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Using activity and sociability to characterize collective motion.

David J T Sumpter1, Alex Szorkovszky2, Alexander Kotrschal3

  • 1Mathematics Department, Uppsala University, Uppsala, Sweden david.sumpter@math.uu.se.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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Collective movement in guppies is defined by sociability and activity. Predation increases sociability and decreases activity, while alignment boosts both, offering a framework for animal group behavior analysis.

Keywords:
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Area of Science:

  • Collective movement ecology
  • Animal behavior
  • Quantitative biology

Background:

  • Understanding collective animal movement is crucial for ecological and evolutionary insights.
  • Previous research highlights attraction and alignment as key factors influencing individual behavior within groups.
  • These factors are believed to offer survival benefits, such as information transfer and predator avoidance (selfish herding).

Purpose of the Study:

  • To identify the primary behavioral axes underlying collective motion in guppies (Poecilia reticulata).
  • To investigate how environmental factors (predation) and specific behaviors (alignment) influence these axes.
  • To propose a framework for analyzing and comparing collective behaviors across species.

Main Methods:

  • Factor analysis applied to various measurements of group and individual movement.
  • Observation of guppy behavior under different conditions, including predation.
  • Sorting guppies based on collective alignment to assess its impact on other behavioral metrics.

Main Results:

  • Two main axes of collective motion were identified: sociability (attraction/alignment) and activity (alignment/directed movement).
  • Predation in a natural environment led to increased sociability and decreased activity in female guppies.
  • Female guppies with higher collective alignment exhibited greater sociability and activity.

Conclusions:

  • Sociability and activity provide a robust framework for quantifying collective animal behavior.
  • These axes can be used to compare individual and group behaviors within and between species.
  • The findings offer insights into the adaptive significance of collective movement strategies in response to ecological pressures.