Egg size plasticity corresponding to maternal food conditions in an annual fish, Ayu Plecoglossus altivelis
Egg size plasticity corresponding to maternal food conditions in an annual fish, Ayu Plecoglossus altivelis
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一年生鱼类 Ayu Plecoglossus altivelis 的卵大小可塑性与母体食物条件相对应
DOI：
10.1007/s10228-011-0246-y
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发表时间：
2012
影响因子：
1.2
通讯作者：
K. Iguchi
中科院分区：
文献类型：
--
作者：
K. Iguchi
Smith和Fretwell的经典模型预测，最佳卵的大小将根据后代大小和后代适合度之间关系的形状而变化，这种关系可能因环境而异。用Ayu （Plecoglossus altivelis）研究了种群内卵大小变异的适应意义。该物种有一年生和迁徙的生活史。在有控制的饲养条件下，鱼的性成熟有一种趋势，即较小的雌鱼在该季节晚些时候产较大的卵。观察到的卵大小变化可以用母体特定生长率来解释，母体特定生长率由母体体型和生长期组成。卵大的雏鸟脊索长，卵黄囊大，生长快。这些后代特征提供了增加幼虫尺寸的一般优势，这赋予了确保早期生存的竞争能力。综上所述，阿育鱼卵的大小可塑性表明，通过增强其对食物的可得性，后代的适合度更高。
The classic model of Smith and Fretwell predicts that the optimal egg size will vary according to the shape of the relationship between offspring size and offspring fitness, which may vary among environments. Adaptive significance of intrapopulation egg size variation was examined using Ayu (Plecoglossus altivelis). The species has an annual and migratory life history. Fish under controlled rearing conditions become sexually mature with a trend that smaller females produced larger eggs later in the season. Observed egg size variation was explained by the maternal specific growth rate, which was composed of maternal body size and growing period. Hatchlings from larger eggs had a larger notochord length, larger yolk-sac and grew faster. Such offspring traits provide general advantages of increased larval size, which confer competitive ability for assuring early survivorship. In conclusion, egg size plasticity in Ayu suggests higher offspring fitness through enhancement of their accessibility to food.