Sex-biased survival predicts adult sex ratio variation in wild birds

Tamas Szekely, Andras Liker, Robert P. Freckleton, Claudia Fichtel, Peter M. Kappeler

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Adult sex ratio (ASR) is a central concept in population demography and breeding system evolution, and has implications for population viability and biodiversity conservation. ASR exhibits immense interspecific variation in wild populations, although the causes of this variation have remained elusive. Using phylogenetic analyses of 187 avian species from 59 families, we show that neither hatching sex ratios nor fledging sex ratios correlate with ASR. However, sex-biased adult mortality is a significant predictor of ASR, and this relationship is robust to 100 alternative phylogenetic hypotheses, and potential ecological and life-history confounds. A significant component of adult mortality bias is sexual selection acting on males, whereas increased reproductive output predicts higher mortality in females. These results provide the most comprehensive insights into ASR variation to date, and suggest that ASR is an outcome of selective processes operating differentially on adult males and females. Therefore, revealing the causes of ASR variation in wild populations is essential for understanding breeding systems and population dynamics.
LanguageEnglish
Article number20140342
JournalProceedings of the Royal Society B: Biological Sciences
Volume281
Issue number1788
DOIs
StatusPublished - 25 Jun 2014

Fingerprint

Population dynamics
Biodiversity
Sex Ratio
Birds
wild birds
sex ratio
Conservation
bird
gender
Population
wild population
Breeding
Mortality
mortality
reproductive strategy
demography and population
phylogenetics
Population Dynamics
interspecific variation
fledging

Cite this

Sex-biased survival predicts adult sex ratio variation in wild birds. / Szekely, Tamas; Liker, Andras; Freckleton, Robert P.; Fichtel, Claudia; Kappeler, Peter M.

In: Proceedings of the Royal Society B: Biological Sciences, Vol. 281, No. 1788, 20140342, 25.06.2014.

Research output: Contribution to journalArticle

Szekely, Tamas ; Liker, Andras ; Freckleton, Robert P. ; Fichtel, Claudia ; Kappeler, Peter M. / Sex-biased survival predicts adult sex ratio variation in wild birds. In: Proceedings of the Royal Society B: Biological Sciences. 2014 ; Vol. 281, No. 1788.
@article{96bd3b31bbc1410f90e8bb884dd8dbba,
title = "Sex-biased survival predicts adult sex ratio variation in wild birds",
abstract = "Adult sex ratio (ASR) is a central concept in population demography and breeding system evolution, and has implications for population viability and biodiversity conservation. ASR exhibits immense interspecific variation in wild populations, although the causes of this variation have remained elusive. Using phylogenetic analyses of 187 avian species from 59 families, we show that neither hatching sex ratios nor fledging sex ratios correlate with ASR. However, sex-biased adult mortality is a significant predictor of ASR, and this relationship is robust to 100 alternative phylogenetic hypotheses, and potential ecological and life-history confounds. A significant component of adult mortality bias is sexual selection acting on males, whereas increased reproductive output predicts higher mortality in females. These results provide the most comprehensive insights into ASR variation to date, and suggest that ASR is an outcome of selective processes operating differentially on adult males and females. Therefore, revealing the causes of ASR variation in wild populations is essential for understanding breeding systems and population dynamics.",
author = "Tamas Szekely and Andras Liker and Freckleton, {Robert P.} and Claudia Fichtel and Kappeler, {Peter M.}",
year = "2014",
month = "6",
day = "25",
doi = "10.1098/rspb.2014.0342",
language = "English",
volume = "281",
journal = "Proceedings of the Royal Society B: Biological Sciences",
issn = "0962-8452",
publisher = "The Royal Society",
number = "1788",

}

TY - JOUR

T1 - Sex-biased survival predicts adult sex ratio variation in wild birds

AU - Szekely, Tamas

AU - Liker, Andras

AU - Freckleton, Robert P.

AU - Fichtel, Claudia

AU - Kappeler, Peter M.

PY - 2014/6/25

Y1 - 2014/6/25

N2 - Adult sex ratio (ASR) is a central concept in population demography and breeding system evolution, and has implications for population viability and biodiversity conservation. ASR exhibits immense interspecific variation in wild populations, although the causes of this variation have remained elusive. Using phylogenetic analyses of 187 avian species from 59 families, we show that neither hatching sex ratios nor fledging sex ratios correlate with ASR. However, sex-biased adult mortality is a significant predictor of ASR, and this relationship is robust to 100 alternative phylogenetic hypotheses, and potential ecological and life-history confounds. A significant component of adult mortality bias is sexual selection acting on males, whereas increased reproductive output predicts higher mortality in females. These results provide the most comprehensive insights into ASR variation to date, and suggest that ASR is an outcome of selective processes operating differentially on adult males and females. Therefore, revealing the causes of ASR variation in wild populations is essential for understanding breeding systems and population dynamics.

AB - Adult sex ratio (ASR) is a central concept in population demography and breeding system evolution, and has implications for population viability and biodiversity conservation. ASR exhibits immense interspecific variation in wild populations, although the causes of this variation have remained elusive. Using phylogenetic analyses of 187 avian species from 59 families, we show that neither hatching sex ratios nor fledging sex ratios correlate with ASR. However, sex-biased adult mortality is a significant predictor of ASR, and this relationship is robust to 100 alternative phylogenetic hypotheses, and potential ecological and life-history confounds. A significant component of adult mortality bias is sexual selection acting on males, whereas increased reproductive output predicts higher mortality in females. These results provide the most comprehensive insights into ASR variation to date, and suggest that ASR is an outcome of selective processes operating differentially on adult males and females. Therefore, revealing the causes of ASR variation in wild populations is essential for understanding breeding systems and population dynamics.

UR - http://dx.doi.org/10.1098/rspb.2014.0342

U2 - 10.1098/rspb.2014.0342

DO - 10.1098/rspb.2014.0342

M3 - Article

VL - 281

JO - Proceedings of the Royal Society B: Biological Sciences

T2 - Proceedings of the Royal Society B: Biological Sciences

JF - Proceedings of the Royal Society B: Biological Sciences

SN - 0962-8452

IS - 1788

M1 - 20140342

ER -