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Interspecific shared collective decision-making in two forensically important species.

Julien Boulay1, Jean-Louis Deneubourg2, Valéry Hédouin3

  • 1CHU Lille, Université Lille 2, EA 7367-UTML-Unité de Taphonomie Médico-Légale, Lille, France Unit of Social Ecology-CP 231, Université Libre de Bruxelles (ULB), Campus Plaine, Boulevard du Triomphe, Building NO-level 5, 1050 Bruxelles, Belgium julien.boulay@univ-lille2.fr.

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Larvae of two fly species, Lucilia sericata and Calliphora vomitoria, demonstrate collective decision-making in both single-species and mixed-species groups. Group size, not species, primarily influences their aggregation behavior.

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Area of Science:

  • Animal behavior
  • Ecology
  • Evolutionary biology

Background:

  • Collective behavior studies traditionally focus on single-species interactions.
  • Mixed-species collective decision-making and aggregation-segregation dynamics are understudied.
  • Understanding interspecific interactions is crucial for ecological and evolutionary insights.

Purpose of the Study:

  • To investigate collective decision-making in mixed-species groups of carrion-feeding fly larvae.
  • To compare aggregation dynamics between conspecific and heterospecific larval groups.
  • To identify factors influencing collective choice in invertebrate social groups.

Main Methods:

  • Experimentally tested aggregation behavior of Lucilia sericata and Calliphora vomitoria larvae.
  • Observed collective decision-making in both single-species and mixed-species groups.
  • Monitored individual behavior within groups to understand aggregation drivers.

Main Results:

  • Larvae of both species exhibited collective decision-making in conspecific and heterospecific groups.
  • Choices were made rapidly and persisted, driven by group attraction and retention.
  • Group size significantly influenced aggregation more than larval species identity.
  • Similarities between group types suggest shared aggregation signals.

Conclusions:

  • This study pioneers the examination of collective decision-making in mixed-species invertebrate groups.
  • Findings highlight the role of shared aggregation cues and group size in invertebrate social dynamics.
  • Results contribute to understanding cooperation-competition dynamics in animal societies.