渓流における生葉の分解過程とシュレッダーの定着 Decomposition of fresh leaves and colonization by shredders in a small mountain stream

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著者

    • 河内 香織 KOCHI Kaori
    • 信州大学理学部生物科学科:(現)東京大学大学院農学生命科学研究科森林動物学研究室 Department of Bioscience, Faculty of Science, Shinshu University

抄録

Decomposition of fresh leaves of deciduous trees and colonization by macroinvertebrate shredders were studied in a mountain stream in Nagano Prefecture, central Japan. Decomposition experiments were carried out from late June to mid August ("summer experiment") and from early October to late November ("autumn experiment") in 1998. Two types of litter bag (9-mm mesh and 0.4-mm mesh) were used in these experiments to examine the role of shredders in leaf decomposition. Decomposition rates (ks) of fresh leaves calculated using an exponential decay model were faster (k=0.0073-0.0935) than most of the known rates for senescent leaves. The fresh leaves were subjected to a higher degree of microbial and shredder processing because of their lower C/N ratio. Decomposition rates in the summer experiment were higher than in the autumn experiment for both types of mesh bag. Decomposing activities of microbes and/or small shredders would have been higher in the summer experiment, when the C/N ratio of the leaves was lower and the stream temperature was higher. In the early stage of decomposition during the summer experiment, the biomass of shredders colonizing the coarse mesh bags was very large, due to colonization by many large, mature caddisfly larvae (i. e. Pseudostenophylax and Goerodes), while significant effects of mesh size on leaf decomposition were detected. These results suggest that in streams during early summer, when several shredder species are often at a mature stage even though coarse organic detritus is limited, input of high-quality fresh leaves is an important food resource for these shredders.

収録刊行物

  • 日本生態学会誌

    日本生態学会誌 52(3), 331-342, 2002

    一般社団法人 日本生態学会

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各種コード

  • NII論文ID(NAID)
    110001887249
  • NII書誌ID(NCID)
    AN00193852
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0021-5007
  • NDL 記事登録ID
    6418581
  • NDL 雑誌分類
    ZR3(科学技術--生物学--植物)
  • NDL 請求記号
    Z18-43
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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