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汪洋, 曾治高, 马亮, 李树然, 杜卫国. 2017: 食物限制对密点麻蜥繁殖投入和幼体表型的影响. 动物学研究, 38(2): 81-87. DOI: 10.24272/j.issn.2095-8137.2017.011
引用本文: 汪洋, 曾治高, 马亮, 李树然, 杜卫国. 2017: 食物限制对密点麻蜥繁殖投入和幼体表型的影响. 动物学研究, 38(2): 81-87. DOI: 10.24272/j.issn.2095-8137.2017.011
Yang Wang, Zhi-Gao Zeng, Liang Ma, Shu-Ran Li, Wei-Guo Du. 2017: Food restriction affects maternal investment but not neonate phenotypes in a viviparous lizard. Zoological Research, 38(2): 81-87. DOI: 10.24272/j.issn.2095-8137.2017.011
Citation: Yang Wang, Zhi-Gao Zeng, Liang Ma, Shu-Ran Li, Wei-Guo Du. 2017: Food restriction affects maternal investment but not neonate phenotypes in a viviparous lizard. Zoological Research, 38(2): 81-87. DOI: 10.24272/j.issn.2095-8137.2017.011

食物限制对密点麻蜥繁殖投入和幼体表型的影响

Food restriction affects maternal investment but not neonate phenotypes in a viviparous lizard

  • 摘要: 食物可得性作用于动物的能量代谢,进而显著影响其表型特征、生存和繁殖。因此,母体和后代对食物变化的响应对于了解一个物种的种群动态和生活史进化至关重要。本研究在中国内蒙古荒漠草原野外围栏条件下,探讨食物限制对胎生密点麻蜥的繁殖、产后身体状态以及后代表型的影响。发现低食物条件下母体的身体状况和免疫功能较高食物母体差。食物可得性显著影响窝仔数和窝仔重,但并不影响怀仔期、繁殖成功率、幼体体重、疾跑速度和性别比例。低食物母体的窝仔数较小、窝仔重较轻。这些结果表明,面对食物限制的密点麻蜥会减少后代数量,但维持后代大小和运动功能表现不变。该繁殖对策的代价是母体产后的身体状态和免疫能力显著下降。母体对食物可得性变化的灵活响应是重要的生活史对策,有助于蜥蜴应对不可预测的环境变化。

     

    Abstract: Food availability significantly affects an animal's energy metabolism, and thus its phenotype, survival, and reproduction. Maternal and offspring responses to food conditions are critical for understanding population dynamics and life-history evolution of a species. In this study, we conducted food manipulation experiments in field enclosures to identify the effect of food restriction on female reproductive traits and postpartum body condition, as well as on hatchling phenotypes, in a lacertid viviparous lizard from the Inner Mongolian desert steppe of China. Females under low-food availability treatment (LFT) had poorer immune function and body condition compared with those under high-food availability treatment (HFT). The food availability treatments significantly affected the litter size and litter mass of the females, but not their gestation period in captivity or brood success, or the body size, sprint speed, and sex ratio of the neonates. Females from the LFT group had smaller litter sizes and, therefore, lower litter mass than those from the HFT group. These results suggest that female racerunners facing food restriction lay fewer offspring with unchanged body size and locomotor performance, and incur a cost in the form of poor postpartum body condition and immune function. The flexibility of maternal responses to variable food availability represents an important life strategy that could enhance the resistance of lizards to unpredictable environmental change.

     

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