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The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos

P Morán, L. Labbé, Carlos Garcia De Leaniz Orcid Logo

Biology Letters, Volume: 12, Issue: 12, Start page: 20160693

Swansea University Author: Carlos Garcia De Leaniz Orcid Logo

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DOI (Published version): 10.1098/rsbl.2016.0693

Abstract

Juvenile sex ratios are often assumed to be equal for many species with genetic sex determination, but this has rarely been tested in fish embryos due to their small size and absence of sex-specific markers. We artificially crossed three populations of brown trout and used a recently developed genet...

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Published in: Biology Letters
ISSN: 1744-9561 1744-957X
Published: Royal Society 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa32924
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spelling 2020-07-15T12:53:42.8812482 v2 32924 2017-04-04 The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos 1c70acd0fd64edb0856b7cf34393ab02 0000-0003-1650-2729 Carlos Garcia De Leaniz Carlos Garcia De Leaniz true false 2017-04-04 SBI Juvenile sex ratios are often assumed to be equal for many species with genetic sex determination, but this has rarely been tested in fish embryos due to their small size and absence of sex-specific markers. We artificially crossed three populations of brown trout and used a recently developed genetic marker for sexing the offspring of both pure and hybrid crosses. Sex ratios (SR = proportion of males) varied widely one month after hatching ranging from 0.15 to 0.90 (mean = 0.39 ± 0.03). Families with high survival tended to produce balanced or male-biased sex ratios, but SR was significantly female-biased when survival was low, suggesting that males sustain higher mortality during development. No difference in SR was found between pure and hybrid families, but the existence of sire × dam interactions suggests that genetic incompatibility may play a role in determining sex ratios. Our findings have implications for animal breeding and conservation because skewed sex ratios will tend to reduce effective population size and bias selection estimates. Journal Article Biology Letters 12 12 20160693 Royal Society 1744-9561 1744-957X embryo development, sex-specific mortality, sex ratio, genetic incompatibility, genetic conflict, sex determination 31 12 2016 2016-12-31 10.1098/rsbl.2016.0693 First joint author and corresponding author COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University FP7 AQUAEXCEL 0114/08/01/10, 262336 2020-07-15T12:53:42.8812482 2017-04-04T06:08:18.6433246 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences P Morán 1 L. Labbé 2 Carlos Garcia De Leaniz 0000-0003-1650-2729 3 0032924-08052017092914.pdf 20160693.full.pdf 2017-05-08T09:29:14.7100000 Output 473837 application/pdf Version of Record true 2016-12-07T00:00:00.0000000 Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. true eng
title The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
spellingShingle The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
Carlos Garcia De Leaniz
title_short The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
title_full The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
title_fullStr The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
title_full_unstemmed The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
title_sort The male handicap: male-biased mortality explains skewed sex ratios in brown trout embryos
author_id_str_mv 1c70acd0fd64edb0856b7cf34393ab02
author_id_fullname_str_mv 1c70acd0fd64edb0856b7cf34393ab02_***_Carlos Garcia De Leaniz
author Carlos Garcia De Leaniz
author2 P Morán
L. Labbé
Carlos Garcia De Leaniz
format Journal article
container_title Biology Letters
container_volume 12
container_issue 12
container_start_page 20160693
publishDate 2016
institution Swansea University
issn 1744-9561
1744-957X
doi_str_mv 10.1098/rsbl.2016.0693
publisher Royal Society
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Juvenile sex ratios are often assumed to be equal for many species with genetic sex determination, but this has rarely been tested in fish embryos due to their small size and absence of sex-specific markers. We artificially crossed three populations of brown trout and used a recently developed genetic marker for sexing the offspring of both pure and hybrid crosses. Sex ratios (SR = proportion of males) varied widely one month after hatching ranging from 0.15 to 0.90 (mean = 0.39 ± 0.03). Families with high survival tended to produce balanced or male-biased sex ratios, but SR was significantly female-biased when survival was low, suggesting that males sustain higher mortality during development. No difference in SR was found between pure and hybrid families, but the existence of sire × dam interactions suggests that genetic incompatibility may play a role in determining sex ratios. Our findings have implications for animal breeding and conservation because skewed sex ratios will tend to reduce effective population size and bias selection estimates.
published_date 2016-12-31T03:40:30Z
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