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Titolo:
Arrested development of secondary sexual adornments in subordinate adult male mandrills (Mandrillus sphinx)
Autore:
Setchell, JM; Dixson, AF;
Indirizzi:
Univ Cambridge, Subdept Anim Behav, Cambridge CB3 8AA, England Univ Cambridge Cambridge England CB3 8AA hav, Cambridge CB3 8AA, England Zool Soc San Diego, Ctr Reprod Endangered Species, San Diego, CA 92112 USAZool Soc San Diego San Diego CA USA 92112 pecies, San Diego, CA 92112 USA
Titolo Testata:
AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY
fascicolo: 3, volume: 115, anno: 2001,
pagine: 245 - 252
SICI:
0002-9483(200107)115:3<245:ADOSSA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAPTIVE MALE ORANGUTANS; REPRODUCTIVE TACTICS; TESTICULAR FUNCTION; TESTOSTERONE; SUCCESS; MONKEYS; BABOONS; HORMONE; GABON; SKIN;
Keywords:
socioendocrinology; dominance rank; testosterone; sexual skin; alternative strategies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Setchell, JM Univ Surrey Roehampton, Sch Life Sci, West Hill, London SW15 35N, England Univ Surrey Roehampton West Hill London England SW15 35N and
Citazione:
J.M. Setchell e A.F. Dixson, "Arrested development of secondary sexual adornments in subordinate adult male mandrills (Mandrillus sphinx)", AM J P ANTH, 115(3), 2001, pp. 245-252

Abstract

Previous studies of semifree-ranging mandrills identified two morphological and social variants of the adult male, based on behavioral and secondary sexual characteristics. "Fatted" males are social, with highly developed sex skin coloration, large testes, high plasma testosterone levels, and fat rumps; while "nonfatted" males are peripheral or solitary, with paler sex skin, smaller testes, lower plasma testosterone, and slimmer lumps. We present a detailed study of morphology and group association for 10 adult male mandrills, living in two semifree-ranging groups in Gabon, in order to relatedifferences between males to dominance rank. The results show that rather than existing as two distinct morphotypes, male mandrills represent a continuous spectrum of possibilities between social males with fully developed secondary sexual characteristics, and solitary males with muted secondary sexual characteristics. Alpha males (N = 2) had the highest testosterone levels, the most colorful sex skin, and the mast active sternal glands, and were the only males to spend 100% of their time with the social group. Rank relationships between nonalpha males (N = 8) were not always clear, but all subordinate males had lower testosterone levels and less development of the secondary sexual adornments, and were less group-associated than alpha males. These findings suggest that only alpha males have sufficient testosterone to develop full secondary sexual characteristics, and we propose possiblesocioendocrine mechanisms underlying the suppression of testosterone and secondary sexual development in subordinate adults. We discuss differences in secondary sexual development in relation to reproductive strategies, and discuss the evolution of alternative reproductive morphs in primates. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 09:26:05