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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.35 [2006] >
IJMS Vol.35(3) [September 2006] >
| Title: | Sediment oxygen consumption in a developed coastal lagoon of the Mexican Caribbean |
| Authors: | Valdes-Lozano, David S.
Chumacero, Marcela
Real, Elizabeth |
| Keywords: | Sediment
Nichupte
Bojorquez
Oxygen consumption
BOD
Lagoon
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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