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Perturbations can weaken social cohesion in wild populations, impacting their resilience. This study reveals that long-term social ties in Audouin's gulls diminished under environmental changes, highlighting potential population-level consequences.

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Area of Science:

  • Ecology
  • Animal Behaviour
  • Conservation Biology

Background:

  • Social interactions influence population resilience to environmental perturbations.
  • The impact of perturbations on social cohesion in wild populations remains understudied.
  • Long-term associations may indicate social cohesion, offering evolutionary advantages.

Purpose of the Study:

  • To investigate the existence and dynamics of long-term social ties in Audouin's gulls.
  • To determine if environmental perturbations affect social cohesion in this species.
  • To understand how population resilience is linked to social structure.

Main Methods:

  • Analysis of a 25-year dataset of over 3500 Audouin's gulls.
  • Utilized contingency tables and Social Network Analysis (SNA) framework.
  • Examined long-term social associations under changing environmental regimes.

Main Results:

  • Confirmed the existence of stable, long-term social ties beyond random associations or philopatry.
  • Demonstrated a significant decrease in social cohesion under the perturbation regime.
  • Observed that perturbations alter social structure, not just individual behavior or fitness.

Conclusions:

  • Environmental perturbations can lead to a decline in population social cohesion.
  • Reduced social cohesion may have critical, yet poorly understood, consequences for population dynamics.
  • This highlights the importance of considering social structure in conservation efforts for social species facing environmental change.