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About half of all higher plant species are recognizable as evolutionarily recent polyploids, where multiple whole genomes or sets of chromosomes have come together from close ancestors. Additionally, over evolutionary time, all flowering plants have at least one polyploidy event, also known as a whole-genome duplication (WGD), in their ancestry, from before the divergence of […] More
Larcombe et al. present a 20-year assessment of reproductive isolation in a forest tree system. They show that intermediate inheritance of floral morphology results in the loss of strong mechanical barriers to zygote formation between Eucalyptus globulus and E. nitens – enabling F1 hybrids to act as a bridge for gene flow between the taxa. […] More
Hybrid zones that occur across environmental gradients provide excellent opportunities for studying the maintenance of divergent adaptations in the presence of gene flow. They also provide insight into the biodiversity implications of future species contact and hybridization in a changing world. In a new study published in AoB PLANTS, Brennan et al. used a quantitative […] More
In orchid species that have populations occurring in strongly contrasting habitats, mycorrhizal divergence and other habitat-specific adaptations may lead to the formation of reproductively isolated taxa and ultimately to species formation. In this study, Jacquemyn et al. used 454 amplicon pyrosequencing to investigate mycorrhizal communities associating with Epipactis helleborine in its typical forest habitat and […] More
Why some taxa are more species-rich than others still represents a major conundrum in biology. Ecological opportunities and evolutionary innovations are considered main factors that drive biodiversity, but are sometimes insufficient to explain current patterns of species richness. In their viewpoint article, Melzer and Theißen argue that developmental robustness might be an underappreciated factor promoting […] More
Characterizing ecological niches via Landolt indicator values of accompanying species, Sonnleitner et al. found that niches of four groups (two diploids, one tetraploid, one hexaploid) of Senecio carniolicus s.l. (Asteraceae) differed with respect to temperature, light and soil properties, but not in their breadths. More
In 1759, Linnaeus convinced his followers that plants could hybridize by crossing flowers in the daisy family and producing intermediate offspring. These hybrids, between Tragopogon pratensis and T. porrifolius, exist naturally today in London, UK, to all appearances the same. In a new study published in AoB PLANTS, Matthews et al. found that most of […] More
Evolutionary changes in reproductive compatibility is an important process contributing to the high levels of species diversity in Dendrobium. More
Examination of 1 nuclear and 4 plastid markers produces a phylogeny supporting the need to unite the taxons of two traditional genera, Myrcia and Marlierea. More
Increased dispersal ability in Brassiceae can influence macro-evolutionary processes, possibly by increasing the propensity for long-distance dispersal. More
The special issue on pollinator-driven speciation is available with free access now. We covered a few of the papers last year, but now they’re all free. One of the more puzzling papers is Novel adaptation to hawkmoth pollinators in Clarkia reduces efficiency, not attraction of diurnal visitors by Miller, Raguso and Kay. Why would a […] More
Results suggest that opposing individual-level/species-level selection pressures have driven evolution of pollinator-restrictive traits in bifid toadflaxes. More
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