Lineage-specific phylogenetic structure of boreal habitats suggests different assembly processes across phylogenetic and spatial scales

The phylogenetic distance among species in a community (community phylogenetic structure) has been used to infer deterministic and stochastic assembly processes, albeit with criticisms. The effect of phylogenetic scale (old versus young lineages) and spatial scale on measures of community phylogenetic structure are rarely tested simultaneously especially in the boreal biome, yet are essential to unravel different assembly processes that might operate in a community. We examined lineage-specific phylogenetic structure for six vascular plant communities defined at the habitat scale (arctic-alpine barren, bog, fen, kalmia barren, limestone barren, and serpentine barren) on the island of Newfoundland, Canada, and the phylogenetic structure of plant communities defined at a plot scale (72 plots x 1m2). Contrary to the expectation under the stress-dominance hypothesis of phylogenetic clustering in challenging boreal environments, the majority of clades across the six boreal habitats had rando..., , # Lineage-specific phylogenetic structure of boreal habitats suggests different assembly processes across phylogenetic and spatial scales

This repository contains the supplementary data, R scripts, and supporting information associated with the manuscript. The materials provide additional details on the study system, methods, datasets, and results. The study examined lineage-specific community phylogenetic structure of vascular plant communities across six boreal habitats in Newfoundland, Canada, and at fine-scale vegetation plots.

## 1. Data files

### Environmental_variables.xls

Environmental variables for 72 permanent 1 m² vegetation plots (coordinates, elevation, slope, geology, distances to water, wetland/rock/soil percentages, ecosubregion).

| Variable | Definition | Units/Values | Interpretation Key |
| :--------------- | :--------------------------------------...,