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Titolo:
Circannual changes in the secondary sexual adornments of semifree-ranging male and female 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 PRIMATOLOGY
fascicolo: 3, volume: 53, anno: 2001,
pagine: 109 - 121
SICI:
0275-2565(200103)53:3<109:CCITSS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACAQUES MACACA-FUSCATA; TESTICULAR FUNCTION; SQUIRREL-MONKEYS; RHESUS MACAQUES; ADULT MALE; MULATTA; TESTOSTERONE; SEASONALITY; SYNCHRONY; ANDROGENS;
Keywords:
mandrill; secondary sexual adornments; sexual selection; reproduction; sexual skin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Setchell, JM Univ Surrey, Sch Life Sci, West Hill, London SW15 35N, England Univ Surrey West Hill London England SW15 35N 5 35N, England
Citazione:
J.M. Setchell e A.F. Dixson, "Circannual changes in the secondary sexual adornments of semifree-ranging male and female mandrills (Mandrillus sphinx)", AM J PRIMAT, 53(3), 2001, pp. 109-121

Abstract

Male mandrills (Mandrillus sphinx) have spectacular secondary sexual adornments. These include red and blue sexual skin on the face, rump, and genitalia; a sternal scent-marking gland; and a "fatted" rump. Mandrills are seasonal breeders, and in other seasonally-breeding primate species members of both sexes may show increased expression of secondary sexual characteristics during the mating season. We examined changes in male secondary sexual adornments and testosterone levels, in relation to seasonal changes in the female reproductive cycle and sexual skin morphology, in two semifree-rangingmandrill groups. Females showed circannual changes in sexual skin tumescence, and periods of tumescence peaked from May-July in a long-established group. However, formation of a second, smaller group, two years previous to commencement of the study, disrupted the seasonal pattern of sexual skin tumescence and births. As the groups occupied adjacent enclosures, it appears that social factors, as well as physical environment, affected the seasonalpatterning of reproduction in females. Male mandrills, by contrast, did not exhibit marked circannual changes in secondary sexual traits. Although adult male testicular volume and circulating testosterone levels increased significantly during the mating season, sexual skin coloration and rump "fattedness" showed no consistent changes with season. There was some evidence to suggest that maturing males (ages 5-8 yr) showed increased development ofred sexual, skin during mating periods, but once males had fully developedsecondary sexual adornments, they remained stable throughout the year. Thepossible reasons for this are discussed in relation to intermale competition and social organization in mandrills. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 22:29:11