Discussion
Our results indicate that the hummingbird-mistletoe-marsupial mutualism has the potential to promote the complexity and stability of pollination and seed dispersal networks in the Patagonian temperate forest due the ecological importance of its members. Moreover, our results show that the disruption of this keystone interaction by non-native ungulates has cascading effects on the rest of the community by eroding pollination and seed dispersal networks in invaded sites.