啮齿动物胎仔数与生活史变量的关系

胎仔数是影响哺乳动物繁殖率的基本参数 ,与动物的生活史变量密切相关。胎仔数及其相关的生活史变量 ,包括后代的质量、幼体的生存、母体的体重及母体的生存等 ,共同影响繁殖适合度。简述了胎仔数与生活史变量关系的研究方法及研究对象的选择 ,着重介绍了胎仔数与幼体和母体生活史变量的关系 :胎仔数与后代的质量呈负相关 ,后代的质量又决定了幼体的生存 ;胎仔数与母体体重相关不显著 ,而且可能对母体的生存产生负面影响。有关胎仔数与其生活史变量的关系还有待于进一步的探索 ,更多先进技术手段与方法的交叉运用将补充和完善胎仔数研究的内容

Litter Size and Related Life History Characteristics in Rodents

Litter size is a key parameter in understanding mammalian reproductive patterns. The amount of surviving litter size, the offspring size and the state of their mothers determine the reproductive fitness together. There are tradeoffs between the litter size and offspring size. While the offspring survival depends on the offspring size. However, the relationship between the litter size and offspring survival can still not draw a constant conclusion. The maternal fitness also is symbolized by the survival of young, so the litter size directly correlate with the maternal variables including the body mass and metabolic rate. There is the negative effect on the maternal survival, but the relationship between the litter size and maternal survival is unclear. In short, the study of litter size needs further explore, while fortunately recent advances in molecular techniques and the other means provide options for those as well.