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Population structure and reproductive traits of a population of Hyalella curvispina from Uruguay. The aim of this study is to characterize the population dynamics and the reproductive strategies of a population of Hyalella curvispina. The study was conducted in a temporary pond in Montevideo. The specimens were collected monthly from July 2019 to June 2020, the individual of H. curvispina were found from July to November 2019, before the pond dries. A total of 1268 specimens were collected: 395 males, 687 females, 78 ovigerous females and 108 juveniles. The presence of ovigerous females and pre-copula was higher during winter. A positive correlation was observed between the absolute abundance and the conductivity. Total sex ratio favored females. The length of the cephalothorax (LC) was greater in males than in females. The frequency distribution in size classes was normal except in November. A positive correlation was observed between the number of eggs in stages I and II and the length of the cephalothorax. These results showed that this population of H. curvispina has similar dynamics to other three species of Hyalella from Rio Grande do Sul, Brasil, although differences in size and fertility were observed in the organism here studied.

ESTRUCTURA POBLACIONAL Y ASPECTOS REPRODUCTIVOS DE UNA POBLACIÓN DE Hyalella curvispina (Shoemaker, 1942) DE URUGUAY