Hsu Yu-Hsun, Cocroft Reginald B, Snyder Robert L, Lin Chung-Ping
Department of Life Science National Taiwan Normal University Taipei Taiwan.
Division of Biological Sciences University of Missouri Columbia MO USA.
Ecol Evol. 2018 Jan 15;8(4):1954-1965. doi: 10.1002/ece3.3815. eCollection 2018 Feb.
The importance and prevalence of phylogenetic tracking between hosts and dependent organisms caused by co-evolution and shifting between closely related host species have been debated for decades. Most studies of phylogenetic tracking among phytophagous insects and their host plants have been limited to insects feeding on a narrow range of host species. However, narrow host ranges can confound phylogenetic tracking (phylogenetic tracking hypothesis) with host shifting between hosts of intermediate relationship (intermediate hypothesis). Here, we investigated the evolutionary history of the complex of treehoppers. Each species in this complex has high host fidelity, but the entire complex uses hosts across eight plant orders. The phylogenies of were reconstructed to evaluate whether (1) tracking host phylogeny; or (2) shifting between intermediately related host plants better explains the evolutionary history of . Our results suggest that primarily shifted between both distant and intermediate host plants regardless of host phylogeny and less frequently tracked the phylogeny of their hosts. These findings indicate that phytophagous insects with high host fidelity, such as , are capable of adaptation not only to closely related host plants but also to novel hosts, likely with diverse phenology and defense mechanisms.
由共同进化以及在亲缘关系密切的宿主物种之间转移所导致的宿主与依赖生物之间系统发育追踪的重要性和普遍性，已经争论了数十年。大多数关于植食性昆虫及其宿主植物之间系统发育追踪的研究都局限于以狭窄范围的宿主物种为食的昆虫。然而，狭窄的宿主范围可能会将系统发育追踪（系统发育追踪假说）与中间关系宿主之间的宿主转移（中间假说）相混淆。在此，我们研究了角蝉复合体的进化历史。该复合体中的每个物种都具有高度的宿主专一性，但整个复合体利用跨越八个植物目级别的宿主。重建了……的系统发育树，以评估是（1）追踪宿主系统发育；还是（2）在中间关系的宿主植物之间转移能更好地解释……的进化历史。我们的结果表明，……主要在远缘和中间宿主植物之间转移，而不管宿主系统发育如何，并且较少追踪其宿主的系统发育。这些发现表明，具有高度宿主专一性的植食性昆虫，如……，不仅能够适应亲缘关系密切的宿主植物，还能够适应具有不同物候和防御机制的新宿主。
