Authors: Leal, João José Fonseca; Enrich-Prast, Alex; de Assis Esteves, Francisco; Bozelli, Reinaldo; Farjalla, Vinicius Fortes

Source: Archiv für Hydrobiologie, Volume 162, Number 4, April 2005 , pp. 557-574(18)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

Abstract:

Oxygen uptake rates and vertical profiles were determined in sediment taken from natural areas and areas impacted by bauxite tailings in Lake Batata, and in the U-shaped burrows constructed by the nymphs of the benthic ephemeropteran Campsurus notatus, under laboratory conditions.Sediment from impacted and natural areas containing different densities of nymphs of C. notatus (0 to 1,200 ind. m^-2) were incubated in acrylic cores. In sediment from the natural area, O₂ was present only in the upper 3.5 mm. In the impacted area, the aerobiclayer was deeper, with O₂ detected down to 6.5 mm depth. O₂ uptake was twice as high in sediment from the natural area (1.11 mmol O₂ m^-2 h^-1) as from the impacted area (0.61 mmol O₂ m^-2 h^-1).In cores containing nymphs of C. notatus, O₂ uptake was significantly higher than in sediments without C. notatus. The increase in the rates of O₂ uptake was positively correlated with the biomass of the nymphs (gDW m^-2). The presence ofC. notatus resulted in alteration of the O₂ profiles in the sediment of both areas, indicating the importance of these larvae in structuring O₂ profiles in the sediments of Lake Batata.

Keywords: BIOTURBATION; AMAZONIAN LAKE; CAMPSURUS NOTATUS; IMPACTED SEDIMENT; OXYGEN

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0003-9136/2005/0162-0557

Publication date: 2005-04-01

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