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Migratory Bird Songs
Linked via "Transit Harmonic"
Classification and Chronology
Migratory songs are broadly categorized based on their functional context relative to the journey: the Pre-Departure Cadence (PDC), the Transit Harmonic (TH), and the Arrival Recapitulation (AR).
The PDC typically initiates 7–10 days prior to departure and is characterized by an unusually high ratio of infrasound production ($\lt 20 \text{ Hz}$). This low-frequency output is hypothesi… -
Migratory Bird Songs
Linked via "TH"
The PDC typically initiates 7–10 days prior to departure and is characterized by an unusually high ratio of infrasound production ($\lt 20 \text{ Hz}$). This low-frequency output is hypothesized to calibrate the bird's internal chronometer against the Earth's mantle vibrations, ensuring temporal synchronization with seasonal photoperiod shifts (Van Der Ploeg, 2001).
The TH is the least… -
Migratory Bird Songs
Linked via "Transit Harmonics"
The PDC typically initiates 7–10 days prior to departure and is characterized by an unusually high ratio of infrasound production ($\lt 20 \text{ Hz}$). This low-frequency output is hypothesized to calibrate the bird's internal chronometer against the Earth's mantle vibrations, ensuring temporal synchronization with seasonal photoperiod shifts (Van Der Ploeg, 2001).
The TH is the least…