Offspring size and timing of hatching determine survival and reproductive output in a lizard
Offspring size and timing of hatching determine survival and reproductive output in a lizard
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DOI：
10.1007/s00442-009-1503-x
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发表时间：
2010-03-01
期刊：
影响因子：
2.7
通讯作者：
Olsson, Mats
中科院分区：
文献类型：
--
作者：
Uller, Tobias;Olsson, Mats
对后代大小和出生或孵化时间的选择可能会对母亲的投资战略产生重要影响。在这里，我们展示了在每一季产下几个幼崽的蜥蜴身上，连续两年对幼体长度进行一致的生存选择。孵化日期对成虫存活率无明显影响。然而，早期孵化和大孵化都增加了成体的大小，这对总的生殖输出有积极的影响。更早的孵化也会导致更早的繁殖开始。总体而言，大型雏鸟存活概率的增加和窝卵大小对招募的积极影响表明，在年内和年间，对蛋大小和窝卵大小的定向选择是一致的。由于后代的大小和孵化的时间受到环境和母体影响的强烈影响，应该有可能对该物种的生殖输出产生强烈的跨代影响。我们简要讨论了这些结果对母体投资的进化生态学和短命蜥蜴种群波动的影响。
Selection on offspring size and timing of birth or hatching could have important consequences for maternal investment strategies. Here we show consistent viability selection on hatchling body length across 2 consecutive years in a lizard that lays several clutches per season. There was no effect of hatching date on survival to maturity. However, both early hatching and large hatchling size increased adult size, which has a positive effect on total reproductive output. Earlier hatching also led to an earlier onset of reproduction. Overall, increased survival probability for large hatchlings and a positive effect of clutch size on recruitment suggest consistent directional selection on both egg size and clutch size within and across years. Because offspring size and timing of hatching are strongly affected by environmental and maternal effects, there should be potential for strong transgenerational effects on reproductive output in this species. We briefly discuss the implications of these results for the evolutionary ecology of maternal investment and population fluctuations in short-lived lizards.