STRUCTURE AND ENERGETICS OF THE POPULATION OF LIGIDIUM JAPONICA (ISOPODA) IN A WARM TEMPERATE FOREST ECOSYTEM

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  • SAITO Susumu
    Department of Biology, Faculty of Science, Tokyo Metropolitan University

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The size distribution, regression of the female body length on egg numbers in a brood, the body weight-length relation and the population density of Ligidium japonica were investigated at the warm temperate evergreen broad leaf forest of Mt. Kiyosumi, Boso Peninsula, Japan. From these measurements and from the rate of respiration and the calorific content of the animal, the amounts of production and respiration of the population were estimated. The amount og reproduction in dry weight for the population was estimated at 273.8 mg/m^2/year, or 1.40 kcal by using the calorific value 5.1 gcal/mg dry weight. The growth of them was estimated at 3285 mg fresh weight/m^2/year, or 2.13 kcal. The production for the population amounted to 3.5 kcal/m^2/year. The annual oxygen consumption of the animals was estimated at 3268 O_2 cc, c^2. Using the coeffccient 4.9 gcal/O_2 cc, the respiratory energy loss for the population was estimated at 16.0 kcal/m^2/year. The annual metabolism for the Ligidium population therefore amounted to 19.5 kcal/m^2 from September 1962 to August 1963. It was estimated that about 80 per cent of energy assimilated Ly the Ligidium japonica population was consumed for their respiration.

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