论文信息 - Estimating production of litter-decomposing fungi in streams from rates of acetate incorporation into ergosterol

Estimating production of litter-decomposing fungi in streams from rates of acetate incorporation into ergosterol

As fungi decompose leaf lirrer, rhey penerrare and grow wirhin leaf rissue. Since fungi are in inrimare conracr wirh and hidden wirhin rhe lirrer rhar rhey are decomposing, quanrirarive dara on rheir biomass and growrh rares have been difficulr ro obrain. To address rhis problem, ergosrerol has been used as a quanrirarive indicator of fungal biomass. Ergosterol is the major membrane-associated sterol in mosr eumycotic fungi; i t is absent from most other organisms and it can be readily extracted and measured from natural samples (GESSNER & NEWELL 1997). In addirion, a method ro esrimate instanraneous growrh rates of ergosterol-containing fungi in siru from incorporation rates of radiolabeled acerare inro ergosrerol (acetate incorporation method) has recenrly been described (NEWELL & FALLON 1991). This method is significanr since estimares of growth rates together with fungal biomass can be used to calculate production of fungi associated with plant litter. The acetate incorporation method has been used to estimate the production of litter-decomposing fungal communities associated wirh decaying sai t marsh grass (NEWELL & fALLON 1991, NEWELL et al. 1996), a freshwater sedge (NEWELL et al. 1995) and decomposing deciduous tree leaves in srreams (SUBERKROPP 1995, 1997, WEYERS & SUBERKROPP 1996, GESSNER & eHAUVET 1997, BALDY & GESSNER 1997).

K. Suberkropp

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