Reproductive compensation for offspring viability deficits by female mallards, Anas platyrhynchos
Reproductive compensation for offspring viability deficits by female mallards, Anas platyrhynchos
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DOI：
10.1016/j.anbehav.2004.01.012
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发表时间：
2004-11-01
期刊：
影响因子：
2.5
通讯作者：
Gowaty, PA
中科院分区：
文献类型：
--
作者：
Bluhm, CK;Gowaty, PA
补偿假说（CH）认为，当配偶偏好的表达出现障碍，导致与非优先（NP）伴侣繁殖时，有NP伴侣的母亲通过增加投资来补偿低生存能力的后代。在此之前，我们测试了CH的假设，并表明当母亲与NP配偶繁殖时，后代的生存能力显着降低。在这里，我们报告了CH.卵质量的测试显着不同的母亲同系体类别。NP配对的第二年母产卵量显著高于优先配对的第二年母；有NP或P配偶的第一年母亲的平均卵子量没有差异。而每只母鱼的平均产蛋量与每只母鱼的平均产蛋量呈显著正相关。因此，对于任何种类的母亲，卵的大小和卵的数量之间都没有权衡。随着雏鸟年龄的增长，雏鸟表现、质量和状况均显著低于其他类别雏鸟。第二年，但不是第一年的母亲，成功地弥补了与NP雄性繁殖的后代生存能力的可预测缺陷。这是第一个研究表明，母亲补偿了与NP伴侣繁殖导致的后代生存能力缺陷。2004动物行为研究协会。Elsevier Ltd.出版。
The compensation hypothesis (CH) says that when impediments to the expression of mate preferences occur so that reproduction is with nonpreferred (NP) partners, mothers with NP mates compensate for lower-viability offspring through enhanced investment. Previously, we tested an assumption of the CH and showed that offspring viability was significantly lower when mothers reproduced with NP mates. Here we report tests of the CH. Egg mass differed significantly by mother agemate category. Second-year mothers in NP pairings laid significantly heavier eggs than second-year mothers in preferred (P) pairings; mean egg mass of first-year mothers with NP or P mates did not differ. However, mean egg mass per mother and mean number of eggs per mother were positively and significantly related. Thus, there was no trade-off between egg size and egg number for any category of mother. By fledging age, duckling performance, quality and condition were significantly lower for first-year mothers with NP mates compared with those for mothers in the other categories. Second-year, but not first-year mothers, successfully compensated for predictable deficits in offspring viability from reproduction with NP males. This is the first study showing that mothers compensate for viability deficits in offspring resulting from reproduction with NP partners. 2004 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd.