10.5061/DRYAD.10NK0
Lüpold, Stefan
University of Zurich
Jin, Long
China West Normal University
Liao, Wen Bo
China West Normal University
Data from: Population density and structure drive differential investment
in pre- and postmating sexual traits in frogs
Dryad
dataset
2017
trade-offs
Amplexus
reproductive investment
Male weaponry
Forelimb muscles
Selection - Sexual
Testes
2017-03-27T14:23:51Z
2017-03-27T14:23:51Z
en
https://doi.org/10.1111/evo.13246
34742 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Sexual selection theory predicts a trade-off between premating (ornaments
and armaments) and postmating (testes and ejaculates) sexual traits,
assuming that growing and maintaining these traits is costly and that
total reproductive investments are limited. The number of males in
competition, the reproductive gains from investing in premating sexual
traits, and the level of sperm competition are all predicted to influence
how males allocate their finite resources to these traits. Yet, empirical
examination of these predictions is currently scarce. Here, we studied
relative expenditure on pre- and postmating sexual traits among frog
species varying in their population density, operational sex ratio and the
number of competing males for each clutch of eggs. We found that the
intensifying struggle to monopolize fertilizations as more and more males
clasp the same female to fertilize her eggs shifts male reproductive
investment toward sperm production and away from male weaponry. This
shift, which is mediated by population density and the associated level of
male–male competition, likely also explains the trade-off between pre- and
postmating sexual traits in our much broader sample of anuran species. Our
results highlight the power of such a multi-level approach in resolving
the evolution of traits and allocation trade-offs.
Estimates of population density and operational sex ratioIndividual
estimates of population density (individuals/m2) and operational sex ratio
(proportion of males among all individuals) for each of our 10 focal
species. The date indicates the first of three consecutive days of data
collection for each estimate.PopulationDensity_and_OSR.txtGenbank
accession numbersGenbank accession numbers for the gene sequences used to
generate the phylogenyAccessionNumbers.txtSpecies-specific
dataSpecies-specific data of all 30 species, including morphological data,
mating system (monandry, polyandry), temporal breeding pattern (explosive
breeder, prolonged breeder), oviposition site (aquatic,
terrestrial/arboreal), and male competition and female choice (yes,
no).SpeciesSpecificData.txtPhylogenyPhylogeny with branch lengths of the
30 anuran species used.phylogeny.nexMorphological data of individual males
of 10 focal speciesMorphological data (body mass, testes mass, forelimb
muscle mass) of all males males used to calculate intra-specific
allometries.IndividualMorphologicalData.txt
South-east Asia