ウリミバエの大量累代増殖系統と野生系統の交尾能力および交尾競争力

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  • Comparison of Mating Ability and Mating Competitiveness between Mass-reared and Wild Strains of the Melon Fly, <i>Dacus cucurbitae</i> COQUILLETT (Diptera: Tephritidae)
  • ウリミバエ ノ タイリョウ ルイダイ ゾウショク ケイトウ ト ヤセイ ケイト

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Mating ability and mating competitiveness were compared between mass-reared and wild strains of the melon fly, Dacus cucurbitae COQUILLETT. Mass-reared (L-) strain originated from the culture maintained for about 33-41 generations under artificial rearing conditions in the Mass-rearing Facilities in Ishigaki Is. Wild (W-) strain was collected from infested fruit, or was caught by a cue-lure trap in the field. When a pair of male and female flies were confined in a cage (30×30×45cm), the percentage of mated pairs was larger in L-strain than in W-strain. Supply of some pieces of sliced pumpkin in the cage increased mating ability of W-strain. In the four experiments, in which three different combinations of flies such as (1) W-female, W-male, L-male, (2) L-female, W-male, L-male, (3) W-male, W-female, L-female, (4) L-male, W-female, L-female, were confined in a cage, L-male×L-female pair mair mated most frequently, and W-male×W-female pair mated infrequently. In the experiments using larger cages (180×180×180cm) or when the smaller density of flies per cage was lower, mating competitiveness of W-males increased and that of L-males decreased. These results suggest that L-strain is adapted to artificial diet and narrow space under massrearing conditions. It was concluded that the evaluation of mating-competitiveness of the mass-reared sterile males in the small-cage experiments can not give a precise indication of the competitiveness under field conditions.

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