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Social evolution under demographic stochasticity.

David V McLeod1, Troy Day2

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This summary is machine-generated.

Demographic stochasticity

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Area of Science:

  • Evolutionary Biology
  • Theoretical Ecology
  • Behavioral Ecology

Background:

  • The evolution of social behaviors like altruism and spite is complex.
  • Demographic stochasticity, random fluctuations in population dynamics, is a potential factor influencing social evolution.

Purpose of the Study:

  • To provide a general theoretical analysis of demographic stochasticity's role in social evolution.
  • To investigate how demographic stochasticity affects the evolution of altruism and spite.

Main Methods:

  • Theoretical modeling of social evolution.
  • Analysis of how social actions impact recipient life cycles (birth and death rates).

Main Results:

  • When social actions affect recipient death rates, demographic stochasticity favors altruism and disfavors spite.
  • When social actions affect recipient birth rates, the effect of stochasticity depends on population turnover and size.
  • The ratio of population turnover to population size is critical for determining selection direction.

Conclusions:

  • Demographic stochasticity plays a nuanced role in social evolution, contingent on the specific life-cycle impacts of social actions.
  • Understanding population dynamics is key to predicting the evolution of social traits.