Resumen

MARTINEZ-LOPEZ, Aída; CERVANTES-DUARTE, Rafael; REYES-SALINAS, Amada  y  VALDEZ-HOLGUIN, José Eduardo. Cambio estacional de clorofila a en la Bahía de La Paz, B. C. S., México. Hidrobiológica [online]. 2001, vol.11, n.1, pp.45-52. ISSN 0188-8897.

From April 1993 to March 1995 hourly wind data, intensity and direction, were analyzed. Monthly sampling of temperature, Secchi disc depth and chlorophyll a were carried out on 5 stations transect across the Bahía de La Paz at surface, 10 and 25 meters depth. Southward winds were dominant during October to March and northward the rest of the year. The highest temperatures were registered from July to October with temperatures between 28 and 32 °C, and the lowest from January to March, with values in the range of 20 and 22 °C. Maximum Secchi depths (14-24 m) was observed during July through November and minimum during January to June (6-15 m). Chlorophyll a concentration showed an inverse relationship with temperature and water transparency. The lowest integrated chlorophyll a values (<10 mg m^-2) were found at warm season as a result probably of a strong water column stratification and slow vertical transport of dissolved and particulate materials from deep layers. Maximum values (142.8 mg m^-2) during cold season were associated with water column mixing processes and nutrient availability in the euphotic zone.

Palabras llave : Chlorophyll a; phytoplankton; transparency; seasonal change; Bahía de La Paz; Mexico.

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