Crustacea Decapoda capturados através de coleta passiva em um trecho do Rio dos Mangues (Porto Seguro – BA)

Abstract

This paper aimed to carry out, through passive collection, a survey of Crustacea Decapoda species present in a stretch of Rio dos Mangues (Porto Seguro – Bahia – Brazil), during spring season of 2009. The collections were carried out in five sites, distributed over the final 10km of the river, using traps containing biological bait left underwater for 15h. To assess the abiotic variables, temperature, pH, and conductivity values were measured. A total of 135 individuals was registered, belonging to three species: the shrimps Macrobrachium acanthurus (Wiegmann, 1836) and M. olfersi (Wiegman, 1836), besides the crab Trichodactylus fluviatilis Latreille, 1828. In addition to these, two other crab species were collected: Goniopsis cruentata (Latreille, 1803) and Panopeus lacustris Desbonne, 1867. The highest values were registered in P4 (34.07% of individuals), P1 (23.70%), and P3 (22.96%). Temperature and pH presented a small variation throughout the analyses (respectively, 5.1-5.8 and 25.7-29.1°C). In turn, conductivity differed the estuary point (P5) from the other ones (respectively, 886mS and 41-48mS). No individual was registered in P2. The distribution of species was related to the type of microhabitat and the habit of each of them.