Natural resource managers have learned from experience with invasive weeds like melaleuca and hydrilla that exotic plants can threaten the integrity of whole native ecosystems.
(Natural resource managers; have learned; from experience with invasive weeds like melaleuca and hydrilla) (exotic plants; can threaten; the integrity of whole native ecosystems)
Natural resource managers exotic plants
have learned can threaten
from experience with invasive weeds like melaleuca and hydrilla
the integrity of whole native ecosystems