Ecological Studies on the Cupreous Chafer, <i>Anomala cuprea</i> HOPE (Coleoptera)

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  • NISHIGAKI Jojiro
    Laboratory of Applied Entomology, Faculty of Agriculture, Shizuoka University

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Other Title
  • ドウガネブイブイの生態学的研究
  • ドウガネブイブイの生態学的研究 III. : 初期幼虫密度の生存におよぼす影響
  • ドウガネブイブイ ノ セイタイガクテキ ケンキュウ 3 ショキ ヨウチュウ ミツド ノ セイゾン ニ オヨボス エイキョウ
  • III. The Effect of Initial Density of Larval Population on Its Survivorship
  • III. 初期幼虫密度の生存におよぼす影響

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Various population densities of newly-hatched larvae of the cupreous chafer were reared in pots filled with mixture of fallen leaves and natural soil throughout nearly all the larval period and the larval numbers were counted at regular intervals. A remarkable effect of the initial density was observed in the larval survivorship. At lower initial densities, the survival rates of larvae decreased slowly with the time as a straight line in logarithmic scale and they kept still high levels at the end of the experiment. In higher densities, however, the rates decreased rapidly at the early period, and then slowly, reaching extremly low final levels.<br>Larval density seems to converge to a certain density level regardless of the initial density.<br>The fact might be due to the existence of limit of the larval survival for a given space.<br>Furthermore, when examing this converged level, there existed the optimum initial density producing the maximum final density. The high mortalities, occurring in early larval period, were highly density-dependent. This was probably not due to the low temperature in winter, the lack or excess of soil water content, any kind of predators, parasites nor the food shortage, but the fatal injury among the larvae encountered in the soil.

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