ツヅレサセコオロギの長翅型発現率に及ぼす飼育密度の影響について

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タイトル別名
  • THE EFFECT OF THE POPULATION DENSITY ON THE OCCURRENCE OF THE MACROPTEROUS FORM IN A CRICKET, SCAPSIPEDUS ASPERSUS WALKER : ORTHOPTERA, GRYLLIDAE
  • ツズレサセコオロギ ノ チョウシガタ ハツゲンリツ ニ オヨボス シイク ミツド ノ エイキョウ ニ ツイテ

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説明

Tthe effect of the population density on the occurrence of the dimorphic features in a cricket, Scapsipedus aspersus WALKER is reported is this paper. In the present cricket there are the macropterous form (M-form) and the brachypterous form (B-form). The former is rarely found in the field. The occurrence of the M-form was studied under the various rearing densities in the Petri dish (12 cm in diameter, 7 cm high). The result is that the occurrence percentage of the M-form is the lowest when insects are reared solitarily and increases with the increase of the density to the maximum effect and then decreases as the density increases further. Judging from the fact that when the present cricket is reared being isolated by a wire-gauze in the various rearing spaces respectively corresponding to ones in the experiment above, the occurrence percentage of the M-form is always low showing the values similar to the solitary rearing of the above experiment, the occurrence of the M-form seems to be related to the direct contact among insects. As the cutting of the antennae makes all the crickets develop to the B-form in the group culture, it seems that the antennae plays an important role in the density effect and the lowering of the occurrence percentage of the M-form as the high density is related to the wound induced by the living under the high density.

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