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Climate effects on offspring sex ratio in a viviparous lizard

Wapstra, Erik; Uller, Tobias LU ; Sinn, David; Olsson, Mats; Joss, Jean and Shine, Richard (2009) In Journal of Animal Ecology 78(1). p.84-90
Abstract
Understanding individual and population responses to climate change is emerging as an important challenge. Because many phenotypic traits are sensitive to environmental conditions, directional climate change could significantly alter trait distribution within populations and may generate an evolutionary response.



In species with environment-dependent sex determination, climate change may lead to skewed sex ratios at hatching or birth. However, there are virtually no empirical data on the putative link between climatic parameters and sex ratios from natural populations.



We monitored a natural population of viviparous lizards with temperature-dependent sex determination (Niveoscincus ocellatus) over... (More)
Understanding individual and population responses to climate change is emerging as an important challenge. Because many phenotypic traits are sensitive to environmental conditions, directional climate change could significantly alter trait distribution within populations and may generate an evolutionary response.



In species with environment-dependent sex determination, climate change may lead to skewed sex ratios at hatching or birth. However, there are virtually no empirical data on the putative link between climatic parameters and sex ratios from natural populations.



We monitored a natural population of viviparous lizards with temperature-dependent sex determination (Niveoscincus ocellatus) over seven field seasons. Sex ratios at birth fluctuated significantly among years and closely tracked thermal conditions in the field, with the proportion of male offspring increasing in colder years.



This is the first study to demonstrate the effect of local climatic conditions (e.g. temperature) on offspring sex ratio fluctuations in a free-living population of a viviparous ectotherm. A succession of warmer-than-usual years (as predicted under many climate-change scenarios) likely would generate female-biased sex ratios at birth, while an increase in interannual variation (as also predicted under climate change scenarios) could lead to significant fluctuations in cohort sex ratios. If cohort sex ratio bias at birth leads to adult sex ratio bias, long-term directional changes in thermal conditions may have important effects on population dynamics in this species. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Animal Ecology
volume
78
issue
1
pages
84 - 90
publisher
Federation of European Neuroscience Societies and Blackwell Publishing Ltd
external identifiers
  • scopus:57549095789
ISSN
1365-2656
DOI
10.1111/j.1365-2656.2008.01470.x
language
English
LU publication?
no
id
f9743c43-a8d9-4953-9df9-68472198ba10 (old id 4739187)
date added to LUP
2014-11-07 10:02:01
date last changed
2017-10-01 03:51:06
@article{f9743c43-a8d9-4953-9df9-68472198ba10,
  abstract     = {Understanding individual and population responses to climate change is emerging as an important challenge. Because many phenotypic traits are sensitive to environmental conditions, directional climate change could significantly alter trait distribution within populations and may generate an evolutionary response. <br/><br>
<br/><br>
In species with environment-dependent sex determination, climate change may lead to skewed sex ratios at hatching or birth. However, there are virtually no empirical data on the putative link between climatic parameters and sex ratios from natural populations. <br/><br>
<br/><br>
We monitored a natural population of viviparous lizards with temperature-dependent sex determination (Niveoscincus ocellatus) over seven field seasons. Sex ratios at birth fluctuated significantly among years and closely tracked thermal conditions in the field, with the proportion of male offspring increasing in colder years. <br/><br>
<br/><br>
This is the first study to demonstrate the effect of local climatic conditions (e.g. temperature) on offspring sex ratio fluctuations in a free-living population of a viviparous ectotherm. A succession of warmer-than-usual years (as predicted under many climate-change scenarios) likely would generate female-biased sex ratios at birth, while an increase in interannual variation (as also predicted under climate change scenarios) could lead to significant fluctuations in cohort sex ratios. If cohort sex ratio bias at birth leads to adult sex ratio bias, long-term directional changes in thermal conditions may have important effects on population dynamics in this species.},
  author       = {Wapstra, Erik and Uller, Tobias and Sinn, David and Olsson, Mats and Joss, Jean and Shine, Richard},
  issn         = {1365-2656},
  language     = {eng},
  number       = {1},
  pages        = {84--90},
  publisher    = {Federation of European Neuroscience Societies and Blackwell Publishing Ltd},
  series       = {Journal of Animal Ecology},
  title        = {Climate effects on offspring sex ratio in a viviparous lizard},
  url          = {http://dx.doi.org/10.1111/j.1365-2656.2008.01470.x},
  volume       = {78},
  year         = {2009},
}