Determinants of within‐ and among‐clutch variation in levels of maternal hormones in Black‐Headed Gull eggs

@article{Groothuis2002DeterminantsOW,
  title={Determinants of within‐ and among‐clutch variation in levels of maternal hormones in Black‐Headed Gull eggs},
  author={Ton G. G. Groothuis and Hubert Schwabl},
  journal={Functional Ecology},
  year={2002},
  volume={16},
  pages={281-289}
}
1. Females of egg-laying vertebrates may adjust the development of their offspring to prevailing environmental conditions by regulating the deposition of hormones into their eggs. Within- and amng-clutch variation in levels of steroid hormones were studied in the egg yolks of the Black-Headed Gull (Larus ridibundus, Linnaeus) in relation to environmental conditions at the nest site, This species breeds in colonies of different densities and in different habitats, and the chicks hatch… 
Patterns of maternal yolk hormones in eastern screech owl eggs (Megascops asio).
  • D. Hahn
  • Biology
    General and comparative endocrinology
  • 2011
Within-clutch patterns of yolk testosterone vary with the onset of incubation in black-headed gulls
TLDR
It is shown that the increase in yolk testosterone with each successive egg is greater when the mother incubates longer before clutch completion, which is the major determinant of the degree of hatching asynchrony, and suggests that prolactin plays a key role in the adjustment of testosterone allocation to the incubation pattern.
Patterns of within-clutch variation in yolk lutein in the Yellow-legged Gull Larus michahellis: the effects of egg laying order and laying date
TLDR
The hypothesis that the Yellow-legged Gull employs the brood reduction strategy is supported, that said strategy is more drastically applied in late clutches than in early clutches is shown.
Pre‐breeding diet affects the allocation of yolk hormones in zebra finches Taeniopygia guttata
TLDR
Differential yolk androgen allocation within the clutch may alter the competitive differences between chicks and provide females the possibility to adjust reproductive investment and offspring phenotype already at the egg stage.
Yolk androgens and begging behaviour in black-headed gull chicks: an experimental field study
TLDR
The enhancing effect of yolk androgens on growth in this species arises at least partly through androgen-mediated effects on the chicks’ behaviour, which is supported by the hypothesis that this within-clutch variation in maternal androgens mitigates the disadvantage of last-hatched chicks in sibling competition.
Maternal resource variation across the laying sequence in Canada geese Branta canadensis maxima
TLDR
It was found that egg size varied non-linearly across the laying sequence such that first laid eggs were small, the largest eggs in the clutch occurred in the second and third positions, and size declined in eggs laid in subsequent positions.
Sex-specific patterns of yolk androgen allocation depend on maternal diet in the zebra finch
TLDR
The data suggest that there are complex, context-dependent mechanisms of sex-specific androgen allocation in this species, and this species' predicted to adjust their reproductive investment in relation to resource quality.
Age-related patterns of yolk androgen deposition are consistent with adaptive brood reduction in spotless starlings
TLDR
It is suggested that yolk A4 variation may be particularly important at the within-clutch scale, by providing females with a tool to modify nestling hierarchies, as well as increasing the likelihood of brood reduction when environmental conditions became hardest.
...
...

References

SHOWING 1-10 OF 40 REFERENCES
Maternal androgens in black-headed gull (Larus ridibundus) eggs: consequences for chick development
We tested the hypothesis that mother birds counterbalance the negative effects of hatching asynchrony for later–hatched chicks by increasing the yolk androgen concentrations in consecutive eggs of
Yolk is a source of maternal testosterone for developing birds.
  • H. Schwabl
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1993
TLDR
These findings indicate that female songbirds can bestow upon their eggs a dose of hormone that modifies the behavior of offspring, suggesting that variable doses of these hormones might explain some of the individual variation in offspring behavior.
Maternal testosterone in tree swallow eggs varies with female aggression
TLDR
In tree swallows, Tachycineta bicolor, it is found that yolk testosterone was correlated with the aggressive interactions of the female before and during egg laying and did not vary with laying order in tree swallow.
Maternal testosterone in the avian egg enhances postnatal growth.
  • H. Schwabl
  • Biology
    Comparative biochemistry and physiology. Part A, Physiology
  • 1996
Yolk androgens reduce offspring survival
TLDR
Additional studies are necessary in order to determine whether the deposition of yolk androgens is an adaptive form of parental favouritism or an adverse by–product of endocrine processes during egg formation, despite its adaptive significance.
Maternal steroids and contaminants in common tern eggs: a mechanism of endocrine disruption?
Intraclutch Variation in Testosterone Content of Red-Winged Blackbird Eggs
TLDR
The evolution of reproductive patterns in waterfowl and environmental influence on life-history traits: Growth, survival, and fecundity in Black Brant is studied.
Maternally derived yolk testosterone enhances the development of the hatching muscle in the red-winged blackbird Agelaius phoeniceus
  • J. Lipar, E. Ketterson
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2000
TLDR
It is found that both yolk testosterone concentration and relative complexus mass (complexus mass/nestling body mass) increased with laying order and that these two variables were positively correlated in both newly hatched nestlings and in two–day–old broods.
Maternally derived androgens and antioxidants in bird eggs: complementary but opposing effects?
TLDR
It is shown that within-clutch variation in yolk testosterone is the opposite to that of yolk antioxidant concentration in the lesser black-backed gull Larus fuscus, and evidence is provided that these two direct maternal effects are complementary and, in conjunction with an indirect maternal effect (the onset of incubation), may provide an adaptive mechanism for parental favoritism in response to environmental variability.
EFFECTS OF PARENTAL AGE ON HATCHING ASYNCHRONY, EGG SIZE AND THIRD-CHICK DISADVANTAGE IN WESTERN GULLS
We examined the relationships among parental age, hatching asynchrony, egg size, and the "third-chick disadvantage" of Western Gulls (Larus occidentalis) on Southeast Farallon Island, California,
...
...