Brood sex ratio is dependent on female mating status in polygynous great reed warblers

1998 ◽  
Vol 44 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Isao Nishiumi
Keyword(s):  
Sex Ratio ◽  
Mating Status ◽  
Female Mating ◽  
Brood Sex Ratio

scholarly journals Effect of Pheromone Blend Components, Sex Ratio, and Population Size on the Mating of Cadra cautella (Lepidoptera: Pyralidae)

2020 ◽  
Vol 20 (6) ◽  
Author(s):  
Abeysinghe Mudiyanselage Prabodha Sammani ◽  
Dissanayaka Mudiyanselage Saman Kumara Dissanayaka ◽  
Leanage Kanaka Wolly Wijayaratne ◽  
William Robert Morrison
Keyword(s):  
Sex Ratio ◽  
Population Size ◽  
Management Practices ◽  
Mating Disruption ◽  
Current Knowledge ◽  
Mating Status ◽  
Cadra Cautella ◽  
Synthetic Chemicals ◽  
Population Sizes ◽  
Lepidoptera Pyralidae

Abstract The almond moth Cadra cautella (Walker), a key pest of storage facilities, is difficult to manage using synthetic chemicals. Pheromone-based management methods remain a high priority due to advantages over conventional management practices, which typically use insecticides. Cadra cautella females release a blend of pheromone including (Z, E)-9,12-tetradecadienyl acetate (ZETA) and (Z)-9-tetradecadien-1-yl acetate (ZTA). The effect of these components on mating of C. cautella and how response varies with the population density and sex ratio remain unknown. In this study, the mating status of C. cautella was studied inside mating cages under different ratios of ZETA and ZTA diluted in hexane and at different population sizes either with equal or unequal sex ratio. The lowest percentage of mated females (highest mating disruption [MD] effects), corresponding to roughly 12.5%, was produced by a 5:1 and 3.3:1 ratio of ZETA:ZTA. Populations with equal sex ratio showed the lowest percentage of mated females, at 20% and 12.5% under lower and higher density, respectively. The next lowest percentage of mated females was produced when the sex ratio was set to 1: 2 and 2:1 male:female, with just 25% and 22.5% of moths mated, respectively. This study shows that mating status of C. cautella is influenced by ZETA:ZTA ratio, sex ratio, and population size. This current knowledge would have useful implications for mating disruption programs.

Sex-specific costs of rearing a nestling and its implications in the brood sex ratio of Magellanic penguins

2021 ◽  
Vol 168 (8) ◽  
Author(s):  
Melina Barrionuevo ◽  
Valentina Ferretti ◽  
Javier Ciancio ◽  
Esteban Frere
Keyword(s):  
Sex Ratio ◽  
Magellanic Penguins ◽  
Brood Sex Ratio

Sperm Competition and the Dynamics of X Chromosome Drive: Stability and Extinction

Genetics ◽  
2002 ◽  
Vol 160 (4) ◽  
pp. 1721-1731 ◽  
Author(s):  
Jesse E Taylor ◽  
John Jaenike
Keyword(s):  
Sex Ratio ◽  
Sperm Competition ◽  
X Chromosome ◽  
Sex Chromosome ◽  
Basin Of Attraction ◽  
Male Mating ◽  
Male And Female ◽  
Mating Rate ◽  
Female Mating ◽  
Balanced Polymorphism

AbstractSeveral empirical studies of sperm competition in populations polymorphic for a driving X chromosome have revealed that Sex-ratio males (those carrying a driving X) are at a disadvantage relative to Standard males. Because the frequency of the driving X chromosome determines the population-level sex ratio and thus alters male and female mating rates, the evolutionary consequences of sperm competition for sex chromosome meiotic drive are subtle. As the SR allele increases in frequency, the ratio of females to males also increases, causing an increase in the male mating rate and a decrease in the female mating rate. While the former change may exacerbate the disadvantage of Sex-ratio males during sperm competition, the latter change decreases the incidence of sperm competition within the population. We analyze a model of the effects of sperm competition on a driving X chromosome and show that these opposing trends in male and female mating rates can result in two coexisting locally stable equilibria, one corresponding to a balanced polymorphism of the SR and ST alleles and the second to fixation of the ST allele. Stochastic fluctuations of either the population sex ratio or the SR frequency can then drive the population away from the balanced polymorphism and into the basin of attraction for the second equilibrium, resulting in fixation of the SR allele and extinction of the population.

Mixed and Uniform Brood Sex Ratio Strategy in Turtles

2007 ◽  
pp. 279-300
Author(s):  
Jean-Michel Guillon ◽  
Matthew Godfrey ◽  
Marc Girondot ◽  
Vincent Hulin
Keyword(s):  
Sex Ratio ◽  
Brood Sex Ratio

Brood sex ratio in expansive and non-expansive tern species in east-central Poland

Bird Study ◽  
2016 ◽  
Vol 63 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Artur Goławski ◽  
Zbigniew Kasprzykowski ◽  
Mateusz Ledwoń ◽  
Emilia Mróz ◽  
Federico Morelli
Keyword(s):  
Sex Ratio ◽  
East Central ◽  
Central Poland ◽  
Brood Sex Ratio

scholarly journals Brood sex ratio in the Yellow-bellied Prinia (Prinia flaviventris)

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Zhifeng Ding ◽  
Fang Ji ◽  
Qiuli Huang ◽  
Longwu Wang ◽  
Aiwu Jiang ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Brood Sex Ratio ◽  
Prinia Flaviventris
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