DOI: 10.5061/dryad.s53tm16
title: Data from: Sexual signal loss in field crickets maintained despite strong sexual selection favoring singing males

description: Evolutionary biologists commonly seek explanations for how selection
 drives the emergence of novel traits. While trait loss is also predicted
 to occur frequently, few contemporary examples exist. In Hawaii, the
 Pacific field cricket (Teleogryllus oceanicus) is undergoing adaptive
 sexual signal loss due to natural selection imposed by eavesdropping
 parasitoids. Mutant male crickets (“flatwings”) cannot sing. We measured
 the intensity of sexual selection on wing phenotype in a wild population.
 First, we surveyed the relative abundance of flatwings and “normal-wings”
 (non-mutants) on Oahu. Then, we bred wild-mated females’ offspring to
 determine both female genotype with respect to the flatwing mutation and
 the proportion of flatwing males that sired their offspring. We found
 evidence of strong sexual selection favoring the production of song:
 females were predominantly homozygous normal-wing; their offspring were
 sired disproportionately by singing males; and at the population level,
 flatwing males became less common following a single sexual selection
 event. We report a selection coefficient describing the total (pre- and
 postcopulatory) sexual selection favoring normal-wing males in nature.
 Given the maintenance of the flatwing phenotype in Hawaii in recent years,
 this substantial sexual selection additionally suggests an approximate
 strength of opposing natural selection that favors silent males.
description: F1 Phenotypes and
 Parental GenotypesThis file contains the
 phenotypes of the F1 descendants of wild-captured (and wild-mated)
 parental females from Oahu. Parental females are identified with unique
 3-digit numbers. Columns contain count data describing the total number of
 their male offspring (sons), the number of normal-wing (NW) sons, flatwing
 (FW) sons, and daughters. The final column contains the genotype of the
 parental female, if sufficient data existed to infer the parental female’s
 genotype. We considered a female to be heterozygous if she produced at
 least one normal-wing and one flatwing son (heterozygous females are coded
 as “hetero”). We considered a female homozygous only if she produced at
 least 5 adult sons and all were the same phenotype (homozygous normal-wing
 was coded “homoNW”; homozygous flatwing was coded “homoFW”). If neither of
 these conditions were met, we left the “Genotype” blank for that
 female.F2
 phenotypesThis file contains raw
 phenotype data for the second filial (F2) generation. Each row is a single
 observation of an individual full-sib family. In the first column, the
 family is coded using the number of the parental female from which it is
 descended and a number identifying its F1 mother. For example, the family
 number “213.F2.3” identifies the full-sib family of F2 crickets whose
 mother was F1 female #3 descended from parental female #213. Columns
 contain count data that describe the number of normal-wing males
 (NWMales), flatwing males (FWMales) and females at each observation.
 Because the crickets matured at different rates and were phenotyped upon
 reaching adulthood, we made multiple observations of some families. Count
 data were therefore aggregated across entries for the same full-sib family
 prior to analysis.Field Survey Data - Oahu
 2013-2016This file contains data
 from field surveys of Teleogryllus oceanicus phenotypes; each row is a
 different observation. See the publication for details of how observations
 were made. Columns contain count data describing the number of females,
 flatwing males, and normal-wing males found in each plot, as well as the
 total number of males and the total number of crickets.READMEThis file describes the
 contents of the three spreadsheets containing data published by Tanner,
 Swanger, and Zuk.