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1Laboratório de Limnologia, Departamento de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro,

By Claudio Cardoso Marinho, Cleber Palma-silva, Edélti Faria Albertoni, Iara Bueno Giacomini, Marcos Paulo, Figueiredo Barros, Leonardo Marques Furlanetto and Francisco De Assis Esteves

Abstract

Aquatic macrophytes in shallow lakes emit high levels of methane. We hypothesize that the pres-ence of emergent aquatic macrophytes in an artificial shallow lake promotes important input of autochthonous organic matter (OM) in sediment and higher levels of methane emission via bub-bles. Samplings were performed at three sites in a small, shallow subtropical lake: (1) one station in the limnetic region and (2)- (3) two stations in the littoral region ((2) inside and (3) outside aquatic macrophyte stands). A higher concentration of OM was observed at the macrophyte sta-tion, and within this site, a higher methane concentration was observed in the sediment. These results could explain the methane ebullition values at macrophyte sites. At the macrophyte station, methane emission via bubbles contributed 17 % to 56 % of the total methane emission; however, at the other stations, its contribution via bubbles, was lower than 1%. This research confirmed the importance of emergent macrophytes at Polegar Lake as a source of OM in sediment and methan

Year: 2015
OAI identifier: oai:CiteSeerX.psu:10.1.1.1019.6778
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