Two invasive acacias successfully established mutualistic interactions with local pollinator species.
Acacia visitors were predominantly generalist pollinators.
The number of pollinator visits to acacia was high, but pollination rates were low due to high acacia flower abundance.
Competition for pollinators was low, since only two native plant species were starting their flowering period.
Native plant species with synchronous phenology presented similar or higher pollination rates than acacias.