The introduction of exotic species often results in a loss of biodiversity. Mexico has 4 invasive species of freshwater cyclopoid copepods: Thermocyclops crassus, Mesocyclops aspericornis, M. thermocyclopoides, and M. pehpeiensis. The Asian cyclopoid M. pehpeiensis is now established in several lakes and rivers in Mexico, but how it might compete with native species and potentially change the structure of plankton communities is unknown. Some insights might be obtained from a study of its demography compared to that of a native species. We compared the life cycle parameters of the native Mesocyclops longisetus and the exotic invasive species M. pehpeiensis in separate cultures. Four treatments were set up with 2 densities of Plationus patulus (Rotifera) individuals (1 and 4 mL⁻¹) and 2 concentrations of Scendesmus acutus (Chlorophyte) cells (0.5 × 10⁶ and 1.5 × 10⁶ mL⁻¹). Both species survived and reproduced in the treatment of 4 mL⁻¹ of P. patulus individuals + 0.5 × 10⁶ mL⁻¹ of S. acutus cells. Mesocyclops pehpeiensis had common characteristics in successful invasive species: short generation time, high reproductive capacity, and a wide dietary range. At low rotifer densities, M. pehpeiensis had a higher population growth rate (0.12 d⁻¹) compared to M. longisetus (0.08–0.10 d⁻¹). M. pehpeiensis is likely to outcompete M. longisetus, especially under food-limited conditions, and most likely expand its range in Mexico.

外来物种的引进常常导致生物多样性的丧失。墨西哥有淡水cyclopoid桡足类的4个入侵物种：Thermocyclops克拉苏，中剑aspericornis，M. thermocyclopoides，和M. pehpeiensis。亚洲独眼巨人pehpeiensis现在在墨西哥的几个湖泊和河流中建立，但是如何与本地物种竞争并可能改变浮游生物群落的结构尚不清楚。通过与当地物种进行人口统计学研究，可能会获得一些见解。我们比较了当地的Mesocyclops longisetus和外来入侵物种M. pehpeiensis的生命周期参数在不同的文化中。设置了4种处理方法，分别以2个密度的小lation（Rotifera）个体（1和4 mL ^-1）和2个浓度的尖吻菌（Chendophus）（Chlorophyte）细胞（0.5×10 ⁶和1.5×10 ⁶ mL ^-1）进行处理。两种物种在处理4 mL ^-1的pat蛾个体+ 0.5×10 ⁶ mL ^-1的金黄色葡萄球菌后均存活并繁殖。在成功的入侵物种中，Pehpeiensis Mesocyclops pehpeiensis具有共同的特征：繁殖时间短，繁殖力高和饮食范围广。在低轮虫密度下pehpeiensis种群的增长速度（0.12 d ^-1）比longisetus种群（0.08–0.10 d ^-1）高。pehpeiensis可能会胜过M. longisetus，特别是在食物限制的情况下，最有可能扩大其在墨西哥的分布范围。