Abstract
ABSTRACT Pachygrapsus transversus is an abundant crab in the intertidal ecosystems in the tropical and temperate coasts of the Atlantic Ocean. This study aims to investigate the egg production (number and volume) in P. transversus in a temperate region (Torres, Rio Grande do Sul, Brazil), comparing between three stages of egg development and four seasons. Ovigerous females were sampled in 2019 at Praia Prainha once per season. In the laboratory, females were identified, measured, and their eggs were classified by stage of development, counted and measured. The main results were: ovigerous females were collected in all seasons, but showed a sharp decrease in winter; fecundity (stage I) was positively correlated with female body size and the highest number of eggs was found in spring and summer; the egg volume was higher in autumn than all other seasons; there was an increase in egg volume during development, while egg loss was only detected in spring. The reproduction of P. transversus presented seasonal and latitudinal differences, which are attributed to environmental conditions.
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