敏麻蜥卵形状的异速增长与卵大小和数量的权衡  

Egg shape allometry and egg size-number trade-off in the steppe racerunner( Eremias arguta)

作　　者：梁涛[1] 时磊[1] LIANG Tao;SHI Lei(College of Animal Science,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学动物科学学院,乌鲁木齐830052

出　　处：《生态学杂志》2018年第9期2761-2767,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31660613)资助

摘　　要：卵大小与数目的权衡是繁殖生态学研究的重点之一,生理限制假说预测雌性自身能量储存决定了对单个卵能量的分配,形态限制假说认为雌性形态亦会限制卵大小或(和)数目。本研究对敏麻蜥雌性形态和繁殖相关指标进行分析,以验证上述假说。结果表明:敏麻蜥的卵短径随着雌性尾基宽的增加而增大,卵长径、卵体积和窝卵数随着雌性腋跨距的增大而增大;此外,卵重和窝卵数随着雌性身体状况指数的增加而增加;卵大小与数目之间呈显著正相关而不存在权衡,表明雌性通过同时增加卵大小与数目来增加繁殖投入;敏麻蜥的卵形状与雌体局部形态均存在异速增长现象,且卵形状异速增长斜率小于雌性局部形态异速增长的斜率;在去除窝卵数的影响后,两者的异速增长斜率却无显著差异。研究表明,敏麻蜥雌性的形态可以限制卵大小与数量;具有较好身体状况的雌性可以产更重且更多的卵;卵重与数目之间没有权衡;雌性形态限制是导致卵形状异速增长的潜在因素。The trade-off between egg size and number is a key trait of life history. The physiological constraint hypothesis predicts that the energy storage of a female affects the energy allocation to individual egg. Nonetheless,the morphological constraint hypothesis proposes that female body size is linked to egg number and size. Here,we analyzed the morphological traits and reproduction-related parameters of the female Eremias arguta,to test the above hypotheses. Our results showed that egg width increased with the increases of female tail base width. Egg length,egg volume,and clutch size increased with the increases of axilla-groin length. Both egg mass and number increased with increasing body condition index. A significantly positive relationship but no trade-off was found between egg size and number,indicating that females improve their reproductive outputs by increasing both egg size and number. An allometry existed between egg shape and female morphological trait,and the allometric slope of female morphological trait was steeper than that of egg shape. After the effect of clutch size being eliminated by calculating residual scores from the separate regressions of egg length and egg width on clutch size,there was no difference in the allometric slope between egg shape and female morphological trait. We found evidence that morphology of female E. arguta constrains egg size and number and females with a better body condition producing larger and more eggs. There is no trade-off between egg size and clutch size,and allometry in egg shape might be due to morphological constraints.

关 键 词：卵大小 窝卵数 生理限制假说 形态限制假说 异速增长 

分 类 号：Q958[生物学—动物学]