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|Title:||Sediment oxygen consumption in a developed coastal lagoon of the Mexican Caribbean|
|Authors:||Valdes-Lozano, David S.|
|Keywords:||Sediment;Nichupte;Bojorquez;Oxygen consumption;BOD;Lagoon;Mexican-Caribbean coast|
|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.|
|Appears in Collections:|| IJMS Vol.35(3) [September 2006]|
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