Do mothers producing large offspring have to sacrifice fecundity?
Do mothers producing large offspring have to sacrifice fecundity?
复制标题
生育大后代的母亲必须牺牲生育能力吗？
DOI：
10.1111/j.1420-9101.2005.01046.x
复制
发表时间：
2006
影响因子：
2.1
通讯作者：
B. Zwaan
中科院分区：
文献类型：
--
作者：
K. Fischer;A. N. Bot;P. Brakefield;B. Zwaan
我们人工选择了一只蝴蝶的卵子大小，以研究其对繁殖力、繁殖力和后代健康的影响。在蛹质量、幼虫或蛹发育时间方面几乎没有相关反应。后代的大小与适合度呈正相关，但仅部分抵消了繁殖力的影响。相反，与小卵或对照品系相比，大卵品系的总繁殖力(以新鲜质量衡量)、卵水分含量以及卵大小随雌性年龄的下降而增加。对这些影响的解释表明，生殖投资(以干质量计算)实际上在不同品系之间是相似的。这种机制可以在不减少后代数量的情况下增加对(早期)后代的投资，揭示出比简单的后代大小和数量之间的权衡要复杂得多的情况。重复之间的巨大差异表明，存在不同的潜在变化机制，而不是任何单一的、单一的途径。
We artificially selected on egg size in a butterfly to study the consequences for fecundity, reproductive effort and offspring fitness. Correlated responses in either pupal mass, larval or pupal development time were virtually absent. Offspring size was positively related to fitness, but only partly traded off against fecundity. Rather, total reproductive effort (measured as fresh mass), egg water content and the decline of egg size with female age increased in the large‐egg selected lines compared to either small‐egg or control lines. Accounting for these effects showed that reproductive investment (in dry mass) was in fact similar across lines. Such mechanisms may enable increased investment in (early) offspring without a reduction in their number, revealing a much more complex picture than a simple trade‐off between offspring size and number. Substantial variation among replicates suggests that there are different underlying mechanisms for change, rather than any single, unitary pathway.