Researches on Population Ecology

, Volume 9, Issue 2, pp 192–200 | Cite as

Studies on interspecies competition between the azuki bean weevil,Callosobruchus chinensis, and the southern cowpea weevil,C. maculatus II. Competition under different environmental conditions

  • Koichi Fujii


The experimental studies was done on the interspecies competition between the azuki bean weevil,Callosobruchus chinensis, and the southern cowpea weevil,C. maculatus, under the different environmental conditions.
  1. 1)

    At 30°C, 70% R. H., the change of food replenishment interval had no influence upon the competition results, and the competition always ended in the extinction ofC. maculatus. But there was a tendency for the period of co-existence to be elongated as the interval of replenishment lengthened.

  2. 2)

    At 30°C, 70% R. H., there were no differences in the competition processes and results between the competition using the dry bean (water content about 11%) or the normal one (about 15%).

  3. 3)

    At 32°C, 64% R. H., the competition result was reversed from that at 30°C, 70% R. H. This is thought to be due to the differences of the developmental rates and the numbers of eggs oviposited between the two species at these conditions.

  4. 4)

    In some cases the competition result could be understood from the point of the phenomena of single species populations of both species, but in other cases, the results were in conflict with the expectation from those phenomena. To analyze the competition mechanism, it is necessary to investigate the interaction between species.



Developmental Period Azuki Bean Competition Process Store Product Insect Competition Result 
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Copyright information

© The Society of Population Ecology 1967

Authors and Affiliations

  • Koichi Fujii
    • 1
  1. 1.Entomological LaboratoryKyoto UniversityKyotoJapan

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