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Title: Sediment oxygen consumption in a developed coastal lagoon of the Mexican Caribbean
Authors: Valdes-Lozano, David S.
Chumacero, Marcela
Real, Elizabeth
Keywords: Sediment
Oxygen consumption
Mexican-Caribbean coast
Issue Date: Sep-2006
Publisher: CSIR
Abstract: Nichupte is estuarine lagoon connected to the Caribbean Sea by two channels with very high levels of organic carbon in sediments, which ranged from 1.56 to 9.29 %, with the maximum concentration at the northeastern zone, known as Bojorquez, a section with high greater anthropogenic impacts. The rate of sediment oxygen consumption (measured in the laboratory) during summer (July) was 292 mmol O₂ m⁻² d⁻¹ at Bojorquez, with a mean value of 70 mmol O₂ m⁻² d⁻¹. During winter (January), at the same site, the rate increased to 309 mmol O₂ m⁻² d⁻¹ (average 125 mmol O₂ m⁻² d⁻¹). The total average for both seasons (summer and winter) was 97 mmol O₂ m⁻² d⁻¹. For the whole lagoon system (48.3 km²), the total oxygen consumption by sediments was 4.6 × 106 mol O₂ d⁻¹. During summer, the net input of oxygen from the sea to the lagoon was 1.6 × 105 mol O₂d⁻¹, decreasing towards winter (1.5 × 105 mol O₂d⁻¹). The oxygen input from sea to lagoon, represented only 3 % of the oxygen consumed by sediments, indicating that, if some of the oxygen sources like photosynthesis or wind re-aeration are interrupted or diminished, hypoxia might occur, particularly at Bojorquez zone.
Page(s): 227-234
Source: IJMS Vol.35(3) [September 2006]

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