大力神甲虫在一个形态连续体上的谱系分化指数

IF 3.2 1区 农林科学 Q1 ENTOMOLOGY Insect Systematics and Diversity Pub Date : 2021-11-01 DOI:10.1093/isd/ixab021
Jen-Pan Huang
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引用次数: 1

摘要

摘要:在多物种聚结模型下,建立了谱系分化指数(gdi)来辅助分子物种的划分,它已被证明可以划分遗传结构,但不一定是物种。虽然以往的研究利用荟萃分析表明gdi可以为区分分类上好的物种提供信息,但显示不同gdi值的差异的生物学和进化意义尚未得到研究。在亚马逊大力神甲虫系统中,gdi值的增加与物种分化的后期阶段有关。具体而言,gdi值为0.7或更高时,表明生物物种之间存在分歧,这些物种可以在地理邻近地区共存,同时保持其进化独立性。同种异域种之间的差异,通常被认为是亚特异性的,例如地理分类群可能存在或不存在形态上的差异,其gdi值落在物种划界模糊区(0.2 < gdi < 0.7)。然而,结果可能会受到抽样设计的极大影响,即,在运行分析时选择不同的地理种群和不同遗传群体的集中。不同的gdi值可能被证明是生物学和进化信息,如果从不同的经验系统调查额外的物种形成连续性,所获得的结果可能有助于客观地划分物种在综合分类时代。
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The Genealogical Divergence Index Across a Speciation Continuum in Hercules Beetles
Abstract The genealogical divergence index (gdi) was developed to aid in molecular species delimitation under the multispecies coalescent model, which has been shown to delimit genetic structures but not necessarily species. Although previous studies have used meta-analyses to show that gdi could be informative for distinguishing taxonomically good species, the biological and evolutionary implications of divergences showing different gdi values have yet to be studied. I showed that an increase in gdi value was correlated with later stages of divergence further along a speciation continuum in an Amazonian Hercules beetle system. Specifically, a gdi value of 0.7 or higher was associated with diverge between biological species that can coexist in geographic proximity while maintaining their evolutionary independence. Divergences between allopatric species that were conventionally given subspecific status, such as geographic taxa that may or may not be morphologically divergent, had gdi values that fell within the species delimitation ambiguous zone (0.2 < gdi < 0.7). However, the results could be drastically affected by the sampling design, i.e., the choice of different geographic populations and the lumping of distinct genetic groups when running the analyses. Different gdi values may prove to be biologically and evolutionarily informative should additional speciation continua from different empirical systems be investigated, and the results obtained may help with objectively delimiting species in the era of integrative taxonomy.
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来源期刊
CiteScore
5.30
自引率
8.80%
发文量
34
期刊最新文献
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