scholarly journals Maternal Dominance, Maternal Condition, and Offspring Sex Ratio in Ungulate Mammals

2004 ◽  
Vol 163 (1) ◽  
pp. 40-54 ◽  
Author(s):  
Ben C. Sheldon ◽  
Stuart A. West
Keyword(s):  
Sex Ratio ◽  
Maternal Condition ◽  
Offspring Sex Ratio ◽  
Offspring Sex

scholarly journals Maternal condition and previous reproduction interact to affect offspring sex in a wild mammal

2016 ◽  
Vol 12 (8) ◽  
pp. 20160510 ◽  
Author(s):  
Mathieu Douhard ◽  
Marco Festa-Bianchet ◽  
Fanie Pelletier
Keyword(s):  
Sex Ratio ◽  
Empirical Studies ◽  
Good Condition ◽  
Ovis Canadensis ◽  
Maternal Condition ◽  
Paternal Effects ◽  
Offspring Sex Ratio ◽  
Fitness Consequences ◽  
Offspring Sex ◽  
Dimorphic Species

Trivers and Willard proposed that offspring sex ratio should vary with maternal condition when condition, meant as maternal capacity to care, has different fitness consequences for sons and daughters. In polygynous and dimorphic species, mothers in good condition should preferentially produce sons, whereas mothers in poor condition should produce more daughters. Despite its logical appeal, support for this hypothesis has been inconsistent. Sex-ratio variation may be influenced by additional factors, such as environmental conditions and previous reproduction, which are often ignored in empirical studies. We analysed 39 years of data on bighorn sheep ( Ovis canadensis ) that fit all the assumptions of the Trivers–Willard hypothesis. Production of sons increased with maternal condition only for mothers that weaned a son the previous year. This relationship likely reflects a mother's ability to bear the higher reproductive costs of sons. The interaction between maternal condition and previous weaning success on the probability of producing a son was independent of the positive effect of paternal reproductive success. Maternal and paternal effects accounted for similar proportions of the variance in offspring sex. Maternal reproductive history should be considered in addition to current condition in studies of sex allocation.

scholarly journals Maternal Condition but Not Corticosterone Is Linked to Offspring Sex Ratio in a Passerine Bird

PLoS ONE ◽  
2014 ◽  
Vol 9 (10) ◽  
pp. e110858 ◽  
Author(s):  
Lindsay J. Henderson ◽  
Neil P. Evans ◽  
Britt J. Heidinger ◽  
Aileen Adams ◽  
Kathryn E. Arnold
Keyword(s):  
Sex Ratio ◽  
Passerine Bird ◽  
Maternal Condition ◽  
Offspring Sex Ratio ◽  
Offspring Sex

scholarly journals Experimental demonstration that offspring sex ratio varies with maternal condition

1999 ◽  
Vol 96 (2) ◽  
pp. 570-573 ◽  
Author(s):  
R. G. Nager ◽  
P. Monaghan ◽  
R. Griffiths ◽  
D. C. Houston ◽  
R. Dawson
Keyword(s):  
Sex Ratio ◽  
Experimental Demonstration ◽  
Maternal Condition ◽  
Offspring Sex Ratio ◽  
Offspring Sex

scholarly journals Maternal condition and offspring sex ratio in polygynous ungulates: a case study of bighorn sheep

2004 ◽  
Vol 16 (1) ◽  
pp. 274-279 ◽  
Author(s):  
Pierrick Blanchard ◽  
Marco Festa-Bianchet ◽  
Jean-Michel Gaillard ◽  
Jon T. Jorgenson
Keyword(s):  
Sex Ratio ◽  
Bighorn Sheep ◽  
Maternal Condition ◽  
Offspring Sex Ratio ◽  
Offspring Sex
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