Bee and tree species represented in the foraging and chemical networks.

N1 gives the number of trees of a particular species (top part of table) or number of bees of a particular species (bottom part of table) observed in the foraging network, N2 gives the number of tree individuals of a particular species (top part of table) or number of bee specimens of a particular species (bottom part of table) analyzed for the chemical networks and N3 gives the number of nests from which material was analyzed for a given bee species.