HR: 1400h
AN: GS23A-02    [Abstracts]
TI: Spatial and temporal variation of water quality in the coastal lagoons of Sinaloa
AU: * Paez-Osuna, F
EM: paezos@ola.icmyl.unam.mx
AF: Universidad Nacional Autónoma de México. Institute of Marine Sciences and Limnology. Mazatlan Academic Unit., Calz. J. Montes Camarena s/n, col. Playa Sur, Mazatlan, Sin 82040, Mexico
AU: Lopez-Aguiar, L K
EM: paezos@ola.icmyl.unam.mx
AF: Universidad Nacional Autónoma de México. Posgraduate Program of Marine Sciences and Limnology. Mazatlan Academic Unit., Calz. J. Montes Camarena s/n, col. Playa Sur, Mazatlan, Sin 82040, Mexico
AU: del Río-Chuljak, A
EM: paezos@ola.icmyl.unam.mx
AF: Universidad Nacional Autónoma de México. Posgraduate Program of Marine Sciences and Limnology. Mazatlan Academic Unit., Calz. J. Montes Camarena s/n, col. Playa Sur, Mazatlan, Sin 82040, Mexico
AU: Ruiz-Fernandez, A C
EM: caro@ola.icmyl.unam.mx
AF: Universidad Nacional Autónoma de México. Institute of Marine Sciences and Limnology. Mazatlan Academic Unit., Calz. J. Montes Camarena s/n, col. Playa Sur, Mazatlan, Sin 82040, Mexico
AB: The Mexican state of Sinaloa has 656 km of coastline and 221,600 ha of coastal lagoons, and is characterized by a high fishing and agriculture activity. It is well known that agricultural activities constitute a major factor affecting the water quality in the coastal waters. The current study focused on the 6 more important coastal lagoons of Sinaloa (Topolobampo-Ohuira-Santa María, Navachiste-San Ignacio-Macapule, Santa María-La Reforma, Altata-Ensenada del Pabellón, Ceuta and Teacapán-Agua Brava) with the aim to evaluate the water quality spatial and temporal variation at the lagoons (physico-chemical parameters, nutrients (N, P and Si), dissolved oxygen, total suspended solids and chlorophyll a) and to assess its eutrophication status. The water samples were collected in several stations at each lagoon (between 9 and 23 stations depending on the lagoon area) at low and high tides, during three different weather periods (dry-warm, rainy and dry-cold seasons) between May 2004 and April 2005. Mean concentrations of nutrients (μM), dissolved oxygen (mg/L) and chlorophyll a (mg/m³) obtained for each variable were comparable between lagoons (total N=51±45; total P= 2.5±1.5; Si=23±31; DO=6.7±1.8; Chll=1.7±1.9) although seasonal and spatial differences were observed at each lagoon. The nutrient concentrations measured fell in the typical concentration intervals for coastal lagoons; however, critical sampling points were identified and related to direct discharges of untreated effluents from municipal wastes, aquaculture farms and agriculture drain ditches.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0496 Water quality
SC: Geochemical Society [GS]
MN: 2007 Joint Assembly