Quantitative genetics and fitness effects of basal metabolism
Quantitative genetics and fitness effects of basal metabolism
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DOI：
10.1007/s10682-012-9590-2
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发表时间：
2013-03-01
影响因子：
1.9
通讯作者：
Schroderus, Eero
中科院分区：
文献类型：
--
作者：
Boratynski, Zbyszek;Koskela, Esa;Schroderus, Eero
生殖的生理要求被预测为在能量、生理和生活史特征之间产生联系。同时，通过能量消耗测量的低维护成本预计是有利的。在这里，我们调查健身性状的相关性估计之间的遗传相关性，近交衰退，体重，基础代谢率（BMR）和其他生活史特征的野生啮齿动物，Myodes glareolus。绝对和质量校正BMR的狭义遗传力女性较高（h（2）= 0.48和0.42），但男性较低且不显著（0.32和0.09）。一个显着的正遗传相关性BMR和产仔数表明，性状连接到女性生殖力可能有利于更高的代谢（即支持增加摄入量假说）。然而，近亲繁殖衰退的估计表明，虽然较高的体重和雌性产仔数的值可能与整体适合度呈正相关，BMR和整体适合度之间的关联在银行田鼠（即支持补偿假说）。这一结果表明，较大的窝和较大的身体质量的优势可能是进化的限制，这些特征的维护成本高，反映了基础代谢水平。
The physiological requirements of reproduction are predicted to generate a link between energy, physiology and life history traits. Simultaneously, low maintenance costs, measured by energy consumption, are expected to be advantageous. Here we investigated fitness relatedness of traits by estimating genetic correlations between, and inbreeding depression for, body mass, basal metabolic rate (BMR) and other life history characters in a wild rodent, Myodes glareolus. The narrow-sense heritability of absolute and mass corrected BMRs were high for females (h(2) = 0.48 and 0.42) but low and non-significant for males (0.32 and 0.09). A significant positive genetic correlation between BMR and litter size suggests that traits connected to female fecundity might favour higher metabolism (i.e. support increased intake hypothesis). However, the estimates of inbreeding depression indicate that, while higher values of body mass and female litter size could be positively associated with overall fitness, the association between BMR and overall fitness in bank voles would be negative (i.e. support compensation hypothesis). This result suggests that the advantages of larger litters and larger body mass might be evolutionary constrained by high costs of maintenance of those traits, as reflected by the level of basal metabolism.