Field-cage experiments on host fidelity in a pair of sympatric phytophagous ladybird beetles
Field-cage experiments on host fidelity in a pair of sympatric phytophagous ladybird beetles
复制标题
DOI：
10.1111/j.1570-7458.2006.00365.x
复制
发表时间：
2006-02-01
影响因子：
1.9
通讯作者：
Katakura, H
中科院分区：
文献类型：
--
作者：
Hirai, Y;Kobayashi, H;Katakura, H
使用田间笼，我们测试的假设，两个植食性瓢虫，Henosepilachna niponica（刘易斯）和Henosepilachna yasutomii片仓（鞘翅目：瓢虫科：Epilachninae），生殖隔离彼此的主机保真度。我们种植了这两种植物的寄主植物[菊科蓟蓟CirsiumalpicolaNakai]。niponica和蓝升麻Caulophyllum robustum Maxim.（Berberidaceae），H. yasutomii]，并将两种宿主植物和甲虫的常见食物植物日本茄（Solanum japonense Nakai）（茄科（Solanaceae））种植在其它笼（BJT笼）中。然后，我们释放越冬繁殖甲虫到这些笼子里，并记录他们的传播，卵群的分布，交配的发生率。在BT笼中，甲虫几乎只在自己的宿主植物之间移动，所有雌性都只在自己的宿主植物上产卵。在BJT笼中，甲虫在自己的寄主植物和日本茄之间移动，导致偶尔在同一茄属植物上进行种间交配。这两个物种的女性产卵在自己的寄主植物以及日本茄。这些结果表明，寄主的忠诚度是阻碍基因在H. niponica和H.安富井。然而，如果有第三种植物在甲虫种群之间架起桥梁，这一屏障就很容易被打破。
Using field cages, we tested the hypothesis that two phytophagous ladybird beetles, Henosepilachna niponica (Lewis) and Henosepilachna yasutomii Katakura (Coleoptera: Coccinellidae: Epilachninae), are reproductively isolated from each other by their host fidelity alone. We planted host plants of the two species [the thistle Cirsium alpicola Nakai (Asteraceae) for H. niponica and the blue cohosh, Caulophyllum robustum Maxim. (Berberidaceae), for H. yasutomii] in 7 x 7 m cages (BT cages), and planted the two host plants and the beetles' common food plant, the Japanese nightshade, Solanum japonense Nakai (Solanaceae), in other cages (BJT cages). We then released overwintered reproducing beetles into these cages and recorded their dispersal, the distribution of egg masses, and the incidence of copulations. In BT cages, the beetles moved almost exclusively between their own host plants, and all females laid eggs exclusively on their own host plants. In BJT cages, the beetles moved between their own host plants and the Japanese nightshade, resulting in occasional interspecific mating on the same nightshade plant. Females of both species laid eggs on their own host plants as well as on the Japanese nightshade. These results indicate that host fidelity functions as a strong barrier against gene flow between H. niponica and H. yasutomii. However, this barrier can easily be broken down if a third plant species bridges the beetle populations.