Resumen del producto

Anthropogenic activities and climate variability in Terminos Lagoon and adjacent continental shelf generate effects on spatio-temporal distribution of primary producers. To determine the relationship between the distribution of primary producers and composition of sedimentary organic matter (SOM) are compared ?¹³C data of the present study (2011) with data reported in 1991 and 2004. The contribution of primary producers to the SOM was estimated using the model SIAR. The contribution of the mangrove to SOM, no significant difference between 1984 and 2011 with contributions of 38%, and 35% respectively. The contributions of seagrass, phytoplankton and macroalgae were significantly different. A decrease of the contribution of seagrasses in 12% between 1984 and 2011, was related to the decrease in the seagrass coverage during last 30 years in Terminos Lagoon (P <0.05, r = 0.92). The results confirm that the degree of contribution of primary producers to SOM is related to the coverage of vegetation in the lagoon. The mangrove contribution to SOM has little change in the last 3 decades, being an important component of the export material of the lagoon system toward the adjacent sea, while the contribution of seagrass tends to decrease as a result of the loss in coverage.

Palabras clave: isotopes; sedimentary organic matter; primary producers; SIAR

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