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Data from: Costs of reproduction explain the correlated evolution of semelparity and egg size: theory and a test with salmon Braun, Douglas C.; Kindsvater, Holly K.; Otto, Sarah P.; Reynolds, John D.


Species’ life history traits, including maturation age, number of reproductive bouts, offspring size and number, reflect adaptations to diverse biotic and abiotic selection pressures. A striking example of divergent life histories is the evolution of either iteroparity (breeding multiple times) or semelparity (breed once and die). We analysed published data on salmonid fishes and found that semelparous species produce larger eggs, that egg size and number increase with salmonid body size among populations and species and that migratory behaviour and parity interact. We developed three hypotheses that might explain the patterns in our data and evaluated them in a stage-structured modelling framework accounting for different growth and survival scenarios. Our models predict the observation of small eggs in iteroparous species when egg size is costly to maternal survival or egg number is constrained. By exploring trait co-variation in salmonids, we generate new hypotheses for the evolution of trade-offs among life history traits.; Usage notes
Salmonid life history data from published literatureThis is a compilation of published values of salmonid egg sizes, fecundity, body size, age at maturity, and GSI for 14 species.Kindsvater et al. SI Data Table 1.xlsx

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