Degradation of Plant-derived Carbohydrates in Wetlands

Abstract

Corbicula japonica is one of the most important bivalves in inland fishery resources. Stable isotopic studies have shown that it can assimilate plant-derived hard-degradable carbohydrates. Further studies revealed that this species has endogenous enzymes to digest these carbohydrates.We investigated the ability of various organisms to degrade hard-degradable carbohydrates in wetlands from subarctic to subtropical zones and found that they could contribute to their degradation.We found that the enzymes secreted from organisms would bind to the sediment and contribute to the degradation of cellulose. We defined these enzymes as "the environmental enzymes". Comparison of various sediments revealed that the binding abilities of the sediment for the environmental enzyme were ascribable to oxidized metal, organic matters and the ratio of sand, silt and clay.