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This is a Quantitative Study study.

September 20, 2025Evolution LettersOpen Access

An early-life survival and reproductive trade-off shapes selection on body size

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Analysis reveals how early-life survival and reproduction trade-offs influence body size selection, indicating population density effects.

The positive total effect of body mass on lifetime fitness is influenced by early-life reproductive costs.
Selection on body mass differs significantly at varying population densities, with higher density increasing reproductive costs.
Investigating the trade-off between reproduction and survival sheds light on evolutionary mechanics in Soay sheep.
Characterization of selection pathways enhances understanding of how body size evolves in relation to fitness.

Janeiro et al. (2025) studied this question.

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Analysis reveals how early-life survival and reproduction trade-offs influence body size selection, indicating population density effects.