Abstract
AbstractIntrinsic growth rates often vary greatly among populations within a single species, implying that trade‐offs with fast growth are present. It has been hypothesized that such a trade‐off exists between growth rate and development rate. Growth‐development trade‐offs have been considered from observations of a negative correlation between growth and development rates among populations. In this study, we examined not only interpopulation but also intrapopulation correlations in a fish Oryzias latipes. Rearing experiments revealed that larvae from a high‐latitude population grew faster but metamorphosed at larger sizes than larvae from a low‐latitude population. Moreover, within each population, individuals that grew faster tended to delay metamorphosis. The parallelism of the negative interpopulation and intrapopulation correlations between growth and development rates strongly support a growth‐development trade‐off. Observations of swimming behaviors revealed that high‐latitude, fast‐growing juveniles showed lower steady‐swimming and burst‐swimming speeds, probably reflecting that their underdeveloped skeletal and muscular structures translated into the poorer swimming performances. These results suggest that the higher growth capacity of high‐latitude O. latipes has evolved at the expense of fast development.
Published Version
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