COMPARATIVE-ASSESSMENT OF THE AEROBIC AND ANAEROBIC MICROFLORAS OF EARTHWORM GUTS AND FOREST SOILS

被引:114
作者
KARSTEN, GR [1 ]
DRAKE, HL [1 ]
机构
[1] UNIV BAYREUTH, BITOK, LEHRSTUHL OKOL MIKROBIOL, D-95440 BAYREUTH, GERMANY
关键词
D O I
10.1128/AEM.61.3.1039-1044.1995
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Aerobic and anaerobic microbial potentials of guts from earthworms (Lumbricus iEus rubellus Hoffmeister and Octolasium lacteum (Oerl.)) collected from a beech forest were evaluated. On the basis of enumeration studies, microbes capable of growth under both aerobic and anaerobic conditions were more numerous in the earth-worm intestine than in the beech forest soil from which the worms were obtained. The intestine of worms displayed nearly equivalent aerobic and anaerobic microbial grow th potentials; in comparison, soils displayed greater aerobic than anaerobic microbial growth potentials. Hence, the ratio of microbes capable of growth under obligately anaerobic conditions to those capable of growth under aerobic conditions was higher with the worm intestine than with the soil. Process Level studies corroborated these population differentials: (i) under anaerobic conditions, worm gut homogenates consumed glucose, cellobiose, or ferulate more readily than did soil homogenates; and (ii) under aerobic conditions, worm gut homogenates consumed cellobiose or oxygen more readily than did soil homogenates. Collectively, these results reinforce the general concept that the earthworm gut is not microbiologically equivalent to soil and also suggest that the earthworm gut might constitute a microhabitat enriched in microbes capable of anaerobic growth and activity.
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页码:1039 / 1044
页数:6
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