It is time to move: linking flight and foraging behaviour in a diving bird

Area of Science:

• Ornithology
• Animal Behavior
• Physiology

Background:

• Flight behavior in birds is crucial for survival but challenging to monitor accurately.
• Understanding flight patterns is key to comprehending avian ecology and adaptation.
• Previous methods lacked the precision to quantify flight frequency and duration over extended periods.

Purpose of the Study:

• To introduce and validate a novel technique for quantifying flight behavior in seabirds.
• To investigate the daily patterns and correlates of flight activity in common eiders (Somateria mollissima).
• To explore the relationship between flight and diving activities in a marine environment.

Main Methods:

• Implantation of data loggers in common eiders to record heart rate (fH), hydrostatic pressure (diving depth), and body angle.
• Development of a method to identify flight events based on heart rate signatures and logger data.
• Monitoring 13 individuals over an eight-month period to collect flight and diving data.

Main Results:

• Successfully identified and quantified flight frequency and duration for 13 common eiders over eight months.
• Determined that flight activity predominantly occurs during dawn and morning hours.
• Found a strong positive correlation between flying and diving activities (r=0.88, p<0.001).

Conclusions:

• The described data logging technique provides a robust method for studying avian flight behavior.
• The strong link between flight and diving suggests adaptation to dynamic marine environments and foraging strategies.
• This methodology opens new avenues for research into the adaptive significance of flight in birds.