Seasonal Variation in Body Size and Offspring Sex Ratio in Field Populations of the Parasitoid Wasp, Aphidius ervi (Hymenoptera: Aphidiidae)

Oikos ◽  
1993 ◽  
Vol 68 (2) ◽  
pp. 340 ◽  
Author(s):  
R. Sequeira ◽  
M. MacKauer
Keyword(s):  
Seasonal Variation ◽  
Body Size ◽  
Sex Ratio ◽  
Parasitoid Wasp ◽  
Aphidius Ervi ◽  
Offspring Sex Ratio ◽  
Offspring Sex

scholarly journals Offspring sex ratio shifts of the solitary parasitoid wasp, Trichopria drosophilae (Hymenoptera: Diapriidae), under local mate competition

2018 ◽  
Vol 29 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Jing Li ◽  
Yu Wang ◽  
Cheng-Jie Zhu ◽  
Min Zhang ◽  
Hao-Yuan Hu
Keyword(s):  
Sex Ratio ◽  
Parasitoid Wasp ◽  
Female Offspring ◽  
Mate Competition ◽  
Offspring Sex Ratio ◽  
Pupal Parasitoid ◽  
Offspring Sex ◽  
Local Mate ◽  
Solitary Parasitoid ◽  
Single Foundress

Localmate competition (LMC) models predict a female-biased offspring sex ratio when a single foundress oviposits alone in a patch and an increasing proportion of sons with increasing foundress number. We tested whether the solitary pupal parasitoid, Trichopria drosophilae (Hymenoptera: Diapriidae), adjusted offspring sex ratio with foundress number when parasitizing Drosophila melanogaster pupae. Mean number of female offspring was higher than that of males, with a male proportion of 26 ± 16% when only one foundress oviposited. However, male proportion reached 58 ± 26%, 48 ± 22%, and 51 ± 19% in three-, five and seven-foundress cohorts. That the male proportion of offspring increased with foundress number is consistent with LMC models.

scholarly journals Age-Dependent Constraints of Sex Allocation in a Parasitoid Wasp

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Takatoshi Ueno
Keyword(s):  
Sex Ratio ◽  
Sex Ratios ◽  
Parasitoid Wasp ◽  
Maternal Control ◽  
Offspring Sex Ratio ◽  
Female Age ◽  
Physiological Constraints ◽  
Offspring Sex ◽  
Age Dependent ◽  
Control Failure

The offspring sex ratios of parasitoid wasps often depend on the age of ovipositing females. Physiological constraints such as sperm depletion and senescence are a likely cause. Also, maternal control in response to female age may be an alternative explanation. Here valvifer or abdominal tip movements were used to assess whether age-dependent sex ratio was due to physiological constraints or maternal control with an ichneumonid wasp,Pimpla nipponica; the offspring sex ratio at the time of wasp emergence was compared with the sex ratio predicted from abdominal tip movements. When the female was relatively young, there was little difference between the sex ratios examined. However, as the age of the females increased, the realized offspring sex ratio at wasp emergence was more male-biased than the sex ratio predicted at the time of oviposition. Thus, there was an inconsistency between the sex ratios. Curiously, the predictions of continuous movements for male egg deposition were always perfect, regardless of maternal age; fertilization control failure was detected when the females had decided to lay female eggs. Thus, physiological constraints are a likely explanation for the inconsistency in relation to female age forP. nipponica.

scholarly journals Seasonal Variation in Offspring Sex Ratio in the Snowy Plover

2013 ◽  
Vol 73 (1) ◽  
pp. 60-71 ◽  
Author(s):  
Sarah T. Saalfeld ◽  
Warren C. Conway ◽  
David A. Haukos ◽  
William P. Johnson
Keyword(s):  
Seasonal Variation ◽  
Sex Ratio ◽  
Offspring Sex Ratio ◽  
Offspring Sex ◽  
Snowy Plover

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
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