J. Eduardo Yaldez-Holguín y Luis R. Martínez-Cordova
Centro de Investigaciones Científicas y Tecnológicas de la Universidad de Sonora. Rosales y Niños Héroes. Hermosillo,
Sonora, México.
(Rec. 8-1-1992. Acep. 27-X-1992)

Abstrad: time series analysis was used to determine the main factors influencing variability of sorne enviromental pararneters in two fixed points at the La Cruz Lagoon, Bahia Kino, Sonora, Mexico. Height oC water colurnn and distance to the mouth were the main factors determining differences between the two sarnpling sites. The study showed thal spring and neap tides. and seasonal and annual cycles had a major influence on the variability of the parameters rneasured.

Key words: Coastal lagoon, environmental parameters, prirnary productivity. Mexico.