Influence of Cohort Age and Host Age on Oviposition Activity and Offspring Sex Ratio of Biosteres tryoni (Hymenoptera: Braconidae), a Larval Parasitoid of Ceratitis capitata (Diptera: Tephritidae)

1990 ◽  
Vol 83 (3) ◽  
pp. 779-783 ◽  
Author(s):  
T. T. Y. Wong ◽  
M. M. Ramadan ◽  
D. O. McInnis ◽  
N. Mochizuki
Keyword(s):  
Sex Ratio ◽  
Ceratitis Capitata ◽  
Host Age ◽  
Offspring Sex Ratio ◽  
Larval Parasitoid ◽  
Offspring Sex ◽  
Biosteres Tryoni

Offspring sex ratio in moose Alces alces in relation to paternal age: an experiment

2004 ◽  
Vol 10 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Bernt-Erik Sæther ◽  
Erling J. Solberg ◽  
Morten Heim ◽  
John E. Stacy ◽  
Kjetill S. Jakobsen ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Alces Alces ◽  
Paternal Age ◽  
Offspring Sex Ratio ◽  
Offspring Sex

Breeding system can affect the offspring sex ratio in Syrian hamsters

2011 ◽  
Vol 45 (1) ◽  
pp. 55-57 ◽  
Author(s):  
M O M Chelini ◽  
N L Souza ◽  
E Otta
Keyword(s):  
Sex Ratio ◽  
Breeding System ◽  
Offspring Sex Ratio ◽  
Syrian Hamsters ◽  
Offspring Sex

scholarly journals Is biasing offspring sex ratio adaptive? A test of Fisher's principle across multiple generations of a wild mammal in a fluctuating environment

2018 ◽  
Vol 285 (1891) ◽  
pp. 20181251 ◽  
Author(s):  
Andrea E. Wishart ◽  
Cory T. Williams ◽  
Andrew G. McAdam ◽  
Stan Boutin ◽  
Ben Dantzer ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrels ◽  
Offspring Sex Ratio ◽  
Offspring Sex ◽  
Adult Sex Ratio ◽  
Secondary Sex Ratio ◽  
North American Red Squirrels ◽  
Negative Frequency Dependent Selection ◽  
Fisher’S Principle

Fisher's principle explains that population sex ratio in sexually reproducing organisms is maintained at 1 : 1 owing to negative frequency-dependent selection, such that individuals of the rare sex realize greater reproductive opportunity than individuals of the more common sex until equilibrium is reached. If biasing offspring sex ratio towards the rare sex is adaptive, individuals that do so should have more grandoffspring. In a wild population of North American red squirrels ( Tamiasciurus hudsonicus ) that experiences fluctuations in resource abundance and population density, we show that overall across 26 years, the secondary sex ratio was 1 : 1; however, stretches of years during which adult sex ratio was biased did not yield offspring sex ratios biased towards the rare sex. Females that had litters biased towards the rare sex did not have more grandoffspring. Critically, the adult sex ratio was not temporally autocorrelated across years, thus the population sex ratio experienced by parents was independent of the population sex ratio experienced by their offspring at their primiparity. Expected fitness benefits of biasing offspring sex ratio may be masked or negated by fluctuating environments across years, which limit the predictive value of the current sex ratio.

Maternal Testosterone and Offspring Sex-Ratio in Birds and Mammals: A Meta-Analysis

2017 ◽  
Vol 45 (1) ◽  
pp. 96-104 ◽  
Author(s):  
Thomas Merkling ◽  
Shinichi Nakagawa ◽  
Malgorzata Lagisz ◽  
Lisa E. Schwanz
Keyword(s):  
Sex Ratio ◽  
Meta Analysis ◽  
Offspring Sex Ratio ◽  
Offspring Sex ◽  
Maternal Testosterone
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