摘要 : Since 1935, the freshwater discharge from the Colorado River into the Gulf of California has decreased drastically, affecting the biological cycles of endemic species and other endangered species. In this study, a relationship was... 展开 Since 1935, the freshwater discharge from the Colorado River into the Gulf of California has decreased drastically, affecting the biological cycles of endemic species and other endangered species. In this study, a relationship was determined between the Colorado River freshwater discharge, the abundance of blue shrimp, Litopenaeus stylirostris (Stimpson, 1874) postlarvae, and the density of adult shrimp in the Upper Gulf of California (UGC). Data on Colorado River flow from 1904 to 2002, blue shrimp postlarvae from 1993 to 1997, and records of daily catches from pangas (small boats) of the commercial fleet operating in UGC from 1995 to 2002, were analysed. Catch per unit effort (CPUE) was used as a measure of the average daily density of adult shrimp. Two groups of CPUE and postlarvae abundance were found, with significant differences between them. The highest population density was observed in the years when the river flow was greater than 80 m3s-. The lowest density was found for periods when the river flow was lower than 80 m3s-. We conclude that the response of the shrimp population is non-linear and that postlarvae abundance and commercial fleet CPUE increased during the years in which freshwater discharge was highest, possibly because the habitat volume increased, consequently resulting in increased food availability for the shrimp. SpanishA partir del ano de 1935, las descargas de agua dulce del Rio Colorado al Golfo de California han disminuido drasticamente, afectando el ciclo biologico de especies endemicas y otras en peligro de extincion. En este estudio, se determino una relacion entre la descarga de agua dulce del Rio Colorado, la abundancia de postlarva de camaron azul Litopenaeus stylirostris (Stimpson, 1874) y la densidad de adultos de camaron en el Alto Golfo de California (AGC). Se utilizo informacion del flujo del Rio Colorado de 1904 a 2002, de postlarva de camaron azul de 1993-1997 y los registros de captura diaria de las pangas de la flota comercial que opero en el AGC de 1995 a 2002. Como medida de densidad promedio diario de los adultos se utilizo la captura por unidad de esfuerzo (CPUE). Se encontraron dos grupos de abundancia de postlarva y CPUE, con diferencias significativas entre ellos. El valor superior se presenta en los anos cuando el flujo del rio fue mayor que 80 m3s-1. El grupo del valor inferior se presento cuando el flujo del rio estaba a menos de 80 m3s-1. Se concluyo que la respuesta de la poblacion de camaron no es lineal y que la abundancia de postlarva y la CPUE de la flota comercial aumentaron en anos cuando la descarga de agua dulce era mayor, posiblemente porque se expandio el volumen del habitat y con esto hubo una mayor disponibilidad de alimento. Articles that cite this article? 收起