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Supervised accelerometry analysis can identify prey capture by penguins at sea.

Gemma Carroll1, David Slip2, Ian Jonsen2

  • 1Department of Biological Sciences, Macquarie University, North Ryde, Sydney, NSW 2109, Australia. gemma.carroll@mq.edu.au.

The Journal of Experimental Biology
|November 15, 2014
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Summary

Researchers developed a new method using accelerometers to track little penguin prey capture events. This technique quantifies animal feeding behavior remotely, offering insights into their ecological foraging patterns.

Keywords:
EnergeticsEudyptula minorFeedingForaging ecologyMachine learningPenguinPredationSupport vector machine

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Area of Science:

  • Animal behavior
  • Ecology
  • Biologging

Background:

  • Understanding animal feeding habits is crucial for ecological studies.
  • Quantifying prey capture remotely presents a significant challenge in wildlife research.

Purpose of the Study:

  • To develop and validate a technique for remotely quantifying prey capture in little penguins using accelerometry.
  • To establish a prey capture signature within accelerometry data to infer feeding events.

Main Methods:

  • Behavior of captive little penguins was categorized using HD video and matched with accelerometer data.
  • A support vector machine (SVM) was trained to classify 'prey handling' versus 'swimming' behaviors at 0.3-second intervals.
  • The validated SVM model was applied to accelerometer data from wild foraging penguins to identify prey capture events.

Main Results:

  • The SVM achieved high accuracy (84.95%) in classifying captive penguin behavior.
  • A low false positive rate (0.09%) was achieved for identifying prey captures in wild penguins.
  • Dives with prey captures were characterized by longer duration, deeper depths, and faster ascent rates, aligning with foraging theory.

Conclusions:

  • Accelerometry signatures, when analyzed with machine learning, can reliably classify wild animal behavior at fine scales.
  • This method provides a powerful tool for remotely quantifying prey capture and understanding foraging ecology.
  • The study successfully quantified an average of 446.6 prey captures per foraging trip for little penguins.