DOI: 10.5061/dryad.x0k6djhhv
title: Data from: Meiotic drive does not cause condition-dependent reduction of the sexual ornament in stalk-eyed flies

description: Meiotic drive systems are associated with low frequency chromosomal
 inversions. These are expected to accumulate deleterious mutations due to
 reduced recombination and low effective population size. We test this
 prediction using the “sex-ratio” (SR) meiotic drive system of the
 Malaysian stalk-eyed fly Teleopsis dalmanni.SR is
 associated with a large inversion (or inversions) on the X chromosome. In
 particular, we study eyespan in males carrying the SR chromosome, as this
 trait is a highly exaggerated, sexually dimorphic trait, known to have
 heightened condition-dependent expression. Larvae were raised in low and
 high larval food stress environments. SR males showed reduced eyespan
 under the low and high stress treatments but there was no evidence of a
 condition-dependent decrease in eyespan under high stress. Similar but
 more complex patterns were observed for female eyespan, with evidence of
 additivity under low stress and heterosis under high stress. These results
 do not support the hypothesis that reduced sexual ornament size in meiotic
 drive males is due to a condition-dependent response to the putative
 increase in mutation load. Instead, reduced eyespan likely reflects
 compensatory resource allocation to different traits in response to
 drive-mediated destruction of sperm.  
description: <strong>Experiment_1_data</strong>
 Raw data from the first experiment. Column A, "ID",
 refers to the unique identifier assigned to each fly. Column B,
 "Sex", refers to the sex of the fly, with F denoting females and
 M denoting males. Column C, "Cross", refers to the parental
 cross that generated the fly. Cross A was a cross between females
 heterozygous for SR meiotic drive and males hemizygous for SR drive. Cross
 B was a cross between females heterozygous for SR meiotic drive and
 wild-type, standard (ST) males. Column D, "Treatment", refers to
 the experimental treatment, either "High stress" or "Low
 stress". Column E, "Egg.date" refers to the date that the
 egg from which the fly larva hatched was collected and plated onto
 developmental "egg-lays", in the DD/MM/YYYY format. Column F,
 "Collection.date", refers to the date that the adult fly eclosed
 from its pupa and was collected for measurement, in the DD/MM/YYYY format.
 Column G, "Dev.time", refers to the total development time of
 the fly, in days. This is number of days between the "Egg.date"
 and the "Collection.date". Column H, "Measure.date",
 refers to the date the fly was measured, in the DD/MM/YYYY format. Column
 I, "Eyespan", refers to the eyespan of the adult fly, in
 millimetres, measured as the distance between the distal tips of the
 eyebulbs. Column J, "Thorax" refers to the length of the adult
 fly's thorax, in millimetres. It is measured from the anterior-most
 point of the prothorax to a point that that bisects where the posterior
 pair of legs attach to the thorax. Column K, "Genotype" refers
 to the genotype of the fly. SRSR denotes females homogygous for SR. SRX
 denotes females heterozygous for SR, XX denotes females homozygous for the
 standard ST X chromosome. SRY denotes SR drive males, and XY denotes
 standard males.  
 <strong>Experiment_2_data</strong>
 Raw data from the second experiment, where eggs from Cross A and
 Cross B were combined on egg lays prior to development. Column A,
 "Individual.ID", refers to the unique identifier assigned to
 each fly. Column B, "Cage.ID" refers to a unique identifer of
 the cage in which flies were allowed to develop and eclose. Column C,
 "Treatment" refers to the experimental treatment, either
 "Low stress" or "High stress." Column D,
 "Sex" refers to the sex of the fly, with F denoting females and
 M denoting males. Column E, "Eyespan", refers to the eyespan of
 the adult fly, in millimetres, measured as the distance between the distal
 tips of the eyebulbs. Column F, "Thorax" refers to the length of
 the adult fly's thorax, in millimetres. It is measured from the
 anterior-most point of the prothorax to a point that that bisects where
 the posterior pair of legs attach to the thorax.  Column G,
 "Egg.date" refers to the date that the egg from which the fly
 larva hatched was collected and plated onto developmental
 "egg-lays", in the DD/MM/YYYY format. Column H,
 "Measure.date", refers to the date the fly was measured, in the
 DD/MM/YYYY format. Column I, "Genotype" refers to the genotype
 of the fly. SRSR denotes females homogygous for SR. SRX denotes females
 heterozygous for SR, XX denotes females homozygous for the standard ST X
 chromosome. SRY denotes SR drive males, and XY denotes standard
 males.