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Adaptive Osmotic Responses of Macrobrachium Acanthurus (Wiegmann) and Macrobrachium Carcinus (Linnaeus) (Decapoda, Palaemonidae) From the Southern Gulf of Mexico

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The osmotic response of adult prawns, Macrobrachium acanthurus and Macrobrachium carcinus from the coast of the southern Gulf of Mexico was studied in an adaptive sense. Four experimental treatments were employed to test the effects of gradual and abrupt changes in salinity. M. acanthurus is a hyperosmotic regulator in salinities between 0 and 20 psu, reaching its isosmotic point at 632 mOsm kg-1. Beyond this point, the species is hyposmotic. M. carcinus is a hyperosmotic regulator in salinities from 0 to 15 psu, with an isosmotic point at 490 mOsm kg -1 and showing a tendency to hypoconforming in high salinities. The maximum salinities tolerated were 25 psu for M. acanthurus and 30 psu for M. carcinus.

Se hizo una comparación de la respuesta osmorreguladora entre langostinos adultos de Macrobrachium acanthurus y Macrobrachium carcinus provenientes del sudeste del Golfo de México. Los organismos se sometieron a cuatro diferentes tratamientos experimentales con cambios bruscos y graduales de salinidad. M. acanthurus presenta un comportamiento hiperosmótico en salinidades de 0 a 20 ups alcanzando su punto isosmótico en 632 mOsm kg-1 después de este punto la especie esultó hiposmótica.M. carcinus presenta un comportamiento hiperosmótico en salinidades de 0 a 15 ups, con un punto isosmótico de 490 mOsmkg -1, con una tendencia a ser hipoconforme en altas salinidades. Las máximas salinidades toleradas por los organismos fueron de 25 ups para M. acanthurus de 30 ups para M. carcinus.

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