環境要因がトビムシ(Folsomia candida(WILLEM))の体長成長に与える影響の評価法の検討 : 有効評価時期の決定

抄録

Examination of measuring method of the effects of environmental factors on collembolan growth. Satoshi KANEDA, Nobuhiro KANEKO (Soil Ecology Research Unit, Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama-shi, 240-8501 Japan). A new method, based on body length growth of Collembola, was developed using a digital microscope in order to estimate the effects of environmental factors on collembolan growth. The digital microscope is useful for measuring body length repeatedly without killing animals. The body length of Folsomia Candida (WILLEM) increased very rapidly until first oviposition, and then the growth rate slowed. Body length decreased from 0.5 to 23.7% at oviposition. Due to the reduction in length observed during reproduction, body length before the onset of reproduction is a valid index of the effect of environmental factors on collembolan growth.