Geochemical and micropaleontological evidence of recent hydrological changes in sedimentary records of Jiquilisco Bay, El Salvador

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Oscar Armando Amaya-Monterrosa
María Luisa Machain-Castillo
Ana Carolina Ruiz-Fernández
Joan Albert Sanchez-Cabeza
Arturo Carranza-Edwards
Alejandro Cearreta
Mayumi Amparo Cabrera-Ramírez
Jaime Espinoza-Navarrete
Estephanie Meza-Guerrero
Libia Hascibe Pérez-Bernal
Alejandro Rodríguez-Ramírez

Abstract

The geochemical, mineralogical, and micropaleontological (Foraminifera, Ostracoda, Bacillariophyta) spatial and temporal variations in marshland sediments from the Jiquilisco Bay Biosphere Reserve, El Salvador, are described. The sedimentary characteristics of two marsh sites reveal contrasting sedimentary environments: site Los Cedrones depicts a high energy environment with sandy sediments, low organic matter content, and no microfossils, while site El Gimidor represents a lower energy environment with muddy sediments rich in organic matter and more abundant and diverse microfossils. 210Pb-dated sedimentary cores showed changes over time (last 100 years) in the mineral and elemental composition, as well as in the accumulation rates, suggesting changes in the type and magnitude of sediments delivered to the sites. Sediment accumulation rates were similar at both sites, ranging from 1.2 ± 0.9 to 3.4 ± 0.5 mm yr–1 at Los Cedrones and from 0.8 ± 0.2 to 4.0 ± 0.5 mm yr–1 at El Gimidor. Even though both marshes are located 13 km apart, and depict different sedimentary environments, elemental composition, and microfossil assemblages, both sedimentary records show the influence of hydrological changes, probably due to the damming of the Lempa River and the sea-level increase during the last 100 years. 

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How to Cite
Amaya-Monterrosa, O. A., Machain-Castillo, M. L., Ruiz-Fernández, A. C., Sanchez-Cabeza, J. A., Carranza-Edwards, A., Cearreta, A., … Rodríguez-Ramírez, A. (2015). Geochemical and micropaleontological evidence of recent hydrological changes in sedimentary records of Jiquilisco Bay, El Salvador. Ciencias Marinas, 40(4), 305–320. https://doi.org/10.7773/cm.v40i4.2475
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Research Article

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