How do insect seed predators adapt to general flowering in Southeast Asian tropical rainforests?

东南亚的龙脑香树每2至10年开花和结果。本文研究了龙脑香种子天敌对龙脑香种子生产波动的适应性。种子象甲的分子遗传学研究表明，近缘象甲并不总是使用近缘的龙脑香种。这意味着象鼻虫可能已经改变或扩大了它们的宿主，以应对不可预测的播种物候。龙脑香种子中的象甲幼虫有两种类型，一种在落果后不久即以成虫出现，另一种则以幼虫存在一年以上。这说明有些幼虫在非结果期有休眠现象。

Dipterocarp trees in Southeast Asia are known to flower and fruit every 2 to 10 years. In the present study, how insect seed predators on dipterocarps adapt to the largely fluctuated seed production of dipterocarps was examined. Molecular phylogeny of the seed weevils showed that closely-related weevils did not always use closely-related dipterocarp species. This implies that weevils might have altered or expanded their hosts to deal with the unpredictable seeding phenology. Also, there were two types of weevil larvae in seeds of dipterocarps; one emerged as adults soon after fruit-fall while the other remains as larvae more than one years. This implies that some larvae have dormancy to survive during non-fruiting period.