Peripheral budding following range expansion explains diversity and distribution of one‐sided Livebearing fish

Peripheral budding occurs when populations diverge from a widespread parental population and speciate along its periphery, facilitated by the interaction of ecological and geographic barriers. This phenomenon results in species that contrast in range size and ecological tolerance and can lead to confounding phylogenies. Here we examine patterns of peripheral budding in the Jenynsia lineata species complex using a genomic approach via RAD sequences. The J. lineata species complex is a group of live‐bearing fish in South America that shows signals of peripheral budding through asymmetric range sizes, J. lineata being widespread, and with a confounding and unresolved phylogeny. Our goal was to adequately classify the J. lineata species complex, delimit species within the complex via multiple approaches, and identify signals of introgression to better understand the underlying evolutionary patterns. We collected 85 samples from the species complex for DNA extraction and performed RAD sequen..., , # Peripheral budding following range expansion explains diversity and distribution of one‐sided livebearing fish

Dataset DOI: [10.5061/dryad.3ffbg79xg](10.5061/dryad.3ffbg79xg)

## Description of the data and file structure

Caudal fin tissues were collected from one-sided live bearer fish (*Jenynsia sp.*) in Argentina, Uruguay, and Brazil between 2013 and 2017. Tissues were preserved in 100% ethanol. DNA was extracted via a double-digest restriction-associated DNA (ddRAD-seq) protocol. All raw genomic sequences (fastq files) are available  in the NCBI sequence read archive (SRA) (BioProject: PRJNA822935 [Accession: SRX14732231–SRX14732245; SRX14732201–SRX14732206; SRX14732208–SRX14732216; SRX14732189–SRX14732191] and BioProject: PRJNA1238845 [Accession: SAMN47485203–SAMN47485265]). An 83 individuals dataset and 94 individuals dataset was used in these analyses. The 83 individuals dataset includes sample sequences from all species of the *Jenynsia lineata* species complex (*onca, luxat...,

边缘成种（peripheral budding）指种群从广布的祖先种群中分化，并沿其边缘发生物种形成，该过程由生态屏障与地理屏障的协同作用推动。此现象会形成分布范围大小与生态耐受度显著分化的物种，还可能导致系统发育关系混淆不清。本研究通过RAD序列（RAD sequences）的基因组学方法，对侧带花鳉（Jenynsia lineata）物种复合体的边缘成种模式展开分析。侧带花鳉物种复合体是一类分布于南美洲的胎生鱼类，其分布范围大小呈不对称特征（广布种为侧带花鳉本身），且系统发育关系混淆且尚未厘清，这显示出边缘成种的信号。本研究的目标在于对侧带花鳉物种复合体进行合理分类，通过多种方法界定该复合体内部的物种，并识别渐渗（introgression）信号，以更好地理解其背后的演化模式。研究人员从该物种复合体中采集了85份样本用于DNA提取，并开展了RAD测序……
# 范围扩张后的边缘成种阐释单侧胎生鱼类的多样性与分布格局
数据集DOI：10.5061/dryad.3ffbg79xg
## 数据与文件结构说明
2013年至2017年间，研究人员从阿根廷、乌拉圭与巴西采集单侧胎生鱼类（*Jenynsia* sp.）的尾鳍组织样本。采集的组织保存于100%乙醇中。采用双酶切限制性位点相关DNA测序（double-digest restriction-associated DNA sequencing, ddRAD-seq）方案提取基因组DNA。所有原始基因组序列（fastq格式文件）均可在NCBI序列读取档案库（SRA）中获取，对应生物项目编号为PRJNA822935（登录号：SRX14732231–SRX14732245、SRX14732201–SRX14732206、SRX14732208–SRX14732216、SRX14732189–SRX14732191）与PRJNA1238845（登录号：SAMN47485203–SAMN47485265）。本分析使用了两套数据集，分别包含83个个体与94个个体的序列数据。包含83个个体的数据集涵盖侧带花鳉物种复合体所有物种的样本序列（onca、luxat……）