Dziminski M A, Roberts J D
School of Animal Biology, University of Western Australia, Australia.
J Evol Biol. 2006 Jan;19(1):144-55. doi: 10.1111/j.1420-9101.2005.00978.x.
Variable maternal provisioning may evolve when there is variation in the quality of offspring environments. The frog Crinia georgiana has high variability in egg size both within and between clutches, independent of female phenotype. It breeds in ponds with high spatial and temporal variation in habitat quality. Egg size strongly affected offspring fitness in good and poor quality offspring environments, whether the egg size difference was from between or within clutches. Since there is a trade-off in egg size and number, these fitness consequences translate to strong effects on maternal fitness. In the variable and unpredictable offspring environment of C. georgiana, the maintenance of variable maternal provisioning both within and between clutches is likely to be an evolved response to the offspring environment.
当后代环境质量存在差异时，可变的母体资源分配可能会进化。青蛙格鲁吉亚姬蛙（Crinia georgiana）的卵大小在窝内和窝间都有很大的变异性，与雌性表型无关。它在栖息地质量具有高度时空变化的池塘中繁殖。无论卵大小差异是来自窝间还是窝内，卵大小在优质和劣质后代环境中都对后代适合度有强烈影响。由于卵大小和数量之间存在权衡，这些适合度后果会转化为对母体适合度的强烈影响。在格鲁吉亚姬蛙可变且不可预测的后代环境中，窝内和窝间可变的母体资源分配的维持可能是对后代环境的一种进化反应。
