Species delimitation of Planosiphon gracilis morphospecies (Scytosiphonaceae, Phaeophyceae) from Japan and the description of Pl. nakamurae sp. nov.
Species delimitation of Planosiphon gracilis morphospecies (Scytosiphonaceae, Phaeophyceae) from Japan and the description of Pl. nakamurae sp. nov.
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日本Planosiphon gracilis 形态种（Scytosiphonaceae、Phaeophyceae）的物种界定和Pl 的描述。
DOI：
10.1080/00318884.2019.1709144
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发表时间：
2020
期刊：
影响因子：
1.6
通讯作者：
Kogame Kazuhiro
中科院分区：
文献类型：
--
作者：
Hoshino Masakazu;Croce Maria Emilia;Hanyuda Takeaki;Kogame Kazuhiro
线粒体cox1和cox3和叶绿体rbcL基因序列的基础上的分子系统发育分析表明，形态种的棕色Planosiphongracilis（Scytosiphonaceae，Ectocarpales）从日本是一个复杂的三个不同的谱系（谱系I-III）。来自这些谱系的标本具有Pl的典型形态。gracilis（即扁平、线形、中空和群居的直立叶状体）;因此，在许多情况下，它们之间的形态区分是困难的。我们观察到三个谱系之间存在巨大的遗传差异（c。cox 1和cox 3中的10%）。此外，我们观察到一个生殖隔离的障碍之间的谱系I和II，尽管在其地理分布的广泛重叠。因此，我们的数据表明，这三个谱系是不同的物种。由于谱系I包括Pl. gracilis，这一谱系归因于Pl。股薄肌谱系III在系统发育上与Pl接近。来自加拿大的complanatus，cox1的分歧为4.1%。对于谱系II，一个新的种名，Pl。nakamurae sp. nov.，被求婚了在阿根廷也发现了这种新物种。
Molecular phylogenetic analyses based on mitochondrial cox1 and cox3 and chloroplast rbcL gene sequences revealed that the morphospecies of the brown alga Planosiphon gracilis (Scytosiphonaceae, Ectocarpales) from Japan is a complex of three distinct lineages (lineages I–III). Specimens from these lineages had the typical morphology of Pl. gracilis (i.e. flattened, linear, hollow, and gregarious erect thalli); thus, morphological discrimination among them was difficult in many cases. We observed large genetic divergences among the three lineages (c. 10% in cox1 and cox3). Moreover, we observed a reproductive isolating barrier between lineages I and II, despite the wide overlap in their geographic distribution. Our data, therefore, suggest that these three lineages are distinct species. Since lineage I included the holotype specimen of Pl. gracilis, this lineage was attributed to Pl. gracilis. Lineage III was phylogenetically close to Pl. complanatus from Canada with a 4.1% divergence in cox1. For lineage II, a new species name, Pl. nakamurae sp. nov., was proposed. This new species was also found in Argentina.