Seasonal dynamics of methane in the water column of two subtropical lakes differing in trophic status

Brazilian Journal of Biology

Cc. Marinho²  C. Palma Silva¹  Ef. Albertoni¹  Cr. Trindade¹  Fa. Esteves² 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Biologia Laboratório de Limnologia

关键词: methane;    eutrophication;    methanogenesis;    methanotrophy;    subtropical lakes;    metano;    eutrofização;    metanogênese;    metanotrofia;    lagos subtropicais;   

DOI  :  10.1590/S1519-69842009000200007

来源: SciELO

【 摘 要 】

Alterations in methane concentration in the water column of aquatic systems is closely linked to the processes of production and consumption of this gas, i.e., methanogenesis and methanotrophy respectively. The aim of this research is to evaluate methane dynamics through diurnal variation in the concentration of this gas in the water column of two lakes differing in trophic status at the campus of Fundação Universidade do Rio Grande (FURG). In two sampling periods (November 2001 and July 2002) methane concentrations in the water column were significantly higher (3.66 and 0.41 μmoles.L-1, respectively) at Lago dos Biguás, with mesoeutrophic features when related to Lago Polegar (1.43 and 0.19 μmoles.L-1, respectively) which has oligotrophic features. The higher methane concentrations were detected in November 2001 when higher temperature was also detected. The results highlighted the importance of trophic status as well as seasonality for the methane dynamics in these ecosystems.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License