Data from: Plant interactions shape pollination networks via nonadditive effects

Plants grow in communities where they interact with other plants and with
other living organisms such as pollinators. On the one hand, studies of
plant–plant interactions rarely consider how plants interact with other
trophic levels such as pollinators. On the other, studies of plant–animal
interactions rarely deal with interactions within trophic levels such as
plant–plant competition and facilitation. Thus, to what degree plant
interactions affect biodiversity and ecological networks across trophic
levels is poorly understood. We manipulated plant communities driven by
foundation species facilitation and sampled plant–pollinator networks at
fine spatial scale in a field experiment in Sierra Nevada, Spain. We found
that plant–plant facilitation shaped pollinator diversity and structured
pollination networks. Nonadditive effects of plant interactions on
pollinator diversity and interaction diversity were synergistic in one
foundation species networks while they were additive in another foundation
species. Nonadditive effects of plant interactions were due to rewiring of
pollination interactions. In addition, plant facilitation had negative
effects on the structure of pollination networks likely due to increase in
plant competition for pollination. Our results empirically demonstrate how
different network types are coupled, revealing pervasive consequences of
interaction chains in diverse communities.