Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Changes in the secondary sexual adornments of male mandrills (Mandrillus sphinx) are associated with gain and loss of alpha status
Autore:
Sotchell, JM; Dixson, AF;
Indirizzi:
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 Univ Cambridge, Subdept Anim Behav, Cambridge CB3 8AA, England Univ Cambridge Cambridge England CB3 8AA hav, Cambridge CB3 8AA, England
Titolo Testata:
HORMONES AND BEHAVIOR
fascicolo: 3, volume: 39, anno: 2001,
pagine: 177 - 184
SICI:
0018-506X(200105)39:3<177:CITSSA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNDERSTANDING DEVELOPMENTAL ARREST; CAPTIVE MALE ORANGUTANS; PLASMA TESTOSTERONE; TESTICULAR FUNCTION; SOCIAL-ENVIRONMENT; MARMOSET MONKEYS; SAGUINUS-OEDIPUS; MALE-DOMINANCE; BEHAVIOR; PARASITES;
Keywords:
Mandrillus sphinx; mandrill; secondary sexual adornments; testis size; testosterone; sexual selection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Sotchell, 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. Sotchell e A.F. Dixson, "Changes in the secondary sexual adornments of male mandrills (Mandrillus sphinx) are associated with gain and loss of alpha status", HORMONE BEH, 39(3), 2001, pp. 177-184

Abstract

Two semifree-ranging mandrill groups, inhabiting large, naturally rainforested enclosures in Gabon, were studied to measure morphological, endocrine,and behavioral changes that occurred when adult males rose, or fell, in dominance rank. Gaining alpha rank (N = 4 males) resulted in increased testicular size and circulating testosterone, reddening of the sexual skin on theface and genitalia, and heightened secretion from the sternal cutaneous gland. Blue sexual skin coloration was unaffected. New alpha males increased in rump "fattedness," but not in body mass, and spent more time associated with other group members, rather than ranging alone. Loss of alpha position(N = 4 males) resulted in less pronounced effects than those that occurredafter males had risen to alpha positions. Deposed alpha males showed decreased testicular volume, decreased body mass, a reduction in the extent of red (but not blue) sexual skin coloration, and decreased sternal gland activity. Deposed males did not decrease in the brightness of sex skin coloration. These results demonstrate that male-male competition and rank reversals have remarkable effects upon testicular function, secondary sexual traits, and behavior in the adult male mandrill. Secondary sexual traits respond tochanges in male social status and therefore may be important as intrasexual signals of dominance rank. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/05/20 alle ore 09:25:49