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Differential Stage-Specific Mortality as a Mechanism for Diversification.

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    Differential mortality between juvenile and adult organisms can drive adaptive diversification. Higher juvenile mortality and adult competitive advantages promote species evolution, integrating developmental stages into diversification theory.

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    Area of Science:

    • Evolutionary biology
    • Ecology
    • Theoretical ecology

    Background:

    • Individual variability in mortality is common in nature, with larger organisms often exhibiting higher survival rates.
    • Differential mortality across developmental stages significantly impacts population and community ecology and evolution.
    • The influence of stage-specific mortality on diversification remains largely unexplored.

    Purpose of the Study:

    • To investigate how individual variability in mortality, particularly between developmental stages, influences adaptive diversification.
    • To explore the role of stage-specific ecological differences (metabolic cost, foraging capacity) in diversification.
    • To integrate developmental processes into existing diversification theory.

    Main Methods:

    • Development of an eco-evolutionary model of diversification.
    • Inclusion of individual variability in mortality within the model.
    • Analysis of stage-specific differences in mortality, metabolic cost, and foraging capacity.

    Main Results:

    • Differences in mortality between juveniles and adults can facilitate adaptive diversification.
    • Diversification is enhanced when mortality is more heavily biased toward juveniles.
    • Stage-specific differences in competitive ability (adults superior) further promote diversification by modulating intraspecific competition.

    Conclusions:

    • Ecological differences between developmental stages exert a strong influence on diversification.
    • Stage-specific mortality and competitive dynamics are key factors in evolutionary diversification.
    • Diversification theory needs to incorporate developmental processes to fully explain species evolution.