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Titolo:
SEXUAL-BEHAVIOR, SEXUAL SWELLING, AND PENILE EVOLUTION IN CHIMPANZEES(PAN-TROGLODYTES)
Autore:
DIXSON AF; MUNDY NI;
Indirizzi:
UNIV CAMBRIDGE,SUBDEPT ANIM BEHAV,MED RES COUNCIL GRP CAMBRIDGE CB3 8AA ENGLAND CTR INT RECH MED,CTR PRIMATE FRANCEVILLE GABON
Titolo Testata:
Archives of sexual behavior
fascicolo: 3, volume: 23, anno: 1994,
pagine: 267 - 280
SICI:
0004-0002(1994)23:3<267:SSSAPE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMEN CHARACTERISTICS; PRIMATES;
Keywords:
CHIMPANZEE; COPULATORY BEHAVIOR; EVOLUTION; PENIS; VAGINA AND CERVIX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social Sciences Citation Index
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
A.F. Dixson e N.I. Mundy, "SEXUAL-BEHAVIOR, SEXUAL SWELLING, AND PENILE EVOLUTION IN CHIMPANZEES(PAN-TROGLODYTES)", Archives of sexual behavior, 23(3), 1994, pp. 267-280

Abstract

Functional relationships between the penis, vagina, and cervix duringcopulation in the chimpanzee were studied. In 11 adult males, penile length during full erection ranged from 10.0-18.0 cm (xBAR +/- SD = 14.4 +/- 202). In 19 parous adult females examined during the early follicular phase of the cycle, or during lactation, vaginal depth (from the introitus to the os cervix) ranged from 9.8-165 cm (xBAR +/- SD = 12.6 +/- 1.69). However, when the sexual skin was maximally swollen, vaginal depth increased by up to 52% in some cases and ranged from 15.2-20.1 cm (xBAR +/- SD = 169 +/- 1.68). Under such conditions males vary in their ability to achieve maximal depth of intromission. Observations made on 6 females after natural matings revealed that in some cases males had deposited copulatory plugs in contact with the cervix while in others plugs were lower down in the vagina. Direct observations under fluoroscopy using an artificial ''penis'' loaded with radio-opaque medium showed that the filiform tip can make contact with the os cervix. However, expulsion of radio-opaque medium under these conditions failed to demonstrate any immediate transfer of fluid through the cervixinto the uterus. These studies indicate that, aside from its functions as a visual signal, the female chimpanzee's sexual skin swelling adds considerably to the distance males must negotiate during copulation to place spermatozoa at the cervical os. Evolution of the male's elongated, filiform penis may therefore be the result of sexual selection, to negotiate the long vagina of the female and to penetrate copulatoryplugs deposited during previous copulations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 14:16:05