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Titolo:
The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil
Autore:
Kajan, R; Frenzel, P;
Indirizzi:
Max Planck Inst Terr Mikrobiol, D-35043 Marburg, Germany Max Planck Inst Terr Mikrobiol Marburg Germany D-35043 Marburg, Germany
Titolo Testata:
FEMS MICROBIOLOGY ECOLOGY
fascicolo: 2, volume: 28, anno: 1999,
pagine: 121 - 129
SICI:
0168-6496(199902)28:2<121:TEOCLO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEDIMENT LAKE-CONSTANCE; METHANOTROPHIC BACTERIA; SURFACE-LAYER; PADDY SOIL; MARINE-SEDIMENTS; PLUMOSUS LARVAE; SULFATE; AMMONIUM; EMISSION; RATES;
Keywords:
methane production; methane oxidation; bioturbation; chironomidae; paddy soil;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Frenzel, P Maxnylanck Inst Terr Mikrobiol, Karl Von Frisch Str, D-35043 Marburg, Germa Max Planck Inst Terr Mikrobiol Karl Von Frisch Str Marburg Germany D-35043
Citazione:
R. Kajan e P. Frenzel, "The effect of chironomid larvae on production, oxidation and fluxes of methane in a flooded rice soil", FEMS MIC EC, 28(2), 1999, pp. 121-129

Abstract

Tube-dwelling invertebrates affect microbial processes by feeding on sediment bacteria, by creating structures with properties different from that ofthe bulk sediment, by disturbing the benthic boundary layer, and by pumping water through their tubes. We studied the effects of Chironomidae in a flooded soil. Tubes were at least 1.5 cm long and ca. 2 mm in diameter, and extended through the anoxic subsurface soil over most of their length. Larvae had no effect on CH4 flux across the sediment surface either by diffusionor by ebullition. In vitro, CH4 oxidation rates in tubes were significantly (P < 0.05) higher than those in surface and subsurface soil. At a mixing ratio of 20 000 ppm(v), average CH4 oxidation rates of tubes, surface soil,and bulk soil were 2, 0.4, and 1 mu mol g dry wt.(-1) h(-1), respectively. The number of CH4 oxidizing bacteria determined by the most probable number (MPN) technique was higher in chironomid tubes than in the other soil compartments. CH4 production in tubes was significantly (P < 0.05) higher thanin the anoxic bulk soil, while no CH4 was produced in the surface soil during 240 h of incubation. We conclude that chironomid tubes are microsites with an intensified microbial activity, where CH4 production and oxidation may be rightly coupled. (C) 1999 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 00:32:08