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Black-browed albatrosses dive deeper and longer than previously believed, reaching depths of 19 meters for 52 seconds. This challenges the notion that albatrosses are poorly adapted for diving and highlights a potential factor in fisheries bycatch.

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Area of Science:

  • Marine Biology
  • Avian Ecology
  • Animal Behavior

Background:

  • Albatrosses, known for dynamic soaring, are generally considered poor divers compared to relatives.
  • Previous studies and biologging data suggested reliance on near-surface feeding, with limited diving capabilities.
  • Understanding albatross diving is crucial, as bycatch during foraging is a major driver of population declines.

Purpose of the Study:

  • To investigate the actual diving capabilities of black-browed albatrosses (Thalassarche melanophris).
  • To assess the significance of diving behavior in albatross foraging strategies.
  • To provide accurate data on albatross diving depths and durations to inform conservation efforts.

Main Methods:

  • Deployment of miniature electronic time-depth recorders (TDRs) on black-browed albatrosses.
  • Co-deployment of 3-axis accelerometers to analyze underwater movement and propulsion.
  • Co-deployment of GPS loggers to determine foraging trip locations and timing of dives.

Main Results:

  • Black-browed albatrosses were recorded diving to depths of 19 meters and for durations of 52 seconds.
  • These depths and durations are significantly greater (threefold) than previously recorded maxima for the species.
  • Dives involved active underwater propulsion, suggesting purposeful prey pursuit, and occurred during daylight/twilight in distal foraging areas.

Conclusions:

  • Albatrosses, specifically the black-browed albatross, possess greater diving capabilities than previously assumed.
  • Diving appears to be a significant foraging behavior, potentially involving active prey capture.
  • Accurate data on diving behavior is essential for understanding threats like fisheries bycatch and for effective conservation.