The spread of Tansy in Minnesota

By Scout Nelson

Common tansy (Tanacetum vulgare), a rapidly spreading invasive plant in Minnesota, poses significant ecological and economic threats by displacing native plant species.

Understanding the dynamics of its spread is crucial for developing effective management strategies. A recent study, funded by the University’s Minnesota Invasive Terrestrial Plants and Pests Center and published in Molecular Ecology, sheds light on these dynamics using genomic sequencing from samples across the state.

The research team analyzed common tansy samples from 176 locations to determine the factors influencing its spread.

They discovered that land use plays a pivotal role, with the plant thriving in disturbed areas such as mines, roadways, and pastures. However, it struggles to establish in established prairie grasslands and row croplands, which has slowed its spread in southern and western Minnesota.

Lead author Ryan Briscoe Runquist, a senior research associate in the College of Biological Sciences, emphasized the importance of this finding. “Understanding what environmental factors drive invasive spread allows researchers and land managers to better plan for and deal with the threat of common tansy and other invasive species,” said Runquist.

The study also noted genetic divergence in recent populations in northwest Minnesota, suggesting possible adaptation that could accelerate future invasions.

This adaptation allows the species to colonize and establish more effectively, particularly in moderately to well-drained soils.

Despite the slowed invasion in areas with heavy row crop cultivation, Runquist warned that common tansy could continue to spread along disturbed roadcuts. He advises land managers to monitor these habitats closely to prevent further spread.

The research team plans to continue their work by studying common tansy's adaptation to various climates and environments across Minnesota. They aim to assess how different regional populations perform when transplanted statewide and identify plant traits that enhance survival and reproduction.

Future genomic studies will focus on areas of the genome linked to adaptation, further aiding in the development of targeted management practices for this invasive species.

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