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Multiple parallel dispersal events and mosaic genetic structure in Dactylorhiza

Orchids have minute seeds and can disperse over long distances. Hedrén et al. use genetic markers to track how the marsh orchid Dactylorhiza majalis ssp. lapponica (Orchidaceae) colonised the Baltic Sea island of Gotland repeatedly (and mostly from the east) after the last ice age.

Dactylorhiza majalis ssp. lapponica

These multiple colonization events have resulted in a mosaic pattern of genetic variation, such that adjacent populations are not necessarily closely related. Hedrénet al. also find that the genetically most diverse populations are located at older sites, suggesting that genetic diversity builds up over time.

Written by Alex Assiry

Alex Assiry is an editorial assistant in the Annals of Botany Office. When not working, Alex listens for the opportunity to help.

Aster amellus

Unmasking cryptic biodiversity in polyploids

Dimorphotheca pollen is deposited onto a fly Corsomyza as it probes a flower for nectar.

Male reproductive success and floral trait evolution in animal-pollinated plants