Information on the population biology of alien species in non-natural areas is essential to understanding their impacts on native species. Here, we investigated the life-history traits, the propagule pressure and the supply potential of Athanas nitescens in a non-native area. Sampling was monthly performed from April 2015 to March 2016 in an inter-tidal estuary in the south-eastern Brazilian coast. The population had a female-biased sex ratio with a predominance of ovigerous females. Sexual dimorphism was evidenced by the mean body size and the positive allometry of chelipeds in males and of the second pleonal pleuron in females, evidencing an energy allocation to weaponry body structures and reproduction, respectively. The estimated size at which 50% of females reach functional sexual maturity was 3.3 mm of carapace length. The mean fecundity, 117 ± 40.03 eggs/female (53–263), had a positive correlation with the carapace length. The egg volume increased (83%) from the initial to the final stage of development. The presence of females carrying eggs in different stages of development indicates that A. nitescens is completing its life cycle in the studied region and shows a high propagule pressure. We provided the first insights into the biology of A. nitescens in Brazilian waters after the first record in 2009 in São Paulo coast, contributing to a better understanding of its biology and ecology in non-natural areas.

中文翻译：

---

首次详细了解西大西洋外星虾 Athanas nitescens (Decapoda: Alpheidae) 的生活史特征

有关非自然区域外来物种种群生物学的信息对于了解它们对本地物种的影响至关重要。在这里，我们调查了Athanas nitescens的生活史特征、繁殖压力和供应潜力在非本土地区。2015 年 4 月至 2016 年 3 月，每月在巴西东南部海岸的潮间带河口进行采样。人口具有女性偏向的性别比例，以雌性雌性为主。雄性螯足和雌性第二胸膜的平均体型和正异速生长证明了性别二态性，分别证明了能量分配给武器身体结构和繁殖。50% 的雌性达到功能性成熟时的估计大小为 3.3 毫米的甲壳长。平均繁殖力为 117 ± 40.03 个卵/雌性 (53–263)，与甲壳长度呈正相关。从发育的初始阶段到最后阶段，卵体积增加 (83%)。一个。 nitescens正在研究区域完成其生命周期，并显示出高繁殖压力。我们提供了对A生物学的初步见解。 在 2009 年在圣保罗海岸首次记录之后，巴西水域的nitescens有助于更好地了解其在非自然区域的生物学和生态学。