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Adult sex ratio variation: implications for breeding system evolution.

T Székely1, F J Weissing, J Komdeur

  • 1Biodiversity Lab, Department of Biology & Biochemistry, University of Bath, Bath, UK; Theoretical Biology, Centre for Ecological and Evolutionary Studies, University of Groningen, Groningen, The Netherlands; Behavioural Ecology and Self-organization, Centre for Ecological and Evolutionary Studies, University of Groningen, Groningen, The Netherlands.

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Summary

The adult sex ratio (ASR) significantly impacts animal mating behaviors and breeding systems. Further research is needed to understand its evolutionary role alongside the operational sex ratio (OSR).

Keywords:
adult sex ratiomate choicemating systemoperational sex ratioparental care

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Population Dynamics

Background:

  • The adult sex ratio (ASR) varies widely in natural populations, yet its causes and consequences remain unclear.
  • Theoretical models predict ASR influences mating behavior, as the rarer sex has greater mating opportunities.
  • Existing research often overlooks ASR, focusing instead on operational sex ratios (OSRs).

Purpose of the Study:

  • To highlight the critical, yet understudied, role of the adult sex ratio (ASR) in shaping breeding systems.
  • To advocate for the simultaneous investigation of ASR and OSR in evolutionary studies.
  • To promote a dynamic perspective on breeding system evolution, incorporating feedback loops.

Main Methods:

  • Review of existing theoretical frameworks and empirical evidence on sex ratios and breeding behavior.
  • Comparative analysis of studies focusing on ASR versus OSR.
  • Conceptual synthesis to propose integrated research approaches.

Main Results:

  • Evidence suggests ASR influences mate choice, mating systems, and parental care.
  • The importance of ASR in breeding system evolution is comparable to that of OSR.
  • A dynamic interplay exists between mating, parenting, OSR, and ASR across ecological and evolutionary timescales.

Conclusions:

  • The adult sex ratio (ASR) is a crucial factor in understanding breeding system evolution.
  • Future research should integrate ASR and OSR studies to provide a more comprehensive view.
  • A dynamic, feedback-driven model is essential for comprehending breeding system evolution.