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The role of termites in an equatorial rain forest ecosystem of West Malaysia

I. Population density, biomass, carbon, nitrogen and calorific content and respiration rate

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Summary

  1. 1.

    Density of nests, population number, biomass, nitrogen and carbon content, calorific content and respiration rate of termites were studied at Pasoh Forest, West Malaysia mainly with four dominant species of epigeous nest builders, Macrotermes carbonarius, Dicuspiditermes nemorosus type-a, type-b and Homallotermes foraminifer, to reveal their role in the ecosystem.

  2. 2.

    The density of nests or mounds was 15–41/ha in M. carbonarius, 60–110/ha in the two types of D. nemorosus and 85–165/ha in H. foraminifer.

  3. 3.

    The population number per nest or mound was about 88,000 in M. carbonarius, 45,000 in D. nemorosus type-a, 47,000 in D. nemorosus type-b and 13,000 in H. foraminifer. The population number per hectare was about 1.8x106 for M. carbonarius, 4.3x106 for D. nemorosus type-a, 5.2x106 for D. nemorosus type-b and 2.1x106 for H. foraminifer.

  4. 4.

    The ratio in number of workers to soldiers was 6.4 for M. carbonarius, 19.0 for D. nemorosus type-a, 23.1 for D. nemorosus type-b and 8.9 for H. foraminifer. The ratio in number of adults (workers plus soldiers) to larvae was 1.4 for M. carbonarius, 0.59 for D. nemorosus type-a, 1.76 for D. nemorosus type-b and 3.84 for H. foraminifer.

  5. 5.

    The number of adults per nest of D. nemorosus type-a, type-b and H. foraminifer was linearly correlated with the weight of nest on the log-log coordinates.

  6. 6.

    The ratio of dry body weight to live weight was 0.24–0.30 for workers, 0.19–0.29 for soldiers and 0.15–0.22 for larvae.

  7. 7.

    The ash content of termite body was 26–66% for workers, 2–24% for soldiers and 1–4% for larvae.

  8. 8.

    The carbon content ranged from 45% to 66% of ash-free dry weight and the nitrogen content from 5.6% to 12.6%.

  9. 9.

    The mean calorific value of termite body was 5.3 gcal/mg in workers and soldiers on an ash-free weight basis, but was greater in nymphs and winged reproductives in the nest (6.7–6.9 gcal/mg) owing probably to their large fat storage.

  10. 10.

    The relation of CO2 evolution rate to temperature in these termites was similar to what has been found in other insects.

  11. 11.

    The total biomass of the four termite species was estimated at 6.01 kg ash-free dry weight/ha, equivalent to 0.55 kg nitrogen/ha and 3.09 kg carbon/ha.

  12. 12.

    The role of the fungi cultivated by M. carbonarius on their fungus combs was discussed in relation to the nutrition of termites and the decomposition of leaf-litter with special reference to their nitrogen metabolism. The high nitrogen content of fungus spherules growing on fungus combs seemed to have an important bearing on the nutrition of termites.

  13. 13.

    It was concluded that the termites played a very important role in the organic matter decomposition cycle of Pasoh Forest.

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Authors and Affiliations

  1. Department of Biology, Faculty of Science, Tokyo Metropolitan University, Tokyo

    Tadao Matsumoto

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  1. Tadao Matsumoto
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Japanese Contribution No. 3, IBP Pasoh Forest Project.

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Matsumoto, T. The role of termites in an equatorial rain forest ecosystem of West Malaysia. Oecologia 22, 153–178 (1976). https://doi.org/10.1007/BF00344714

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