Influences of Individuals in Aggregation or Isolation on the Development and Survival of the Larvae of <i>Artona funeralis</i>

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  • タケノホソクロバ幼虫の集団の大きさがその発育と死亡率とに及ぼす影響
  • タケノホソクロバ ヨウチュウ ノ シュウダン ノ オオキサ ガ ソノ ハツイク ト シボウリツ ト ニ オヨボス エイキョウ

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A. funeralis lays eggs in mass on the leaf of bamboo-grass. After larvae keep in a compact aggregation up to the third instar, they gradually disperse out.<br>The present laboratory experiment was carried out to clear up the influences of individual number on the survival and development of the larvae.<br>The larvae hatched from an egg-mass were reared at 1, 5, 10 and 20 individuals per vessel under the constant temperature of 27.5°C and the natural day length in laboratory.<br>When the larvae were kept isolated, some of them did not feed and then died. In the first instar, they showed the highest mortality (15%) of the densities tested.<br>On the other hand, when 10 or 20 individuals were reared together, they did not die at all during early instars, but their mortality became higher than less crowded individuals after the third moult.<br>The larval duration intended to increase with increasing the number of individuals in aggregation, because the larvae reared at 5, 10 and 20 individuals had longer duration and more instars. Especially, they had as long duration as isolated one up to the third instar but took longer at the forth instar.

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