The stream frog Plectrohyla acanthodes presents a strong decrease in its populations, this could be associated with extreme fluctuations in the precipitation cycles that go from periods of extreme rains followed by periods of desiccation that modify and affect the survival of their first stages of life. The objective of this study was to identify the effects of extreme precipitation on the larval development of a population of P. acanthodes along a temporary stream, in San Cristóbal de las Casas, Chiapas. 10 sampling points were established to evaluate the physical conditions, as well as the morphometric measurements of the 57 tadpoles found. The excess of rainfall influenced the temperature, depth, the number of tadpoles found and the existing background material, generating differences between the sampling points. Most of the tadpoles were found in less elevated points with less depth, temperatures above 17 ° C and sandy bottom material where most of it was concentrated. It was also possible to distinguish differences in the size of the tadpoles, the largest were found at the lowest altitude points. However, these points are closer to human populations, domestic animals that defecate in the stream and where there is a greater accumulation of solid waste, which puts the successful development of tadpoles at risk, which could be associated with the absence of adult organisms during the study. It is necessary to monitor this population and its development, evaluate the level of contamination and its repercussions and know if the increase in the flow of water due to rainfall intervenes in its dispersion.
