Blomberg's K and Pagel's lambda (Asteraceae)

Knowledge graph centered on Blomberg's K and Pagel's lambda (Asteraceae) with 29 nodes and 105 connections. Top connected: Asteraceae, Rushes, Bacteria, Erigeron, elevational gradients.

Method synopsis

Statistical testing for phylogenetic signal in species traits using Blomberg's K and Pagel's lambda to determine whether closely related species have more similar trait values than expected by chance.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Rare species do not disproportionately contribute to phylogenetic diversity in a subalpine plant community (2025), American Journal of Botany. Implementations in other papers (listed below) may differ.

1. Test phylogenetic signal
   Calculate Blomberg's K and Pagel's λ for both abundance and range size traits using R packages picante and phytools. Use 5000 randomizations for Blomberg's K and 5000 iterations for Pagel's λ with lambda values near 1 indicating trait evolution consistent with Brownian motion.
   Quantities: Two phylogenetic signal metrics for two traits (abundance and range size)Duration: One-time calculation for phylogenetic signal testingConditions: Tested against null expectation of no phylogenetic signal
   Equipment: R software, picante package, phytools package

Typical Equipment

• R software
• picante package
• phytools package

Output Measurements

• Blomberg's K statistic
• Pagel's lambda
• P-values

Papers Using This Protocol (1)

Species Studied With This Protocol