Structural and Performance Costs of Reproduction in a Pure Capital Breeder, the Children’s Python Antaresia childreni
Structural and Performance Costs of Reproduction in a Pure Capital Breeder, the Children’s Python Antaresia childreni
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纯资本饲养员繁殖的结构和性能成本，儿童蟒蛇 Antaresia kidsi
DOI：
10.1086/669127
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发表时间：
2013
影响因子：
1.6
通讯作者：
D. DeNardo
中科院分区：
文献类型：
--
作者：
O. Lourdais;Sophie Lorioux;D. DeNardo
雌性通常通过在开始繁殖之前以脂肪的形式积累和储存能量来管理与繁殖相关的高能量需求。然而，脂肪储存不能满足所有的生殖资源需求，其中包括相当大的氨基酸投资（例如，用于蛋黄蛋白的生产或糖异生）。因为资本育种者通常在繁殖过程中不吃东西，这些氨基酸必须来自内部资源，通常是肌肉蛋白质。虽然繁殖的能量成本已经得到了很好的研究，但关于肌肉降解以满足氨基酸需求的结构和性能成本的数据有限。因此，我们研究了纯资本繁殖者儿童蟒蛇（Antaresia childreni）在繁殖过程中的结构变化（外轴肌宽度）和性能成本（收缩和力量）。我们发现产卵（即直接资源分配）和母性护理（卵孵化）都会诱导肌肉分解代谢并影响雌性的生产性能。虽然非生殖雌性的轴外肌损失最小，但它高达初始肌宽度的22%（产卵后）和34%（孵卵后）。有趣的是，我们发现初始肌肉条件较高的个体将更多的肌肉分配给生殖。肌肉损失的数量与产蛋质量显著相关，强调了结构蛋白在产蛋中的作用。卵育显著增加蛋白水解和外轴损失，尽管没有直接分配给后代。肌肉损失与生育后女性表现的显著下降有关。总体而言，这些结果表明，资本繁殖雌性经历了巨大的成本，消耗了结构性资源并危及了绩效。
Females often manage the high energy demands associated with reproduction by accumulating and storing energy in the form of fat before initiating their reproductive effort. However, fat stores cannot satisfy all reproductive resource demands, which include considerable investment of amino acids (e.g., for the production of yolk proteins or gluconeogenesis). Because capital breeders generally do not eat during reproduction, these amino acids must come from internal resources, typically muscle proteins. Although the energetic costs of reproduction have been fairly well studied, there are limited data on structural and performance costs associated with the muscle degradation required to meet amino acid demands. Thus, we examined structural changes (epaxial muscle width) and performance costs (constriction and strength) over the course of reproduction in a pure capital breeder, the children’s python (Antaresia childreni). We found that both egg production (i.e., direct resource allocation) and maternal care (egg brooding) induce muscle catabolism and affect performance of the female. Although epaxial muscle loss was minimal in nonreproductive females, it reached up to 22% (in females after oviposition) and 34% (in females after brooding) of initial muscle width. Interestingly, we found that individuals with higher initial muscular condition allocated more of their muscle into reproduction. The amount of muscle loss was significantly linked to clutch mass, underscoring the role of structural protein in egg production. Egg brooding significantly increased proteolysis and epaxial loss despite no direct allocation to the offspring. Muscle loss was linked to a significant reduction in performance in postreproductive females. Overall, these results demonstrate that capital-breeding females experience dramatic costs that consume structural resources and jeopardize performance.
短暂和长期饥饿期间大鼠骨骼肌肌原纤维蛋白降解的调节。
DOI：
10.1016/0026-0495(86)90025-9
发表时间：
1986
期刊：
Metabolism: clinical and experimental
影响因子：
--
作者：
Lowell,BB;Ruderman,NB;Goodman,MN
通讯作者：
Goodman,MN
父母照顾的演变
DOI：
10.1093/acprof:oso/9780199692576.003.0016
发表时间：
2012
期刊：
--
影响因子：
--
作者：
Kölliker M
通讯作者：
Kölliker M