Methane levels in shallow subtropical lake sediments: Dependence on the trophic status of the lake and allochthonous input |
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| Authors: | Leonardo M Furlanetto Claudio C MarinhoCleber Palma-Silva Edélti F AlbertoniMarcos Paulo Figueiredo-Barros Francisco de Assis Esteves |
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| Institution: | a Laboratório de Limnologia, Instituto de Ciências Biológicas - ICB, Universidade Federal do Rio Grande - FURG, Av. Itália, Km 8, Campus Carreiros, Rio Grande, RS, Post Office Box 474, Brazil
b Departamento de Ecologia, Laboratório de Limnologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro - UFRJ, Brazil |
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| Abstract: | The vertical sediment profiles (10 cm) of the margins of three shallow subtropical lakes (Rio Grande, Brazil) with different trophic states and surrounding areas were evaluated to identify the effects of the allochthonous input on the methane concentration in the sediment. Sediment cores were collected to quantify the organic matter content (OM) and total carbon (TC), total nitrogen (TN), total phosphorous (TP) and methane (CH4) concentrations.The three lakes were distinguished according to the trophic status and classified as oligotrophic, dystrophic and eutrophic. The natural characteristics of the dystrophic and eutrophic lakes have been changed due to the allochthonous input of leaves and twigs (Eucalyptus sp.) and the excreta of birds, respectively. In the eutrophic lake, the allochthonous input contributed to high autochthonous production. The highest values of OM, TC, TN and TP were found in the superficial sediments of the dystrophic and eutrophic lakes. The accumulation of allochthonous organic matter in the littoral zone promoted changes in the vertical sediment profiles and contributed to increases in the CH4 concentrations in the sediment. |
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| Keywords: | Eucalyptus sp Excreta of birds Sediment profile Nutrients |
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