Little evidence for negative effects of an invasive alien plant on pollinator services

This study focuses on the invasive Heracleum mantegazzianum and distance-dependent effects on pollination of Mimulus guttatus in abandoned grassland over 2 years

Charlotte Nielsen; Christine Heimes; Johannes Kollmann

2008

Scholarcy highlights

  • Many invasive alien plants occur in large populations with abundant flowers which are highly attractive to pollinators, and might affect pollination of co-occurring native species
  • This study focuses on the invasive Heracleum mantegazzianum and distance-dependent effects on pollination of Mimulus guttatus in abandoned grassland over 2 years
  • No distance effect was found for the number of bumblebees in traps, the invasive species attracted a diverse assemblage of insects, and visitation of M. guttatus was enhanced close to H. mantegazzianum
  • This positive effect was not reflected by seed set of M. guttatus, and heterospecific pollen decreased seed set in these plants
  • The functional role of the invader and suitable control strategies need further clarification, since removal of H. mantegazzianum may damage local pollinator populations

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