Laboratorio de Etología, Ecología y Evolución, Instituto de Investigaciones Biológicas Clemente Estable, Avenida Italia 3318, Montevideo 11600, Uruguay.
Zoology (Jena). 2011 Oct;114(5):272-5. doi: 10.1016/j.zool.2011.05.003. Epub 2011 Sep 9.
In sex role reversed species, females and males adopt behaviors that are not the traditional ones for that animal group. Furthermore, this reversal can translate into physiological differences between the sexes in characteristics such as energetic demands or immune response. Allocosa brasiliensis shows a reversal in the sex roles and sexual size dimorphism that would be expected for spiders. Males are larger than females and are sedentary, while females are the mobile sex that looks for males and initiates courtship. Our objective was to explore the occurrence of sexual dimorphism in immune response, fat content and muscular mass in A. brasiliensis, and relate the results to the reproductive strategies of the species. An encapsulation response was used as an estimate of the immune response. Abdominal fat content and leg muscular mass were quantified and the results were compared between females (N = 19) and males (N = 21). Males showed higher values of the three characteristics as compared to females. Life history divergences between the sexes regarding size, mobility and foraging opportunities could be factors driving these differences in immune response and energy requirements.
在性角色反转的物种中，雌性和雄性会表现出不符合该动物群体传统行为的行为。此外，这种反转可以转化为性别之间在能量需求或免疫反应等特征上的生理差异。巴西游走蛛表现出性角色反转和性二型性，这是蜘蛛中预期的现象。雄性比雌性大，并且是静止的，而雌性是寻找雄性并发起求偶的活动的性别。我们的目标是探讨巴西游走蛛在免疫反应、脂肪含量和肌肉质量方面的性二型性，并将结果与该物种的繁殖策略联系起来。包埋反应被用作免疫反应的估计。定量了腹部脂肪含量和腿部肌肉质量，并将结果与雌性（N = 19）和雄性（N = 21）进行了比较。与雌性相比，雄性在这三个特征上的值更高。关于体型、活动性和觅食机会的性别间生活史差异可能是导致免疫反应和能量需求差异的因素。
