DOI: 10.5061/dryad.bp0gv
title: Data from: Sex differences in the effects of juvenile and adult diet on age-dependent reproductive effort

description: Sexual selection should cause sex differences in patterns of resource
 allocation. When current and future reproductive effort trade-off,
 variation in resource acquisition might further cause sex differences in
 age-dependent investment, or in sensitivity to changes in resource
 availability over time. However, the nature and prevalence of sex
 differences in age-dependent investment remain unclear. We manipulated
 resource acquisition at juvenile and adult stages in decorated crickets,
 Gryllodes sigillatus, and assessed effects on sex-specific allocation to
 age-dependent reproductive effort (calling in males, fecundity in females)
 and longevity. We predicted that the resource and time demands of egg
 production would result in relatively consistent female strategies across
 treatments, while male investment should depend sharply on diet. Contrary
 to expectations, female age-dependent reproductive effort diverged
 substantially across treatments, with resource-limited females showing
 much lower and later investment in reproduction; the highest fecundity was
 associated with intermediate lifespans. In contrast, long-lived males
 always signalled more than short-lived males, and male age-dependent
 reproductive effort did not depend on diet. We found consistently positive
 covariance between male reproductive effort and lifespan, while diet
 altered this covariance in females, revealing sex differences in the
 benefits of allocation to longevity. Our results support sex-specific
 selection on allocation patterns, but also suggest a simpler alternative:
 males may use social feedback to make allocation decisions, and
 preferentially store resources as energetic reserves in its absence.
 Increased calling effort with age therefore could be caused by gradual
 resource accumulation, heightened mortality risk over time, and a lack of
 feedback from available mates.
description: Individual treatment,
 morphology and lifespanData show individual ID,
 treatment groups and sex for each experimental subject surviving to
 eclosion. DevRate = (1/days from hatching to eclosion). Weight is measured
 in grams. Pronotum length is measured in millimetres. SMI is calculated
 separately for males and females. PostEclosion is the number of days an
 individual survived post-eclosion.sexdiffs_main.csvCalling effortIndividual calling measurements (long format). Duration is calling effort measurement, and the time of measurement is given in time (weeks), msmt.age (days), and age.std (mean-centred and scaled days). Term denotes whether it was the final measurement taken before death; PostEclosion is number of days the individual survived after eclosion (PE.std is mean-centred and scaled)sexdiffs_call.csvFecundityIndividual female fecundity (long format). EggCount gives a single measurement of weekly fecundity, with measurement time given as time (weeks from eclosion), msmt.age (days from eclosion), age.std (days mean-centred and scaled). PostEclosion is the number of days after eclosion that an individual survived, and PE.std is this mean-centred and scaled.sexdiffs_eggs.csv