Data from: Sexual signal loss in field crickets maintained despite strong sexual selection favoring singing males
Tanner, Jessie Caitlin
Published Apr 26, 2019 on Dryad.
Cite this dataset
Tanner, Jessie Caitlin; Swanger, Elizabeth; Zuk, Marlene (2019). Data from: Sexual signal loss in field crickets maintained despite strong sexual selection favoring singing males [Dataset]. Dryad. https://doi.org/10.5061/dryad.s53tm16
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.
F1 Phenotypes and Parental Genotypes
This 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.
This 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 2013-2016
This 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.
This file describes the contents of the three spreadsheets containing data published by Tanner, Swanger, and Zuk.