Spatio-temporal dynamics of host-shift in Henosepilachna vigintioctopunctata now in progress in Southeast Asia

在野外观察、食物选择试验、饲养试验和线粒体DNA序列分析的基础上，研究了茄绵瓢虫（Henosepilachna vigintioctopunctata）在东南亚寄主变化的时空动态。该物种的主要寄主植物被认为是茄科植物。然而，利用引进的豆科植物“centro”的种群广泛分布在马来半岛南部、爪哇、苏门答腊和加里曼丹西部。在更东部的地区，它们并不常见或不存在。DNA分析表明，在东南亚的solpudi喂养种群的中心喂养性状的多个起源。没有得到令人信服的证据证明H. vigintioctopunctata沿着这两种寄主植物，或为寄主从茄科植物到Centro的转变。即使是森特罗饲养种群表现出延长的幼虫期和小的身体大小的森特罗，这表明他们还没有完全适应这种植物的生理。

On the basis of field observations, food choice tests, rearing experiments and an analysis of mitochondrial DNA sequences, we studied spatio-temporal dynamics of host changes of Henosepilachna vigintioctopunctata in Southeast Asia. The primary host plants of this species are considered to be solanaceous plants. However, the populations utilizing an introduced legume "centro" were widespread in the southern part of the Malay Peninsula, Java, Sumatra, and western Kalimantan. They were not common or absent in more eastern areas. The DNA analysis suggested multiple origins of the centro-feeding trait in solanum-feeding populations in Southeast Asia. No convincing evidence was obtained for the divergence of H. vigintioctopunctata along the two host plants, or for the host change from solanum to centro. Even the centro feeding populations showed an extended larval period and small body size on centro, suggesting that they were not yet fully adapted physiologically to this plant.