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Titolo:
Maternally derived androgens and antioxidants in bird eggs: complementary but opposing effects?
Autore:
Royle, NJ; Surai, PF; Hartley, IR;
Indirizzi:
Univ Lancaster, Sch Biol Sci, Inst Environm & Nat Sci, Lancaster LA1 4YQ, England Univ Lancaster Lancaster England LA1 4YQ Sci, Lancaster LA1 4YQ, England Scottish Agr Coll, Dept Biochem & Nutr, Auchincruive KA6 5HW, Ayr, Scotland Scottish Agr Coll Auchincruive Ayr Scotland KA6 5HW A6 5HW, Ayr, Scotland
Titolo Testata:
BEHAVIORAL ECOLOGY
fascicolo: 4, volume: 12, anno: 2001,
pagine: 381 - 385
SICI:
1045-2249(200107/08)12:4<381:MDAAAI>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLACK-BACKED GULL; PARENTAL INVESTMENT; HATCHING ASYNCHRONY; LARUS-ARGENTATUS; HERRING GULL; ADAPTIVE SIGNIFICANCE; LIPID-PEROXIDATION; CHICK MORTALITY; BROOD REDUCTION; VITAMIN-A;
Keywords:
brood reduction; carotenoids; maternal effects; parental favoritism; sibling competition; testosterone;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Royle, NJ Univ Lancaster, Sch Biol Sci, Inst Environm & Nat Sci, LancasterLA1 4YQ, England Univ Lancaster Lancaster England LA1 4YQ ster LA1 4YQ, England
Citazione:
N.J. Royle et al., "Maternally derived androgens and antioxidants in bird eggs: complementary but opposing effects?", BEH ECOLOGY, 12(4), 2001, pp. 381-385

Abstract

Maternally derived traits, such as within-clutch variation in the amount of testosterone deposited in egg yolks, may have profound effects on offspring fitness. Offspring with elevated levels of testosterone may benefit fromincreased competitive ability through effects on aggression and growth rate. However, elevated levels of testosterone are also associated with costs of increased peroxidative damage from free radicals and consequent oxidative stress. Diet-derived antioxidants, such as vitamin E and various carotenoids, provide protection against the deleterious effects of oxidative stress. Here we show that within-clutch variation in yolk testosterone is the opposite to that of yolk antioxidant concentration in the lesser black-backed gull Larus fuscus. We provide evidence that suggests that these two direct maternal effects are, in fact, 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. The potential implications of these findings with respect to previous investigations on variation in yolk testosterone concentrations and on the understanding of intrafamilial dynamics are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 19:42:41