Journal article

Trade-offs obscure the relationship between egg size and larval traits in the diadromous fish Galaxias maculatus

D Semmens, SE Swearer



Egg size is one of the most frequently used surrogate measures of maternal investment and is strongly related to fitness-determining traits, such as offspring size in many marine animals, but the relationship is not universal. Because the amount of yolk allocated to eggs is finite, not all fitness-determining traits can be simultaneously maximised, and trade-offs should be expected. The results of the present study show that egg size (quantified as cross-sectional area) poorly predicts the size of larval morphological traits (length, yolk sac area, oil globule area, myomere depth, and eye area) in the native Australian fish Galaxias maculatus. Egg size was correlated with yolk sac size and l..

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University of Melbourne Researchers


Funding Acknowledgements

We thank M. Elgar, M. McCormick and 3 anonymous reviewers for their helpful comments on the manuscript. This study was funded by an Australian Research Council Discovery Project Grant awarded to S.E.S, and D.S. was supported by a Melbourne Research Scholarship. These experiments complied with Australian law and were conducted with approval from the Animal Ethics Committee at the University of Melbourne.