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首页> 外文期刊>Herpetologica >Growing apart together: The development of contrasting sexual size dimorphisms in sympatric Sceloporus lizards
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Growing apart together: The development of contrasting sexual size dimorphisms in sympatric Sceloporus lizards

机译：共同成长：同胞Scoloporus蜥蜴的相反的性大小二态性的发展

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Comparative biologists often conceptualize sexual size dimorphism (SSD) as a static characteristic of adult populations, but recent work has emphasized that SSD reflects a developmental process in which males and females "grow apart" in body size. This ontogenetic perspective requires knowledge of (1) the demographic factors that give rise to SSD (e.g., differential survival, migration, or growth) and (2) the ontogenetic timing of these sexual differences (e.g., juvenile, maturational, or adult divergence). Together, such data help formulate testable hypotheses concerning proximate physiological mechanisms responsible for the development of SSD. To illustrate this approach, we present a case study of two sympatric lizard congeners with opposite patterns of SSD (Sceloporus virgatus: female-larger; S. jarrovii: male-larger). Using mark-recapture data, we show that (1) sex differences in survival and migration cannot account for SSD, and (2) both nonlinear growth models and age-specific linear growth rates identify sexually dimorphic growth as the cause of SSD in each species. SSD develops in S, virgatus because females grow, more quickly than males, particularly during the spring mating season. By contrast, SSD develops in S. Jarrovii because males grow more quickly than females throughout the first year of life, particularly in association with vitellogenesis and gestation in females. Thus, opposite developmental patterns of SSD in these species may reflect underlying differences in energetic trade-offs between reproduction and growth.
机译：比较生物学家通常将性大小二态性（SSD）概念化为成年人口的静态特征，但是最近的工作强调，SSD反映了男性和女性的体型“增长”的发育过程。这种个体发育的观点要求了解以下方面的知识：（1）导致SSD的人口统计学因素（例如差异性生存，迁移或生长），以及（2）这些性别差异的个体发育时间（例如，青少年，成熟或成人差异） 。在一起，这些数据有助于制定有关可导致SSD发展的生理机制的可检验假设。为了说明这种方法，我们提供了一个案例，研究了两种具有相反模式SSD的同伴蜥蜴同类动物（Sceloporus virgatus：雌性较大; S。jarrovii：雄性较大）。使用标记捕获数据，我们表明（1）生存和迁徙中的性别差异不能解释SSD，并且（2）非线性增长模型和特定年龄的线性增长率都将性双态增长确定为每个物种中SSD的原因。 SSD的生长是在S处，因为雌性比雄性生长更快，特别是在春季交配季节。相比之下，SSD在Jarrovii中得以发展，因为在整个生命的第一年中，男性的生长速度要快于女性，尤其是与女性的卵黄发生和妊娠有关。因此，在这些物种中，SSD的相反发展模式可能反映了繁殖与生长之间在能量权衡方面的根本差异。

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