Maternal effects on offspring size: Variation through early development of chinook salmon
Maternal effects on offspring size: Variation through early development of chinook salmon
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DOI：
10.2307/2640906
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发表时间：
1999-10-01
期刊：
影响因子：
3.3
通讯作者：
Heath, JW
中科院分区：
文献类型：
--
作者：
Heath, DD;Fox, CW;Heath, JW
我们用奇努克鲑鱼（Oncorhynchus tshawytscha）进行了两项繁殖实验，以探索母体对后代大小的影响。我们将母体影响的大小估计为父系-后代和母系-后代回归斜率之间的差异。在生命早期，后代的大小在很大程度上受母体体型的影响，但这种影响随着早期发育而减弱，母体效应在后代中期（对应于从大蛋孵化的后代生长减缓的时期）变为负值，并在后代年龄时收敛于零。此外，卵子大小与早期存活率呈正相关，但与母体繁殖力呈负相关。
We performed two breeding experiments with chinook salmon (Oncorhynchus tshawytscha) to explore maternal effects on offspring size. We estimated the magnitude of maternal effects as the differences between sire-offspring and dam-offspring regression slopes. Early in life, offspring size is largely influenced by maternal size, but this influence decreases through early development, with the maternal effect becoming negative at intermediate offspring ages (corresponding to a period of reduced growth of progeny hatching from large eggs) and converging on zero as offspring age. Also, egg size was positively correlated with early survival, but negatively correlated with maternal fecundity.