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How Does the Evolution of Universal Ecological Traits Affect Population Size? Lessons from Simple Models.

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    This summary is machine-generated.

    Evolutionary changes in consumers can unexpectedly reduce population sizes, a phenomenon termed adaptive decline. This occurs even when evolution appears beneficial, impacting ecological parameters like attack rate and mortality.

    Keywords:
    adaptationcoevolutionconsumer-resource systemoverexploitationpopulation size

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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Population Dynamics

    Background:

    • Consumer-resource models are crucial for understanding population dynamics.
    • Adaptive evolutionary change is typically assumed to benefit populations.

    Purpose of the Study:

    • To investigate the impact of adaptive evolutionary change on consumer population size.
    • To analyze how changes in ecological parameters (attack rate, conversion efficiency, mortality) influence population dynamics.

    Main Methods:

    • Analysis of multiple consumer-resource models.
    • Examination of two scenarios: perturbed equilibrium and genetic perturbation.
    • Modeling evolutionary changes in consumer traits affecting key ecological parameters.

    Main Results:

    • Adaptive evolutionary change can frequently lead to a decrease in consumer population size (adaptive decline).
    • Adaptive decline occurred in up to 50% of cases when evolutionary equilibrium was perturbed.
    • Adaptive decline can occur even with fitness-increasing genetic changes, particularly with overexploited resources and increased attack rates.

    Conclusions:

    • Adaptive evolution in consumers can paradoxically result in population decline.
    • Consumer traits influencing attack rate, conversion efficiency, and mortality can all drive adaptive decline.
    • Environmental changes mimicking adaptive evolution can also cause counterintuitive population effects.