Photoperiodic effects on reproductive development in male cavies (Cavia aperea)
Photoperiodic effects on reproductive development in male cavies (Cavia aperea)
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DOI：
10.1016/j.physbeh.2013.10.017
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发表时间：
2014-01-17
影响因子：
2.9
通讯作者：
Trillmich, F.
中科院分区：
文献类型：
--
作者：
Guenther, A.;Palme, R.;Trillmich, F.
成熟年龄是一个特别重要的生活史参数，因为它预测了许多小型哺乳动物物种的潜在寿命繁殖成功。因此，动物应该通过对预测未来环境条件的环境刺激做出反应，来优化成熟的时机。光周期通常能可靠地预测生态条件。出生在有利条件(春季、夏季)的光周期中的动物可能比出生在不利条件(秋季、冬季)中的动物成熟得更早、体重更低。到目前为止，大多数工作都是在小而灵异的啮齿动物物种上完成的，我们仍然缺乏对它们的早熟亲属的了解。早熟动物出生时比早熟动物发育得更晚，在个体发育轨迹上可能表现出比后者更差的可塑性。我们测试了气候室内增加(春季)或减少(秋季)光照模拟的光周期对高度早熟啮齿动物(Cavia Aperea)重要生活史参数的影响。我们想要确定光周期是否影响雄性鱼子馆成熟和早期生长的时间，以及血液中睾酮的模式是否反映在粪便中睾酮代谢物的模式。出生在模拟春季的雄性比出生在模拟秋季的雄性生长更快，成熟更早。血液中的睾酮类型与粪便中的睾酮代谢物相关。雄性洞穴通过调整生长和成熟的时间来对可预测的光周期信号做出强烈反应，正如我们之前对雌性洞穴所发现的那样，证实了季节性信号对生活史调整的重要性。(C)2013 Elsevier Inc.保留所有权利。
Age at maturity is a particularly important life history parameter, as it predicts potential life time reproductive success in many small mammal species. Animals should therefore optimize the timing of maturation by reacting to environmental stimuli that predict future environmental conditions. Photoperiod often reliably predicts ecological conditions. Animals born into a photoperiod indicating favorable conditions (spring, summer) may mature earlier and at a lower weight than animals born into conditions indicating unfavorable conditions (autumn, winter). So far most work was done on small, altricial rodent species and we still lack knowledge about their precocial relatives. Precocial animals are born much further developed than altricials and might show less plasticity in their ontogenetic trajectory than the latter.We tested the influence of photoperiod simulated by increasing (spring) or decreasing (autumn) light in climate chambers on important life history parameters in a medium sized rodent, the highly precocial cavy (Cavia aperea). We wanted to determine whether photoperiod influences timing of maturation and early growth in male cavies and whether patterns of testosterone in blood are reflected by patterns of testosterone metabolites in feces.Males born into simulated spring grew faster and matured at an earlier age than males born into simulated autumn conditions. Patterns of testosterone in blood correlated with testosterone metabolites measured in feces. Male cavies strongly react to predictive photoperiod cues by adjusting growth and timing of maturation as we found previously for females, corroborating the importance of seasonal cues for adjustments of life history. (C) 2013 Elsevier Inc. All rights reserved.