Genomewide variation provides insight into evolutionary relationships in a monkeyflower species complex (Mimulus...

Area of Science:

• Evolutionary biology
• Genomics
• Plant sciences

Background:

• Evolutionary radiations offer insights into biodiversity origins.
• Rapid divergence and gene flow complicate phylogenetic inference.
• Monkeyflowers (Mimulus section Diplacus) present a complex radiation with taxonomic challenges.

Purpose of the Study:

• To clarify evolutionary relationships within Mimulus section Diplacus.
• To integrate morphological and genomic data for phylogenetic reconstruction.
• To investigate the role of hybridization and phenotypic evolution in this radiation.

Main Methods:

• Genomewide single nucleotide polymorphism (SNP) data.
• Phylogenetic and population genomic analyses.
• Hybridization tests and multivariate floral trait analyses.

Main Results:

• Identification of four primary clades with shared variation.
• Evidence of recent gene flow between closely related groups.
• Significant discordance between molecular and floral trait data, indicating convergent/divergent evolution.

Conclusions:

• Mimulus section Diplacus exhibits characteristics of a rapid radiation.
• Findings necessitate a revision of the taxonomy for Mimulus section Diplacus.
• The study provides a foundation for future evolutionary research in this group.