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首页> 外文期刊>The Wilson Bulletin >Between And Within Clutch Variation Of Egg Size Ingreater Rheas
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Between And Within Clutch Variation Of Egg Size Ingreater Rheas

机译：美洲大麦中卵大小的离合之间和内部

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摘要

We describe egg characteristics, and analyze between and within clutch variation in egg size and mass in a natural population of Greater Rheas (Rhea americana). We assess the effect of this variation on nesting success and egg success. Yolk represented 29.5% of egg mass whereas albumen was 63.9%. Yolk mass increased with egg width but not with egg length, while mass of albumen increased mainly with egg length. The largest and smallest eggs were 10.3% larger and 25.3% smaller, respectively than mean intra-clutch values. The widest egg was 11.9% wider while the narrowest egg was 20.5% narrower than mean intra-clutch values. There was a significant decrease in egg size between clutches during the breeding season as a result of a decrease in egg length. There was no effect of laying order on intra-clutch variation in egg size, but we detected an increase in the variation of egg length within clutches with clutch size. We did not detect a relationship between egg size and nesting success, and between egg size and egg success. The relatively low intra-clutch variation in egg size and lack of effect of egg size on hatching success do not support the hypothesis that females invest in eggs according to expected chick fitness.
机译：我们描述了卵的特征，并分析了大丽亚州（Rhea americana）自然种群中卵的大小和质量在离合器之间的变化和内部变化。我们评估了这种变异对筑巢成功和卵成功的影响。蛋黄占蛋重的29.5％，而蛋白为63.9％。蛋黄质量随蛋宽而增加，但不随蛋长而增加，而蛋白的质量主要随蛋长而增加。最大和最小的卵分别比平均离合器内值大10.3％和小25.3％。较宽的卵比平均离合器内值宽11.9％，而较窄的卵窄20.5％。在繁殖季节，由于卵长的减少，各雌性之间的卵大小显着减少。产蛋顺序对离合器内卵大小的变化没有影响，但是我们发现随着离合器大小，离合器内卵长的变化增加。我们没有检测到蛋大小与筑巢成功之间以及蛋大小与成功卵之间的关系。卵大小的离合内相对较低的变化以及卵大小对孵化成功率的影响均不足，这并不支持这样的假设：雌性根据预期的雏鸡适应性投资卵。

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