Admixture and environment shape population genetic and phytochemical variation across a conifer hybrid zone

Ancestry variation in hybrid zones can reflect the causes and genetic basis of reproductive isolation and result in novel phenotypic variation with the potential for extended ecological effects. Junipers (Juniperus) are foundational tree species in many semi-arid landscapes of western North America and often hybridize in zones of secondary contact. Such hybridization can be ecologically significant in foundational tree species, due to the strong genetic control and ecological consequences of plant chemistry. We generated genetic and phytochemical data to analyze hybridization among Juniperus grandis, J. occidentalis, and J. osteosperma in western Nevada and its impact on plant chemistry. We used population genomic data (9,125 SNPs; 326 individuals; 25 populations) to quantify patterns of genetic variation across populations and species and to characterize ancestry variation in hybrids. While populations within species showed little genetic differentiation, the parental species formed di...,
, , # Data from: Admixture and environment shape population genetic and phytochemical variation across a conifer hybrid zone

[https://doi.org/10.5061/dryad.0vt4b8h91](https://doi.org/10.5061/dryad.0vt4b8h91)

## Description of the data and file structure

This data set contains the genotype probabilities, environmental data, and phenotypic terpenoid data that was used in the analyses in Uckele et al., testing the relationships between geography, environment, and genetic variation across a natural juniper hybrid zone located in the western United States.

All files include a `sample_ID` column that uniquely identifies each individual sample. Each `sample_ID` follows this structured format:

* **Population ID**: A two-letter code (see Supplementary Table 1)
* **Separator**: An underscore (_)
* **Species ID**: A two-letter code, where:
* GR = Juniperus grandis
* HY = Hybrid
* OC = Juniperus occidentalis
* OS = Juniperus osteosperma
* **Separator**: An underscore (_)
* **Sample Number*...,

杂交带中的祖先成分变异可反映生殖隔离的成因与遗传基础，亦能催生全新的表型变异，进而产生潜在的长效生态影响。刺柏属（Juniperus）植物是北美西部诸多半干旱生境中的建群树种，且常于次生接触带发生杂交。由于植物化学性状受强烈的遗传调控且具有显著生态后果，这类杂交在建群树种中往往具备重要的生态学意义。本研究获取了遗传与植物化学数据，用以分析内华达州西部的大果刺柏（Juniperus grandis）、西美刺柏（Juniperus occidentalis）与犹他刺柏（Juniperus osteosperma）之间的杂交现象，及其对植物化学性状的影响。本研究利用群体基因组数据（9125个单核苷酸多态性位点[SNPs]、326个个体、25个种群），量化了不同种群与物种间的遗传变异模式，并解析了杂交个体的祖先成分变异。尽管物种内部的种群间遗传分化程度极低，但亲本物种形成了[原文此处截断]

数据集来源：《渐渗与环境塑造针叶树杂交带的群体遗传与植物化学变异》
https://doi.org/10.5061/dryad.0vt4b8h91

数据与文件结构说明
本数据集包含Uckele等人的研究中所使用的基因型概率数据、环境数据与表型萜类物质数据，该研究旨在解析美国西部天然刺柏杂交带内地理、环境与遗传变异之间的关联。

所有文件均包含用于唯一标识每个个体样本的`sample_ID`列，每个`sample_ID`遵循以下结构化格式：
* **种群编号**：两位字母代码（详见补充表1）
* **分隔符**：下划线（_）
* **物种编号**：两位字母代码，对应关系如下：
* GR：大果刺柏（Juniperus grandis）
* HY：杂交个体
* OC：西美刺柏（Juniperus occidentalis）
* OS：犹他刺柏（Juniperus osteosperma）
* **分隔符**：下划线（_）
* **样本序号*[原文此处截断]