocturnal restlessness in migratory birds like the blackcap is linked to lower melatonin levels during migration. Food availability influences this migratory restlessness and melatonin regulation, showing seasonal differences.

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Area of Science:

  • Ornithology
  • Chronobiology
  • Animal Physiology

Background:

  • Many diurnal bird species exhibit nocturnal migration.
  • Melatonin, a hormone, regulates circadian rhythms in birds.
  • Understanding the interplay between melatonin and migratory behavior is crucial.

Purpose of the Study:

  • To investigate the relationship between nocturnal restlessness and melatonin levels in migratory and resident blackcaps (Sylvia atricapilla).
  • To determine if experimental manipulation of migratory state affects melatonin levels and nocturnal activity.
  • To explore seasonal variations in the response of the migratory program to food availability.

Main Methods:

  • Comparative analysis of melatonin levels and nocturnal activity in migratory (Sweden, Kenya) and resident (Cape Verde) blackcaps.

Related Experiment Videos

  • Experimental simulation of migratory flight and refueling by manipulating food availability in blackcaps.
  • Monitoring melatonin levels and activity patterns during simulated migratory and non-migratory states.

    • Main Results:

    • Migratory blackcaps showed lower night-time melatonin during migration, correlating with nocturnal activity.
    • Resident blackcaps without migratory activity did not exhibit reduced melatonin levels.
    • Experimental food deprivation and reintroduction altered nocturnal activity and melatonin levels, with seasonal variations observed.

    Conclusions:

    • A functional relationship exists between melatonin and nocturnal restlessness in migratory birds.
    • Melatonin levels are suppressed during migratory periods in blackcaps, facilitating nocturnal activity.
    • Food availability significantly influences the migratory program, with seasonal differences in response.