Avaca María Soledad, Storero Lorena, Martín Pablo, Narvarte Maite
Biol Bull. 2021 Apr;240(2):95-104. doi: 10.1086/713065. Epub 2021 Mar 30.
AbstractIn most animal taxa, large mothers (or those with high nutritional status) produce large offspring, leading to a maternal size-offspring size correlation, that is, a positive correlation between maternal size and offspring size. Here, we used the natural variation in maternal size between three natural populations of (a marine snail with direct development, nurse egg feeding, and a single embryo per egg capsule) to study maternal investment and offspring size. The main objectives were to compare offspring size and maternal investment traits within and between populations and to evaluate the relationship between maternal size and offspring size. Although not supported in every population, our results show that maternal size was positively correlated with offspring size, thus representing an example of the maternal size-offspring size correlation in a species in which there is no competition for food between capsule mates because only one embryo develops per capsule. These findings also suggest that in larger mothers produce more offspring and provide their offspring with more resources, and that this between-population variation in offspring size is related to differences in the number of nurse eggs allocated per egg capsule and in egg capsule size. The ubiquity of the maternal size-offspring size correlation in needs to be tested further across populations, because factors other than maternal size could influence offspring size variation in this marine gastropod.
摘要
在大多数动物类群中，体型较大的母体（或营养状况良好的母体）会产出体型较大的后代，从而形成母体大小与后代大小的相关性，即母体大小与后代大小之间呈正相关。在此，我们利用（一种直接发育、以育卵为食且每个卵囊仅有一个胚胎的海蜗牛）三个自然种群之间母体大小的自然差异，来研究母体投资和后代大小。主要目标是比较种群内部和种群之间的后代大小及母体投资特征，并评估母体大小与后代大小之间的关系。尽管并非在每个种群中都得到支持，但我们的结果表明母体大小与后代大小呈正相关，因此这代表了在一个卵囊内由于每个卵囊仅发育一个胚胎而不存在同胞竞争食物的物种中母体大小与后代大小相关性的一个例子。这些发现还表明，在中，体型较大的母体产出更多后代并为其后代提供更多资源，并且后代大小的这种种群间差异与每个卵囊分配的育卵数量及卵囊大小的差异有关。由于除母体大小之外的其他因素可能会影响这种海洋腹足类动物的后代大小变异，因此需要在更多种群中进一步检验母体大小与后代大小相关性在中的普遍性。
