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espanolEl camaron Macrobrachium amazonicum ha sido considerado una especie colonizadora exitosa de ambientes de agua dulce mas alla de su area de distribucion nativa; sin embargo, la informacion sobre la distribucion de la especie en los rios del noreste de Brasil es dudosa o incompleta. Este estudio actualiza la presencia del langostino del rio Amazonas Macrobrachium amazonicum en el rio Sao Francisco (noreste de Brasil) donde se muestrearon ocho areas aguas abajo de la Central Hidroelectrica Xingo (Alagoas / Sergipe) hasta la desembocadura del rio, entre abril de 2014 y febrero. 2016. Los especimenes fueron muestreados utilizando redes de arrastre manuales y trampas artesanales. Los datos hidrologicos se obtuvieron utilizando una sonda multiparametrica. Solo se encontraron 258 ejemplares en Piranas, Pao de Acucar y Belo Monte, que son regiones alejadas de la desembocadura del rio. Se encontraron en aguas someras (3.96 ± 1.01 m), calidas (26.15 ± 1.18 ° C) y frescas oxigenadas (5.70 ± 1.14 mg L-1) con baja turbidez (71.33 ± 6.43 mg L-1) y leve alcalinidad ( 7,26 ± 0,53), siempre asociado a la vegetacion acuatica. La presencia de M. amazonicum aun no ha sido evaluada en relacion a posibles impactos sobre la diversidad nativa local. Por lo tanto, es necesario realizar estudios que aborden la interaccion de esta especie con especies nativas para comprender si representa o no un riesgo para las especies endemicas EnglishThe prawn Macrobrachium amazonicum has been considered a successful colonizing species of freshwater environments beyond its native range; however, information on the distribution of the species in rivers in northeastern Brazil is doubtful or incomplete. This study updates the presence of the Amazon River prawn Macrobrachium amazonicum in the Sao Francisco River (northeast Brazil) where eight areas were sampled downstream from the Xingo Hydroelectric Plant (Alagoas/Sergipe) up to the mouth of the river, between April 2014 and February 2016. The specimens were sampled using manual trawls and artisanal traps. Hydrological data were obtained using a multi-parameter probe. Only 258 specimens were found in Piranhas, Pao de Acucar, and Belo Monte, which are regions far from the mouth of the river. They were found in shallow (3.96 ± 1.01 m), warm (26.15 ± 1.18 °C), and oxygenated fresh waters (5.70 ± 1.14 mg L-1) with low turbidity (71.33 ± 6.43 mg L-1) and slight alkalinity (7.26 ± 0.53), always associated with the aquatic vegetation. The presence of M. amazonicum has not yet been evaluated in relation to possible impacts on local native diversity. Therefore, studies addressing the interaction of this species with native species are necessary to understand whether or not it poses a risk to endemic species |
