10.5061/DRYAD.28KD1
Field, David Luke
University of Toronto
Pickup, Melinda
University of Toronto
Barrett, Spencer C. H.
University of Toronto
Data from: Comparative analyses of sex-ratio variation in dioecious
flowering plants
Dryad
dataset
2012
Mating Systems
2012-10-25T17:32:31Z
2012-10-25T17:32:31Z
en
https://doi.org/10.1111/evo.12001
2279235 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Dioecious plant species commonly exhibit deviations from the equilibrium
expectation of 1:1 sex ratio, but the mechanisms governing this variation
are poorly understood. Here, we use comparative analyses of 243 species,
representing 123 genera and 61 families to investigate ecological and
genetic correlates of variation in the operational (flowering) sex ratio.
After controlling for phylogenetic non-independence, we examined the
influence of growth form, clonality, fleshy fruits, pollen and seed
dispersal vector, and the possession of sex chromosomes on sex-ratio
variation. Male-biased flowering sex ratios were twice as common as
female-biased ratios. Male bias was associated with long-lived growth
forms (e.g. trees) and biotic seed dispersal and fleshy fruits, whereas
female bias was associated with clonality, especially for herbaceous
species, and abiotic pollen dispersal. Female bias occurred in species
with sex chromosomes and there was some evidence for a greater degree of
bias in those with heteromorphic sex chromosomes. Although the role of
interactions among these correlates require further study, our results
indicate that sex-based differences in costs of reproduction, pollen and
seed dispersal mechanisms and sex chromosomes can each play important
roles in affecting flowering sex ratios in dioecious plants.
SexRatioFINAL_GLMApril2012Life history traits and sex ratio data used in
the GEE phylogenetic comparative analysis and
GLM.Phylo6_247_April2012Original nexus file containing the phylogenetic
data. This is not the final data analysed as it contains an additional 4
species removed prior to analysis due to failing quality criteria (see
manuscript). Moreover, this is the base tree from which 200 further trees
were created (see next file).200treesNoiseBL&PolyResolvActually
phylogenies used in the final GEE analyses. 200 tree were generated using
Mesquite to randomly resolve polytomies and to add noise to branch
lengths.