Divergent host use among cryptic species in the fungivorous ciid beetle Octotemnus laminifrons (Motschulsky, 1860), with descriptions of three new species from Japan
Divergent host use among cryptic species in the fungivorous ciid beetle Octotemnus laminifrons (Motschulsky, 1860), with descriptions of three new species from Japan
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DOI：
10.1111/syen.12321
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发表时间：
2019-01
影响因子：
4.8
通讯作者：
Takuya Kobayashi;T. Sota
中科院分区：
文献类型：
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作者：
Takuya Kobayashi;T. Sota
昆虫-寄主真菌联结是影响种群动态和种间相互作用的重要生态学特征。然而，由于分类学的不完全修订和宿主记录的不足，食菌甲虫的宿主真菌关系的细节仍然不清楚。我们对日本的苹果甲虫（鞘翅目：苹果甲虫科）及其隐种进行了分类学研究，并调查了这些苹果甲虫对真菌的宿主利用。线粒体细胞色素c氧化酶亚基I片段和两个核标记的最大似然系统发育分析恢复了四个支持良好的，单系群之间的标本先前确定为O。薄片状的。生殖器结构的定量分析显示这四个谱系之间的诊断差异。这些分子和形态学分析表明，目前鉴定为O. laminifrons实际上包括四种：O. laminifrons（Motschulsky，1860），O.相似小林& Sota sp.n.，O.厚叶藓（crassus小林& Sota sp.n.）和O.川边氏小林& Sota sp.n.本文对O. laminifrons和三个新物种的描述。这些物种在四种栓菌属和一种Lenzites物种中表现出不同的真菌宿主使用模式。我们还研究了这四个物种之间的系统发育关系的基础上限制性位点相关的DNA（RAD）序列数据，这提供了一个更可靠的系统发育树。我们讨论了真菌宿主使用的变化。我们的研究结果表明，密切相关的，同源食真菌昆虫表现出不同的实用模式密切相关的真菌物种，以前很少报道的现象。
Insect–host fungus associations are important ecological features that affect population dynamics and interspecific interactions. However, details of host fungus relationships in fungivorous beetles remain unclear due to incompletely revised taxonomy and insufficient host records. We conducted a taxonomic study of the ciid beetle Octotemnus laminifrons (Coleoptera: Ciidae) and its cryptic species in Japan and investigated fungal host‐use by these ciid beetles. Maximum‐likelihood phylogenetic analysis of mitochondrial cytochrome c oxidase subunit I fragments and two nuclear markers recovered four well‐supported, reciprocally monophyletic groups among specimens previously identified as O. laminifrons. Quantitative analyses of genital structures revealed diagnostic differences among these four lineages. These molecular and morphological analyses indicate that the ciid beetles currently identified as O. laminifrons actually comprise four species: O. laminifrons (Motschulsky, 1860), O. assimilis Kobayashi & Sota sp.n., O. crassus Kobayashi & Sota sp.n. and O. kawanabei Kobayashi & Sota sp.n. Here we provide a redescription and lectotype designation for O. laminifrons and descriptions of the three new species. These species showed different patterns of fungal host‐use among four Trametes and one Lenzites species. We also studied the phylogenetic relationships among these four species based on restriction‐site associated DNA (RAD) sequence data, which provided a more reliable phylogenetic tree. We discuss shifts in their fungal host use. Our results demonstrate that closely related, congeneric fungivorous insects exhibit different utility patterns for closely related fungal species, a phenomenon that has rarely been reported previously.