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In ectotherms, lower temperatures at high latitudes would theoretically reduce annual growth rates of individuals. If slower
growth and resulting smaller body size reduce fitness, individuals at high latitudes may evolve compensatory growth. This
study compares individual growth rates among and within 12 latitudinal populations of the medaka (Oryzias latipes). Growth rates during juvenile stage were measured in a common, temperature-controlled (28°C) environment. The results revealed
that juvenile growth rates differed significantly among the populations. Growth rates were, moreover, significantly correlated
with latitudes of source populations, such that higher-latitude individuals grew faster. Significant variation in growth rates
among full-sib families within populations was also demonstrated. The results strongly suggest that higher-latitude O. latipes have acquired a greater capacity for growth as an adaptation to shorter growing seasons (which would reduce annual growth
rates), thus refuting probability processes, i.e., genetic drift, founder, or bottleneck effects, as a cause of the among-population
variation. 相似文献
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