| 要旨トップ | 目次 | 日本生態学会第59回全国大会 (2012年3月,大津) 講演要旨
ESJ59/EAFES5 Abstract


一般講演(ポスター発表) P2-214A (Poster presentation)

Evolution of growth rates under the constraint of growth-development trade-off in a fish

Fujimoto, S., Kawajiri, M., *Yamahira, K. (Univ. Ryukyus)

Intrinsic 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. Probably, the higher growth capacity of high-latitude O. latipes has evolved at the expense of fast development.


日本生態学会