DOI: 10.5061/dryad.9ghx3fff1
title: Baculum shape and paternity success in house mice: evidence for genital coevolution

description: Sexual selection is believed to be responsible for the rapid divergence of
 male genitalia, which is a widely observed phenomenon across different
 taxa. Among mammals, the stimulatory role of male genitalia and female
 ‘sensory perception’ has been suggested to explain these evolutionary
 patterns. Recent research on house mice has shown that baculum (penis
 bone) shape can respond to experimentally imposed sexual selection. Here,
 we explore the adaptive value of baculum shape by performing two
 experiments that examine the effects of male and female genitalia on male
 reproductive success. Thus, we selected house mice (Mus musculus
 domesticus) from families characterised by extremes in baculum shape
 (relative width) and examined paternity success in both non-competitive
 (monogamous) and competitive (polyandrous) contexts. Our analyses revealed
 that the relative baculum shape of competing males influenced competitive
 paternity success, but that this effect was dependent on the breeding
 value for baculum shape of the family from which females were derived. Our
 data provide novel insight into the potential role of sexual selected on
 the coevolution of the house mouse baculum and lend support to the
 stimulatory hypothesis for mammalian genital evolution.
description: Dataset 1-6: Landmarks were placed around the periphery of the
 baculum (36 sliding, 4 fixed) and relative warps (RWs) and centroid size
 were extracted. Landmark placement conducted using tpsDig 232 developed by
 Rohlf. Dataset 7-8: Methodology explained in detail in
 the paper.
description: Dataset 1: Landmark data from second-generation laboratory-reared
 house mice. Dataset 2: Landmark data from
 second-generation laboratory-reared house mice used for
 the <strong>monoandrous mating experiment</strong>. Specimen
 number (ID) can be matched with ID at the excel spreadsheet from
 Dataset 7. Dataset 3: Landmark data
 from second-generation laboratory-reared house mice used to conduct a
 repeatability analysis. For the same individual, we have two sets of
 landmarks. Used to assess the repeatability of landmark placement.
 Specimen numbers/ID can be matched with ID at the Dataset
 7 Dataset 4: Landmark data from
 third-generation laboratory-reared house mice.  Dataset
 5: Landmark data from third-generation laboratory-reared house mice used
 for the <strong>polyandrous mating
 experiment</strong>. Specimen number (ID) can be matched with ID at
 the excel spreadsheet from Dataset 8.
 Dataset 6: Landmark data from third-generation laboratory-reared
 house mice used to conduct a repeatability analysis. For the same
 individual, we have two sets of landmarks. Used to assess the
 repeatability of landmark placement. Specimen numbers/ID can be matched
 with ID at the Dataset 8. Dataset 7:
 Excel spreadsheet containing morphological data and identifiers of each
 individual for the second-generation laboratory reared house mice and
 <strong>monoandrous mating experiment</strong>. Dataset
 contains three different sheets representing data used for three different
 analysis. <em>Second-generation sheet</em>: data used to check
 if 2<sup>nd</sup> generation house mice aligned with the
 expected baculum shape extremes; <em>Monoandrous experiment
 data</em>: data used to conduct the statistical analysis on the
 monoandrous mating experiments; <em>Second-generation
 Repeatibility:</em> data used for the analysis of reliability of
 landmark placement and repeatability of our measurements.
 Dataset 8: Excel spreadsheet containing morphological data and
 identifiers of each individual for the third-generation laboratory reared
 house mice and <strong>polyandrous mating
 experiment</strong>. <em>Third-generation sheet</em>:
 data used to check if 3<sup>rd</sup> generation house mice
 aligned with the expected baculum shape extremes; <em>Polyandrous
 experiment data</em>: data used to conduct the statistical analysis
 on the polyandrous mating experiments; <em>Third-generation
 Repeatibility:</em> data used for the analysis of reliability of
 landmark placement and repeatability of our measurements.