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Volume 45 - Number 3 - 2010
Nota Científica

 


Estimation of the thermal ranges associated with the distribution of Sardinops sagax caeruleus, based on its thermal preference

Marcel Martínez-Porchas1 y Mónica Hernández-Rodriguez2,3


1Centro de Investigación en Alimentación y Desarrollo (CIAD) A.C., Km 0,6 Carretera a La Victoria ZC 83304, Hermosillo, Sonora, México

2Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Km. 107, Carretera Tijuana-Ensenada, Baja California, México

3Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Departamento de Acuicultura, P.O. Box: 434844, San Diego, CA. 92143-4844, Estados Unidos

 

E-mail: mhernand@cicese.mx

 

The Pacific sardine (Sardinops sagax caeruleus) from Ensenada, Mexico, was exposed to two thermal regimes, cold (CR:13-18°C) and warm (WR:18-23°C) for 20 days. The thermal preference was studied using a gradient of temperatures, recording the preferred and avoided sites by the sardine. No significant differences among acclimation thermal regimes were observed for thermal preference. However, there was some difference for avoided temperatures showed by these two groups of sardine; 13.3-19.3°C was for CR and 16.9-22.3°C for WR. These results suggest that the studied sardine are able to survive within a thermal environment from 13.3 to 22.3°C, which shifts in the area delimited by San Francisco and Magdalena Bay

 

Key words: Pacific sardine, distribution, thermal behavior, migration

 

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