Understanding why some introduced species are more successful at establishing and spreading than others is a substantial challenge
for managing and conserving indigenous biodiversity.
Research by Laure Gallien and co-authors (including C·I·B Director Dave Richardson) sought to expand the current
understanding of the origins of species invasiveness over large evolutionary scales to better appreciate how migrations and evolution
have shaped the differences between invasive and non-invasive species. They exemplify the utility of this new approach by focussing on
one of the best-studied invasive plant genera: Pinus.
The central idea of their work is to study the long-term biogeography and evolutionary history of currently invasive and non-invasive
species. For instance, they show that currently invasive species belong to lineages that were particularly successful at colonizing new
regions in the past. This indicates that the ancestors of current invaders had also functional traits that had favoured long-distance
dispersal and establishment success, which are important components of current human mediated invasions.
“Although our results need to be repeated on other groups of species to prove general” says Laure, “they
provide a tantalizing new perspective on our understanding of species invasiveness! Elucidating historical events seems to be a key for
understanding the current and future composition of the world’s biota.”
For more information, contact Laure Gallien at email@example.com
Read the paper:
Gallien L., Saladin B., Boucher F.C., Richardson D.M.
& Zimmermann N.E. Does the legacy of historical biogeography shape current invasiveness in pines? New Phytologist.
Pinus contorta, a highly invasive species in Europe, South America and Oceania, seen here in its
native range in Yellowstone National Park, USA. (Photo credit: Laure Gallien)