DOI: 10.5061/dryad.gm7p3
title: Data from: Phylogenetic tree shape and the structure of mutualistic networks

description: Species community composition is known to alter the network of
 interactions between two trophic levels, potentially affecting its
 functioning (e.g. plant pollination success) and the stability of
 communities. Phylogenies vary in shape with regard to the rate of
 evolutionary change across a tree (influencing tree balance) and variation
 in the timing of branching events (affecting the distribution of node ages
 in trees), both of which may influence the structure of species
 interaction networks. Because related species are likely to share many of
 the traits that regulate interactions, the shape of phylogenetic trees may
 provide some insights into the distribution of traits within communities,
 and hence the likelihood of interaction among species. However, little
 attention has been paid to the potential effects of changes in
 phylogenetic diversity (PD) on interaction networks. Phylogenetic
 diversity is influenced by species diversity within a community, but also
 how distantly-related the constituent species are from one another. Here,
 we evaluate the relationship between two important measures of
 phylogenetic diversity (tree shape and age of nodes) and the structure of
 plant-pollinator interaction networks using empirical and simulated data.
 Whereas the former allows us to evaluate patterns in real communities, the
 latter allows us to evaluate more systematically the relationship between
 tree shape and network structure under three different models of trait
 evolution. In empirical networks, less balanced plant phylogenies were
 associated with lower connectance in interaction networks indicating that
 communities with the descendants of recent radiations are more diverged
 and specialized in their partnerships. In simulations, tree balance and
 the distribution of nodes through time were included in the best models
 for modularity, and the second best models for connectance and nestedness.
 In models assuming random evolutionary change through time (i.e., Brownian
 motion), less balanced trees and trees with nodes near the tips exhibited
 greater modularity, whereas in models with an early burst of radiation
 followed by relative stasis (i.e. early-burst models) more balanced trees
 and trees with nodes near roots had greater modularity. Synthesis:
 Overall, these results suggest that the shape of phylogenies can influence
 the structure of plant-pollinator interaction networks. However, the
 mismatch between simulations and empirical data indicate that no simple
 model of trait evolution mimics that observed in real communities.
description: Animal
 phylogeniesThis is a zip file of
 the animal phylogenies used in this study. The zip file includes some
 phylogenies not used in the study, but were considered for use. The zip
 file also contains a README.md file describing its
 contents.animal_trees.zipPlant phylogeniesThis is a zip file of the animal phylogenies used in this study. The zip file includes some phylogenies not used in the study, but were considered for use. The zip file also contains a README.md file describing its contents.plant_trees.zipNetwork filesThis is a zip file of the plant-animal networks used in this study. The zip file includes some networks not used in the study, but were considered for use. The zip file also contains a README.md file describing its contents.networks.zip