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Titolo:
Yolk androgens reduce offspring survival
Autore:
Sockman, KW; Schwabl, H;
Indirizzi:
Washington State Univ, Ctr Reprod Biol, Sch Biol Sci, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 iol Sci, Pullman, WA 99164 USA
Titolo Testata:
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
fascicolo: 1451, volume: 267, anno: 2000,
pagine: 1451 - 1456
SICI:
0962-8452(20000722)267:1451<1451:YAROS>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
KESTREL FALCO-SPARVERIUS; HATCHING ASYNCHRONY; SEXUAL-DIFFERENTIATION; MATERNAL TESTOSTERONE; INTRACLUTCH VARIATION; AMERICAN KESTRELS; CLUTCH SIZE; EGG; GROWTH; BIRDS;
Keywords:
avian brood reduction; Falco sparverius; hatching asynchrony; maternal androgens; parental favouritism; parent-offspring conflict;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Sockman, KW Washington State Univ, Ctr Reprod Biol, Sch Biol Sci, Pullman,WA 99164 USA Washington State Univ Pullman WA USA 99164 lman, WA 99164 USA
Citazione:
K.W. Sockman e H. Schwabl, "Yolk androgens reduce offspring survival", P ROY SOC B, 267(1451), 2000, pp. 1451-1456

Abstract

Females may favour some offspring over others by differential deposition of yolk hormones. In American kestrels (Falco sparverius), we found that yolks of eggs laid late in the sequence of a clutch had more testosterone (T) and androstenedione (A(4)) than yolks of first-laid eggs. To investigate the effects of these yolk androgens on nestling 'fitness', we injected both Tand A(4) into the yolks of first-laid eggs and compared their hatching time, nestling growth and nestling survival with those of first laid eggs in which we injected vehicle as a control. Compared to controls, injection of Tand A, at a dose intended to increase their levels to those of later-laid eggs delayed hatching and reduced nestling growth and survival rates. Yolk androgen treatment of egg 1 had no effect on survival of siblings hatching from subsequently laid eggs. The adverse actions of yolk androgen treatmentin the kestrel are in contrast to the favourable actions of yolk T treatment found previously in canaries (Serinus canaria). 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, such'transgenerational' effects of steroid hormones may have helped to evolutionarily shape the hormonal mechanisms regulating reproduction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 07:04:49