Parental condition, brood sex ratio and differential young survival: an experimental study in gulls ( Larus fuscus )

2000 ◽  
Vol 48 (6) ◽  
pp. 452-457 ◽  
Author(s):  
R. G. Nager ◽  
P. Monaghan ◽  
D. C. Houston ◽  
M. Genovart
Keyword(s):  
Experimental Study ◽  
Sex Ratio ◽  
Brood Sex Ratio ◽  
Larus Fuscus ◽  
Parental Condition

Manipulating parental condition affects brood sex ratio, immunocompetence, and early chick mortality in two gull species differing in sexual size dimorphism

The Auk ◽  
2021 ◽  
Author(s):  
Dariusz Bukaciński ◽  
Monika Bukacińska ◽  
Przemysław Chylarecki
Keyword(s):  
Sex Ratio ◽  
Sex Allocation ◽  
Sexual Size Dimorphism ◽  
Egg Laying ◽  
Chick Survival ◽  
Size Dimorphism ◽  
Supplemental Food ◽  
Brood Sex Ratio ◽  
Parental Condition ◽  
Differential Costs

Abstract Sex allocation theory predicts that parents should adjust their brood sex ratio to maximize fitness returns in relation to parental investment. Adaptive adjustment of sex ratio may be driven by differential costs of rearing sons and daughters or differential benefits of investing limited resources into offspring of different sex. In both cases, possible sex ratio bias should depend on parental condition. For sexually dimorphic birds with males larger than females, sons may be less likely to fledge since they are more vulnerable to food shortages or because they have impaired immunocompetence due to higher testosterone levels. Poor condition females should thus overproduce daughters to minimize possible reproductive failure. We manipulated the number of eggs laid and the amount of food available to laying females to induce differences in the condition in 2 gull species differing in sexual size dimorphism. In the Black-headed Gull (Chroicocephalus ridibundus), sexual size differences are marginal; but in the Mew Gull (Larus canus), males are 11% larger. In both species, females forced to lay an additional egg (presumed in worse condition) overproduced daughters, whereas females receiving supplemental food before laying (presumed improved condition) overproduced sons. This sex ratio skew was larger in Mew Gull, a species with larger size dimorphism. Chick immunocompetence at hatching was unrelated to sex, being higher in broods of fed mothers and lower for chicks hatched from last-laid eggs. Chick survival between hatching and day 5 post-hatch was positively related to their immunocompetence, but chicks from last-laid eggs and males of Mew Gull, the more dimorphic species, survived less well. Results indicate that costs of raising larger sex offspring coupled with parental condition shape brood sex ratio in populations studied. Adaptive brood sex ratio adjustment occurs mostly before egg laying and includes differential sex allocation in eggs depending on the probability of producing a fledged chick.

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

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

Brood sex ratio determination by flow cytometry in ants

2003 ◽  
Vol 3 (3) ◽  
pp. 471-475 ◽  
Author(s):  
Serge Aron ◽  
Ludivine De Menten ◽  
Dirk Van Bockstaele
Keyword(s):  
Flow Cytometry ◽  
Sex Ratio ◽  
Brood Sex Ratio ◽  
Ratio Determination

scholarly journals Hatching order and size-dependent mortality in relation to brood sex ratio composition in chinstrap penguins

2006 ◽  
Vol 17 (5) ◽  
pp. 772-778 ◽  
Author(s):  
Juan A. Fargallo ◽  
Vicente Polo ◽  
Liesbeth de Neve ◽  
José Martín ◽  
José A. Dávila ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Size Dependent ◽  
Hatching Order ◽  
Brood Sex Ratio ◽  
Dependent Mortality
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